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911 Never Forget

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911 Never Forget

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Glossary

A
Term/Acronym	Definition
ADR	Alternative Dispute Resolution
ADU	Adjusted Daily Usage
AEIC	Association of Edison Illuminating Companies
AGC	Automatic Generation Control
AML	Adjusted Metered Load
AMR	Adjusted Metered Resource
AMS	Advanced Metering System
AP	Adjustment Period
API	Automated Programmatic Interface
AS	Ancillary Services
ATC	Area Transmission Constraints
Adjusted Metered Load	Retail Load usage data that has been adjusted for UFE and transmission and/or distribution losses.
Adjustment Period	The Adjustment Period for any given Operating Hour is the time period following the close of the Day-Ahead market and extending up to each Operating Period.
Advanced Meter	Any new or appropriately retrofitted meter that functions as part of an Advanced Metering System and deployed pursuant to P.U.C. SUBST. R. 25.130, Advanced Metering.
Advanced Metering System (AMS)	A system, including Advanced Meters and the associated hardware, software, and communications devices, that collects time-differentiated energy usage and is deployed pursuant to P.U.C. SUBST. R. 25.130.
Advisory	The second of four possible levels of communication issued by ERCOT in anticipation of a possible emergency condition detailed in Section 5.6.
Affiliate	An Entity who directly or indirectly owns or holds at least five percent of the voting securities of another Entity; or An Entity in a chain of successive ownership of at least five percent of the voting securities of another Entity; or An Entity that has at least five percent of its voting securities owned or controlled, directly or indirectly, by another Entity; or An Entity that has at least five percent of its voting securities owned or controlled, directly or indirectly, by an Entity who directly or indirectly owns or controls at least five percent of the voting securities of another Entity or an Entity in a chain of successive ownership of at least five percent of the voting securities of another Entity; or A person who is an officer or director of another entity or of a corporation in a chain of successive ownership of at least five percent of the voting securities of an Entity; or An Entity that actually exercises substantial influence or control over the policies and actions of another Entity; or Any other Entity determined by the PUCT to be an Affiliate.
Aggregated Retail Load Data	Adjusted Metered Load that has been aggregated as defined in Section 11.5.1, Aggregate Retail Load Data.
Aggregated Unit	A single plant or facility containing two or more individual generation units that require tandem operation for optimal performance (e.g. a combined cycle plant) which ERCOT has agreed to treat as a single unit for settlement purposes only as set forth in Protocols Section 6.8.2.4, Aggregating Units.
Agreement	Standard form Agreement executed between ERCOT and Market Participants.
Alternative Dispute Resolution	Procedures, outlined in Section 20 of these Protocols, for settling disputes by means other than litigation.
Ancillary Service Obligations	See Obligations
Ancillary Service Supply	See Supply
Ancillary Services	Those services, described in Section 6, necessary to support the transmission of energy from Resources to Loads while maintaining reliable operation of transmission provider's transmission systems in accordance with Good Utility Practice.
Ancillary Services Plan	ERCOT produced plan, as described in Section 6, Ancillary Services, that identifies the types and amount of Ancillary Services necessary for each hour of the next day, or next two (2) days, to operate the ERCOT Transmission Grid reliably in accordance with Operating Guides, and which includes the allocation of types and amounts of the Ancillary Services Obligations for each QSE.
Annual Transmission Planning Report	A report prepared at least annually by ERCOT, as required by the PUCT rules, regarding the status of the ERCOT System including identification of ERCOT System existing and potential Congestion, which includes identification of current and recommended construction of Transmission Facilities.
Authorized Representative	The person(s) designated by an Entity during the registration process in Section 16, Registration and Qualification of Market Participants, who is responsible for authorizing all registration information required by ERCOT Protocols and ERCOT business processes, including any changes in the future, and will be the contact person(s) between the registered Entity and ERCOT for all business matters requiring authorization by ERCOT.
Automatic Voltage Regulator	A device used on Generation Resources to automatically maintain a voltage set point.
Availability Plan	An hourly representation of availability of RMR, Synchronous Condenser and/or Black Start Resources submitted to ERCOT by Entities with RMR, Synchronous Condenser and/or Black Start Resources by 0600 in the Day Ahead Period.
Average Daily Usage	The ratio of the total consumption divided by the number of days the consumption covered. (ADU = Monthly kWh/# of days).
B
Term/Acronym	Definition
BLT	Block Load Transfer
Balanced Schedule	An Energy and Ancillary Service schedule submitted to ERCOT by a Qualified Scheduling Entity that consists of projected interval Obligations and projected interval Supply, and that includes Qualified Scheduling Entity Obligations for Transmission and Distribution Losses. A Balanced Schedule must have aggregate Supply equal to aggregate Obligations, by Settlement Interval.
Balancing Energy	Balancing Energy represents the change in zonal energy output or demand determined by ERCOT to be needed to ensure secure operation of ERCOT Transmission Grid, and supplied by the ERCOT through deployment of bid Resources to meet Load variations not covered by Regulation Service.
Bankrupt	The condition of an Entity when such Entity (i) files a petition or otherwise commences a proceeding under any bankruptcy, insolvency, reorganization or similar law, or has any such petition filed or commenced against it, (ii) makes an assignment or any general arrangement for the benefit of creditors, (iii) has a liquidator, administrator, receiver, trustee, conservator or similar official appointed with respect to it or any substantial portion of its property or assets, or (iv) is generally unable to pay its debts as they fall due.
BES-Capable Off-line Non-Spinning Reserve Service (Off-line BESCNSRS)	A service that is provided through utilization of generation capacity capable of being synchronized and ramped to a specific output level within fifteen (15) minutes that is also capable of providing Balancing Energy Service or Load that is capable of providing Balancing Energy Service, and that is not participating in any other activity, including ERCOT markets, self-generation and other energy transactions. Resources will be allowed to provide this service as determined by ERCOT. Any Resource desiring to provide this service must be approved by ERCOT before such service can be offered.
BES-Capable On-line Non-Spinning Reserve Service (On-line BESCNSRS)	A service that is provided through utilization of On-line generation capacity capable of being ramped to a specific output level within fifteen (15) minutes that is also capable of providing Balancing Energy Service. Resources will be allowed to provide this service as determined by ERCOT. Any Resource desiring to provide this service must be approved by ERCOT before such service can be offered.
Bid Stack	Bids received for Ancillary Services organized from lowest price to highest price bid for the same service and time interval.
Black Start Resource	A single Resource capable of providing Black Start Service.
Black Start Service	A contracted Ancillary Service acquired by ERCOT for the benefit of all Loads, provided by Resource capable of starting without support of the ERCOT Transmission Grid.
Block Load Transfer	A transfer scheme which isolates a group of loads from the Control Area in which they normally are served and subsequently interconnects them with an adjacent Control Area. Such transfer schemes involve either transferring loads normally in ERCOT to a Non-ERCOT Control Area or transferring loads normally in Non-ERCOT Control Areas to the ERCOT Control Area. Block Load Transfers specifically exclude transfers of load between ERCOT and Non-ERCOT Control Areas that occur behind a retail settlement meter.
Boundary Geration Resources	Those Resources, identified prior to ERCOT’s annual TCR auction, on a unit-specific basis, that are related to a combination of CSC and CRE, and whose impacts on the CRE are opposite to those on the related CSC.
Business Day	Monday through Friday, excluding observed holidays listed below: New Year's Day Good Friday Memorial Day Independence Day Labor Day Thanksgiving Thursday and Friday Two (2) days at Christmas, as designated by the ERCOT CEO Bank Business Day Any day during which the United States Federal Reserve Bank of New York is open for normal business activity. Retail Business Day Same as above except in the case of retail transactions processed by a TDSP, CRs shall substitute TDSP holidays for ERCOT holidays when determining the time available to the TDSP to process the transaction. For additional, important information related to Retail Business Days, please refer to the Retail Market Guide.
Business Hours	8:00 A.M. to 5:00 P.M. Central Prevailing Time on Business Days.
C
Term/Acronym	Definition
CR	Competitive Retailer
CRE	Closely Related Elements
CSA	Continuous Service Agreement
CSC	Commercially Significant Constraint
Current Operating Plan	See Ancillary Services Plan
Customer Premise	See Premise.
Capital Asset	An asset expected to have a useful life of at least twelve (12) months that is not bought or sold in the normal course of business.
Capital Expenditure	An outlay of money to acquire a Capital Asset or extend the useful life of an existing Capital Asset for at least twelve (12) months.
Central Prevailing Time	Either Central Standard Time or Central daylight time as established by national time standards.
Certificate of Compliance	A certificate issued by ERCOT stating that the Metering Facilities referred to in the certificate satisfy the certification criteria for Metering Facilities contained in these Protocols.
Check Meter	A redundant revenue quality meter, which produces equal or better accuracy than the primary revenue quality meter, connected at the same metering point, which must be certified in accordance with the ERCOT Protocols.
Closely Related Elements (CREs)	Those transmission facilities that have shift factor impacts similar to those associated with a particular Commercially Significant Constraint (CSC), and for which there exists a limited amount of Boundary Generation Resources between it and the particular CSC, so that the zonal deployment of Balancing Energy Service is effective in mitigating Zonal Congestion.
Comision Federal de Electricidad (CFE)	The state-owned federal commission of electricity of Mexico. The government agency in Mexico charged with the responsibility of operating the Mexican national electricity grid (outside Mexico City).
Commercial Model	Transmission model developed by ERCOT that arranges groups of Generation Resource and Load busses into Congestion Zones that have similar impacts on Commercially Significant Constraints.
Commercially Significant Constraint (CSC)	A constraint in the ERCOT Transmission Grid that is found, through the process described in Section 7, to result in Congestion which limits the free flow of energy within the ERCOT market to a commercially significant degree.
Commercially Significant Constraint (CSC) Limit	The maximum power flow across a CSC allowed to maintain reliable operation.
Competitive Retailer (CR)	Municipally Owned Utility or an Electric Cooperative that offers Customer Choice and sells electric energy at retail in the restructured electric power market in Texas; or a Retail Electric Provider (REP) as defined in 25.5 of the PUCT Substantive rules.
Compliance Premium	A Compliance Premium is awarded by the program administrator in conjunction with a Renewable Energy Credit (REC) that is generated by a renewable energy source that is not powered by wind and meets the criteria of subsection (m) of P.U.C. SUBST. R. 25.173, Goal for Renewable Energy. For the purpose of the renewable energy portfolio standard requirements, one Compliance Premium is equal to one REC.
Congestion	The situation that exists when requests for power transfers across a Transmission Facility element or set of elements, when netted, exceed the transfer capability of such elements.
Congestion Zone	A grouping of busses that create a similar Shift Factor on CSCs.
Continuous Service Agreement (CSA)	An arrangement between the owner or controller of a leased Premise and a CR wherein the CR provides service to the leased Premise between tenants so that the Premise does not experience discontinuation of electric service during vacancy.
Control Area	An electrical system, bound by interconnect (tie line) metering and telemetry, which continuously regulates, through automatic generation control, its generation and interchange schedules to match its system Load, regulates frequency, and meets all applicable Control Area requirements.
Control Area Operator	An individual or set of individuals responsible for monitoring and control operation of the Control Area.
CR of Record	See Competitive Retailer
Current System Conditions	The Real-Time status of the ERCOT System, which may affect ERCOT's operational decisions.
Customer	An Entity that purchases electricity for its own consumption.
Customer Choice	The freedom of a retail Customer to purchase electric services, either individually or on an aggregated basis with other retail Customers, from the provider or providers of the Customer's choice and to choose among various fuel types, energy efficiency programs, and renewable power suppliers.
Customer Choice Pilot	A project used to allow the PUCT to evaluate the implementation of Customer Choice as provided in PURA 39.104.
Customer Registration Database	The database maintained by the Registration Agent containing information identifying each Premise, including current and previous Competitive Retailers serving the Premise.
D
Term/Acronym	Definition
DA	Day Ahead
DAS	Data Aggregation System
DC	Direct current
DLF	Distribution Loss Factor
DRG	Distributed Renewable Generation
DSG	Dynamically Scheduled Generation
DSL	Dynamically Scheduled Load
DUNS #	DUNS Number
Data Aggregation	The process of netting, grouping and summing Load consumption data, applying appropriate profiles, Transmission Loss Factors, and Distribution Loss Factors and calculating and allocating UFE to determine each QSE and/or Load Serving Entities responsibility by Settlement Interval by Congestion Zone and by other prescribed aggregation determinants.
Data Aggregation System	The database and communication system that will collect meter data from TDSPs and directly polled meters in ERCOT. The system will perform aggregation functions to the Load data in order to satisfy certain objectives such as providing TDSPs with Load share data to use in billing Competitive Retailers, assigning QSE Load responsibility, and assisting Competitive Retailers and QSEs in their settlement responsibilities. The data will also be compiled along Congestion and weather zones.
Data Archive	An integrated normalized data structure of all the target source systems' transactions. The population of the data archive will be an extraction of data from the transaction systems without transforming the data. The Data Archive will be used to populate the Data Warehouse.
Data Warehouse	De-normalized data stored in a schema, physically optimized to handle high volumes of data and concurrent user access, and is generally lightly indexed.
Day Ahead	The twenty-four (24) hour period prior to the beginning of the Operating Day.
Delivery Plan	A plan by ERCOT containing the hours and levels of operation that an RMR Unit, including Synchronous Condenser Unit, is instructed to operate.
Demand	Instantaneous or integrated power consumption
Direct Current Tie, DC Tie	Any non-synchronous transmission interconnections between ERCOT and non-ERCOT electric power systems.
Direct Load Control	Controlling select end-use equipment (e.g. A/C, water heaters) for purposes of reducing energy consumption during select periods.
Dispatch	The act of issuing Dispatch Instructions.
Dispatch Instruction(s)	Specific command(s) issued by ERCOT to QSEs or TDSPs during the course of operating the ERCOT System.
Distribution Loss Factor	The ratio of the Distribution Service Provider's estimated Distribution Losses to the total amount of energy deemed consumed (IDR plus profiled consumption) on the Distribution Service Provider's system.
Distribution Losses	The difference between the energy delivered to the Distribution System and the energy consumed by Loads connected to the Distribution System.
Distribution Service Provider	An Entity that owns and maintains a Distribution System for the delivery of energy from the ERCOT Transmission Grid to the Customer.
Distribution System	That portion of an electric delivery system operating at under 60 kilovolts (kV) that provides electric service to Customers or Wholesale Customers.
DUNS Number	A unique nine-digit common company identifier used in electronic commerce transactions.
Dynamic Schedule	A Real Time telemetered signal to ERCOT derived from an actual metered Load that represents an energy Obligation and Resource in a QSE schedule, as further described in Section 4, Scheduling.
E
Term/Acronym	Definition
EDI	Electronic Data Interchange
EEA	Energy Emergency Alert
EILS	Emergency Interruptible Load Service
EMS	Energy Management System
EPS	ERCOT Polled Settlement Meter
ERCOT	Electric Reliability Council of Texas
ERO	Electric Reliability Organization
ESI ID	Electric Service Identifier
EILS Contract Period	A time frame during which ERCOT may procure EILS in an amount no greater than 1000 MW. Unless otherwise announced by ERCOT at least ninety (90) days prior to the start of an EILS Contract Period, the standing EILS Contract Periods are February through May, June through September, and October through January.
EILS Resource	A Load that is contracted to provide EILS.
EILS Self-Provision	The act by a QSE to meet its Load Ratio Share (LRS) of the total EILS procurement by designating Load to act as an EILS Resource. The EILS Resource self-providing EILS bids its Load at a price of zero (0) dollars.
Electric Cooperative	A corporation organized under Chapter 161, Texas Utilities Code, or a predecessor statute to Chapter 161 and operating under that chapter; A corporation organized as an electric cooperative in a state other than Texas that has obtained a certificate of authority to conduct affairs in the State of Texas; or A successor to an electronic cooperative created before June 1, 1999, in accordance with a conversion plan approved by a vote of the members of the electric cooperative, regardless of whether the successor later purchases, acquires, merges with, or consolidates with other electric cooperatives.
Electric Reliability Council of Texas, Inc. (ERCOT)	A Texas nonprofit corporation that has been certified by the PUCT as the Independent Organization, as defined in �39.151 of PURA, for the ERCOT Region.
Electric Reliability Organization (ERO)	The organization approved by the FERC to perform the electric reliability organization functions described in the Electricity Modernization Act of 2005 (16 U.S.C. �824 et seq.).
Electric Service Identifier (ESI ID)	The basic identifier assigned to each Service Delivery Point used in the registration and settlement systems managed by ERCOT or another Independent Organization.
Eligible Transmission Service Customer	A Transmission and/or Distribution Service Provider (for all uses of its Transmission System) or any electric utility, municipally owned utility, Electric Cooperative, Power Generation Company, Competitive Retailer, Retail Electric Provider, federal power marketing agency, exempt wholesale generator, qualifying facility, power marketer, or other person whom the Public Utility Commission of Texas has determined to be an Eligible Transmission Service Customer.
Emergency Condition	That operating condition where the safety or reliability of the ERCOT System is compromised or threatened, as determined by ERCOT.
Emergency Interruptible Load Service (EILS)	A special emergency service used during an EEA Level 2B to reduce Load and assist in maintaining or restoring ERCOT System frequency.
Emergency Notice	The fourth of four possible levels of communication issued by ERCOT in anticipation of a possible Emergency Condition detailed in Section 5.6.
Emergency Short Supply	The condition wherein ERCOT experiences an insufficient amount of bids in any Ancillary Services market, as described in Section 6.
Energy Emergency Alert (EEA)	An orderly, predetermined procedure for maximizing use of available Resources and, only if necessary, curtailing Demand during electric system emergencies while providing for the maximum possible continuity of service and maintaining the integrity of the ERCOT System.
Energy Obligations	See Obligations
Energy Ratio Share	A QSE’s ratio of Adjusted Metered Load plus Settlement Meter energy output from Uncontrollable Renewable Resources electing to utilize Renewable Production Potential for URC and OOME to total ERCOT Adjusted Metered Load plus Settlement Meter energy output from Uncontrollable Renewable Resources electing to utilize Renewable Production Potential for URC and OOME related to the appropriate interval.
Energy Supply	See Supply
Engineering Studies	Studies performed by ERCOT for the purpose of studying, evaluating, or planning of the ERCOT System.
Entity	Any natural person, partnership, municipal corporation, cooperative corporation, association, governmental subdivision, or public or private organization.
ERCOT Board	The Board of Directors of the Electric Reliability Council of Texas.
ERCOT CEO	ERCOT Chief Executive Officer
ERCOT Member	Any member of ERCOT that is a member in good standing in accordance with the ERCOT Bylaws.
ERCOT Metered Entity	Any one of the following entities that meets the requirements of Section 10.2.3, ERCOT Polled Settlement Meters: Any Generation connected directly to the transmission system; Any Generation equal to or over 10MW; Any Generation participating in any ancillary service market; Non-opt-in Cooperatives and Municipality points of delivery over 10MW; or Direct-Current ties (or interchanges with other control areas outside of ERCOT). Additionally ERCOT will directly poll any generator or non-opt-in utility metering point at the request of the entity if the entity meets all requirements and certifications associated with EPS metering.
ERCOT Polled Settlement (EPS) Meter	Any meter polled by ERCOT as defined in Section 10 for use in the financial settlement of the Market.
ERCOT Region	The geographic area under the jurisdiction of the PUCT that is served by TDSPs that are not synchronously interconnected with electric utilities outside the state of Texas.
ERCOT Service Fee Schedule	Schedule of fees charged by ERCOT for various services provided to designated Entities, in accordance with these Protocols and/or as approved by the ERCOT Board, and as posted on the MIS.
ERCOT System	The interconnected combination of generation, transmission, and distribution components in the ERCOT Region.
ERCOT System Load	The sum of all HVDC interconnections and Generation Resources metered at the point of its interconnection with the ERCOT System at any given point in time.
ERCOT Transmission Grid	All of those Transmission Facilities which are within the ERCOT Region.
F
Term/Acronym	Definition
FERC	Federal Energy Regulatory Commission
FTP	FTP File Transfer Protocol
Facilities	Equipment situated for the purpose of conducting service and/or business through use of the ERCOT System.
Final Day-Ahead Schedule	Those schedules ERCOT deems valid following the close of the Day Ahead period.
Final Statement	See Settlement Statement
Financing Persons	The lenders, security holders, investors, partners, multilateral institutions, and others providing financing or refinancing for the business of Entity, including development, construction, ownership, operation and/or maintenance of a Facility or any portion thereof, or any trustee or agent acting on behalf of any of the foregoing.
Force Majeur Event	Any event beyond the reasonable control of, and that occurs without the fault or negligence of, the Entity whose performance is prevented by the occurrence of such event. Examples of such a Force Majeure Event include, but are not limited, to: an act of God, labor disturbance, act of the public enemy, war, insurrection, riot, fire, storm or flood, explosion, breakage or accident to machinery or equipment, or a curtailment, order, regulation or restriction imposed by governmental, military, or lawfully established civilian authorities.
Forced Derate	For a Generation Resource, a failure that requires immediate removal (either through controlled or un-controlled actions) of a portion of the capacity of the Resource from service through automated or manual means. The portion of the Resource removed from service must exceed two-percent (2%) of its prior High Sustainable Limit (HSL) for Generation Resources larger than 500 MW and ten-percent (10%) of its prior HSL for Generation Resources smaller than 500 MW. For Qualified Scheduling Entities (QSEs) representing Wind-powered Generation Resources (WGRs), the loss of a portion of the capacity shall be due to the unavailability of a portion of the equipment and shall not include capacity changes due to changes in the weather. For QSEs representing WGRs, the percentage calculation will be determined using the generating unit’s maximum net power.
Frequency Bias of Portfolio	A positive (+) value, in megawatts per 0.1Hz, to represent response of a QSE's Resources to a deviation in frequency from scheduled frequency.
Fuel Index	An electronically-published index that reflects the price of fuel as determined by a fuel industry organization using available market information.
Fuel Oil Price (FOP)	The Market Participant may use either of the following two fuel oil index prices: (1) Gulf Coast No. 2 The sum of five cents plus the average of the Platts Oilgram Price Report for U.S. Gulf Coast, pipeline No. 2 oil, converted to dollars per million British thermal units ($/MMBtu). The conversion is 0.1385 MMBtu per gallon. The Platts Oilgram Price Report indicates which Operating Days the prices are effective. For Saturdays, Sundays, holidays, and other days for which Platts Oilgram Price Report does not publish an effective price, the effective price shall be the effective price for the Operating Day following the holiday or day without a published price. In the event, at the time of settlement or calculation of generic costs, that the effective price for a particular Operating Day is not available, the effective price for the most recent preceding Operating Day shall be used. (2) Ultra Low Sulfur (ULS) Diesel #2 The sum of five cents plus the average of the Platts Oilgram Price Report for ULS Diesel #2, converted to dollars per million British thermal units ($/MMBtu). The conversion is 0.1385 MMBtu per gallon. The Platts Oilgram Price Report indicates which Operating Days the prices are effective. For Saturdays, Sundays, holidays, and other days for which Platts Oilgram Price Report does not publish an effective price, the effective price shall be the effective price for the Operating Day following the holiday or day without a published price. In the event, at the time of settlement or caluculation of generic costs, that the effective price for a particular Operating Day is not available, the effective price for the most recent preceding Operating Day shall be used.
G
Term/Acronym	Definition
GSU	Generator Step Up
Generation Entity	Owner or controller of a Generation Resource used for generating electricity and electrically connected to the ERCOT System.
Generation Resources	Facilities that produce energy and that are owned or operated by a Generation Entity.
Good Utility Practice	Any of the practices, methods, and acts engaged in or approved by a significant portion of the electric industry during the relevant time period, or any of the practices, methods, and acts that, in the exercise of reasonable judgment in light of the facts known at the time the decision was made, could have been expected to accomplish the desired result at a reasonable cost consistent with good business practices, reliability, safety, and expedition. Good utility practice is not intended to be limited to the optimum practice, method, or act, to the exclusion of all others, but rather is intended to include acceptable practices, methods, and acts generally accepted in the region.
Governmental Authority	Any Federal, state, local or municipal body having jurisdiction over a Market Participant or ERCOT; provided, however, a Governmental Authority who is also a Market Participant shall not exercise its jurisdiction in any matter that involves the interests of that Market Participant where that matter also involves the interests or responsibilities of any other Market Participant or ERCOT, unless the matter is one in which the Market Participant has exclusive jurisdiction.
Governor	The electronic, digital, or mechanical device that implements Primary Frequency Response of a Generation Resource.
Gross Generation	The generated output power at the terminals of the generator.
H
Term/Acronym	Definition
HSL	High Sustainable Limit
HVDC	High Voltage Direct Current
High Operating Limit (HOL)	The maximum net dependable capability of a Resource that may be delivered for a period of up to one hour.
High Sustainable Limit (HSL)	The maximum net capability of a Resource that may be delivered for an indefinite period.
I
Term/Acronym	Definition
IDR	Interval Data Recorder
IOU	Investor Owned Utilities
IPP	Independent Power Producers
IDR Data Threshold	The percentage of IDR data by MRE that must be available before ERCOT will calculate a True-Up Settlement as set forth in Protocols Section 9.2.6, True-Up Statement.
IDR Mandatory Installation Threshold	The kW (kVA) level at which the installation of interval data recorders are required for settlement purposes as set forth in Protocols Section 18.6.1, Interval Data Recorder Installation and Use in Settlement.
IDR Optional Removal Threshold	The kW (kVA) level at which an interval data recorder may be removed as set forth in Section 18.6.7, IDR Optional Removal Threshold.
Inadvertent Energy Account	An account maintained by ERCOT to track any differences between deemed meter readings at the DC Ties, based on schedules, and the actual metered values at the DC Tie meters.
Initial Settlement	See Settlement Statement
Inter-QSE Trade	Any Energy and Ancillary Services scheduled to or from other QSEs or ERCOT.
Interconnection Agreement	An agreement that sets forth requirements for physical connection between an Eligible Transmission Service Customer and Transmission and/or Distribution Service Providers.
Interval Data Recorder (IDR)	Metering Device that is capable of recording Load usage in each Settlement Interval in accordance with Section 9, Settlement and Section 10, Metering
Invoice	Settlement Invoice A notice for payment or credit due rendered by ERCOT based on data contained in Initial, Final, True-Up or any Resettlement Statements. TCR Invoice An invoice issued to a successful bidder based on a final round of a TCR auction.
Invoice Recipient	Market Participants that receive an Invoice from ERCOT.
J
Term/Acronym	Definition
K
Term/Acronym	Definition
KWH	Kilowatt Hour
L
Term/Acronym	Definition
LSE	Load Serving Entity
Late Payment	Payments due to ERCOT by Invoice Recipients that are not received by the due date and time.
Load	The amount of electric power delivered at any specified point or points on a system.
Load Profile	A representation of the energy usage of a group of Customers, showing the demand variation on an hourly or sub-hourly basis.
Load Profile Type	A classification of a group of Customers having similar energy usage patterns and that are assigned the same Load Profile.
Load Profiling	The set of processes used for the development and creation of Load Profiles.
Load Profiling Methodology	The fundamental basis on which Load Profiles are created. The implementation of a Load Profiling Methodology may require statistical sampling, engineering methods, econometric modeling, or other approaches.
Load Ratio Share	A QSE's ratio of Adjusted Metered Load to total ERCOT Adjusted Metered Load related to the appropriate interval.
Load Serving Entity	An Entity that provides electric service to Customers and Wholesale Customers. Load Serving Entities include Retail Electric Providers, Competitive Retailers, and Non-Opt In Entities that serve Load.
Local Congestion	Any Congestion that cannot be resolved by deployment of Balancing Energy Service by Congestion Zone. Local Congestion will include those actions, and related costs, associated with mitigating overloads on CSCs or CREs beyond that which can be accomplished by the zonal deployment of BES.
Location Code	The code representing the physical location of a Premise.
Low Operating Limit (LOL)	The minimum net capability of a Resource that may be delivered for a period of up to one hour.
Low Sustainable Limit (LSL)	The minimum net capability of a Resource that may be delivered for an indefinite period.
M
Term/Acronym	Definition
MCP	Market Clearing Price
MCPC	Market Clearing Price for Capacity
MCPE	Market Clearing Price for Energy
MDAS	Meter Data Acquisition System
MOU	Municipally Owned Utility
MP	Market Participant
MVAR	Megavolt Ampere Reactive
Maintenance Outage	See Outage
Market Clearing Price for Capacity	The highest price associated with a Congestion Zone for a Settlement Interval for Ancillary Service capacity awarded in each Ancillary Services capacity procurement run by ERCOT. There will be a separate Market Clearing Price for Capacity for each Ancillary Services capacity market.
Market Clearing Price for Energy	The highest price associated with a Congestion Zone for a Settlement Interval for Balancing Energy deployed during the Settlement Interval.
Market Implementation Plan	Plan developed by ERCOT that addresses training, testing, qualification, and registration of Market Participants for participation in the Customer Choice Pilot, as well as the conversion to single Control Area operations.
Market Information System (MIS)	An electronic communications interface established and maintained by ERCOT that provides a communications link to Market Participants, including secure access by and communications to individual Market Participants regarding information linked to each individual Market Participant.
Market Participant	An Entity that engages in any activity that is in whole or in part the subject of these Protocols, regardless of whether such Entity has executed an Agreement with ERCOT.
Market Segment	The Segments defined in Article 2 of the ERCOT Bylaws. The segments are: Independent REPs, Independent Generators, Independent Power Marketers, Investor Owned Utilities, Municipals, Cooperatives, and Consumers.
Mass Drop	The immediate cessation of service by a CR to all ESI IDs served by the CR.
Mass Transition	The transition of Electric Service Identifiers from one Competitive Retailer to a POLR or designated CR, or from one Transmission and/or Distribution Service Provider to another TDSP, in quantity, or within a timeframe, identified by Applicable Legal Authority.
Merit Order	The ranking of Resources as a direct function of the monetary bid from those resources.
Messaging System	The ERCOT-to-QSE communications system used to send Real-Time notices and Dispatch Instructions to the QSEs.
Meter Data Acquisition System	The system to obtain revenue quality meter data from ERCOT Polled Settlement meters and Settlement Quality Meter Data from the TDSP for settlement and to populate the Meter Data Aggregation System and ERCOT Data Archive.
Meter Data Exchange Format	The format for submitting meter data to, or receiving data from, ERCOT Settlement Agent.
Meter Data Request Format	The format for requesting Settlement Quality Meter Data from the ERCOT Settlement Agent.
Meter Reading Entity (MRE)	An Entity that is responsible for providing ERCOT with ESI ID level consumption data as defined in Texas SET and Protocols Section 19. This Entity must be a TDSP that is registered with ERCOT as prescribed in Protocols Section 10. In the case of an ERCOT Polled Settlement (EPS) Meter or ERCOT populated ESI ID data (such as generation site load), ERCOT will be identified as the MRE in ERCOT systems.
Metering Facilities	Revenue Quality Meters, instrument transformers, secondary circuitry, secondary devices, meter data servers, related communication Facilities and other related local equipment intended to supply ERCOT settlement quality data.
Mismatched Schedule Processing Fee	The fee charged to a QSE that fails to correct a mismatched schedule in a timely manner.
Mothballed Generation Resource	A Generation Resource for which a Generation Entity has submitted a Notification of Suspension of Operations, for which ERCOT has declined to execute an RMR Agreement, and for which the Generation Entity has not announced retirement of the Generation Resource.
Move-In Request	A request submitted by a CR on behalf of a Customer to initiate service at a Premise with the requesting CR.
Move-Out Request	A request submitted by a CR on behalf of a Customer to terminate service at a Premise with the requesting CR.
Municipally Owned Utility	A utility owned, operated, and controlled by a municipality or by a nonprofit corporation, the directors of which are appointed by one or more municipalities.
Must-Run Alternative (MRA) Agreement	The contractual arrangement between ERCOT and a MRA Resource.
Must-Run Alternative (MRA) Resource	A Resource that was selected through the planning process pursuant to Section 6.5.9.2, Exit Strategy from an RMR Agreement to provide steady-state or dynamic voltage support, stability or management of localized transmission constraints under first contingency criteria, as described in the Operating Guides, at a lower cost than an RMR Agreement.
N
Term/Acronym	Definition
NERC	North American Electric Reliability Corporation
NOIE	Non Opt-In Entity
NSRS	Non-Spinning Reserve Service
Net Dependable Capability	Maximum sustainable capability of a Generation Resource as demonstrated by performance testing.
Net Generation	Gross generation minus station auxiliaries or other internal unit power requirements metered at or adjusted to the point of interconnection at the Common Switchyard.
New Renewable Facilities	Renewable energy generators placed in service on or after September 1, 1999. A New Facility includes the incremental capacity and associated energy from an existing Renewable Facility through repowering activities undertaken on or after September 1, 1999.
Non-Metered Load	Load that is not required to be metered by applicable distribution or transmission tariff.
Non-Opt In Entity (NOIE)	An Electric Cooperative or Municipally Owned Utility that does not offer Customer Choice.
Non-Spinning Reserve Service (NSRS)	A service that is comprised of 30-Minute Non-Spinning Reserve Service (30MNSRS) and BES-Capable Non-Spinning Reserve Service (BESCNSRS). 30-Minute Non-Spinning Reserve Service (30MNSRS) A service that is provided through utilization of the portion of Off-line generation capacity capable of being synchronized and ramped to a specified output level within thirty (30) minutes (or Load that is capable of being interrupted within thirty (30) minutes) and that is capable of running (or being interrupted) at a specified output level for at least one (1) hour. 30MNSRS is not capable of participating in the Balancing Energy Services market because it does not meet all of the qualifications of providing Balancing Energy Service Up within fifteen (15) minutes.
North American Electric Reliability Corporation	The national organization that is responsible for establishing standards and policies for reliable electric system operations and planning, or its successor.
Notice or Notification	Sending of information by an Entity to Market Participants, ERCOT, or others, as called for in these Protocols. Notice or notification may be sent by electronic mail, facsimile transmission, or U.S. mail.
NOx Emissions Allowance Index Price (NOxEAIP)	The average of the bid/ask price for Nitrogen Oxide (NOx) emissions allowances in dollars per allowance, published for each Operating Day. The NOxEAIP will be obtained by ERCOT and will be based on daily index prices selected by ERCOT that are generally accepted in the industry and regularly published. ERCOT will disclose to Market Participants the source of its selected NOxEAIP, along with descriptions of the nature and derivation of the index as available from the publisher of the index. In the event that an ERCOT-selected index becomes unavailable or unsuitable for the intended purpose, ERCOT will select a substitute index source. ERCOT will notify Market Participants of any change in the index, along with a description of the nature and derivation of the substitute index and a summary of the reasons for the change, at least thirty (30) days prior to the beginning of its use. However, in the event that thirty (30) days’ notice cannot be given for any reason, ERCOT will notify Market Participants as far prior to use as practical. The NOxEAIP for Saturdays, Sundays, holidays and other days for which there is no index published shall be based on the next published index after the Operating Day. In the event that the index is not published for more than two (2) days, the previous day published index will be used for the next applicable settlement and the next day published index will be used for true-up of the Final Statement.
O
Term/Acronym	Definition
OCN	Operating Condition Notice
OOM	Out of Merit Order
OOMC	Out of Merit Capacity
OOME	Out of Merit Energy
Obligation	Total Obligations scheduled by a QSE that are comprised of energy Obligations and Ancillary Services Obligations where: Energy Obligations = Load + losses + energy sales + energy exports; and Ancillary Services Obligations = ERCOT allocated Ancillary Services Obligations (which may be self-arranged) + Ancillary Services sales (to ERCOT or to other QSEs)
Off-line	The status of Resources that are not synchronously interconnected to the ERCOT System.
On-line	Resources that are synchronously interconnected to the ERCOT System.
Operating Condition Notice	The first of four possible levels of communication issued by ERCOT in anticipation of a possible emergency condition detailed in Section 5.6, Emergency and Short Supply Operation.
Operating Day	The actual day, including hours ending 0100 to 2400, during which energy is flowing.
Operating Guides	Guidelines approved by the ERCOT Board describing the reliability standards for ERCOT.
Operating Hour	The current clock hour.
Operating Period	A two-hour period comprised of the Operating Hour and the hour preceding the Operating Hour.
Operating Plan	A plan developed by ERCOT to operate the ERCOT System in Real Time.
Operational Constraint	Anticipated or actual security violation or overload of a transmission element, based on actual network topology.
Operational Model	The transmission model based on actual network topology of the ERCOT System.
Out of Merit Capacity	Capacity provided by a Resource selected by ERCOT outside the bidding process to resolve a reliability or security event.
Out of Merit Energy	Energy provided by a Resource selected by ERCOT outside the bidding process to resolve a reliability or security event.
Out of Merit Order (OOM)	The selection of Resources for Ancillary Services that would otherwise not be selected to operate because of their place (or absence) in the bidding process for that service.
Outage	Removal of a Facility, or a portion of a Facility, from service to perform maintenance, construction or repair on the Facility for a specified duration. Forced Outage For a Transmission Facility, an Outage initiated by protective relay, or manually in response to an observation by personnel or the System Operator that the condition of equipment could lead to an event, or potential event, that poses a threat to people, equipment, or public safety. For a Generation Resource, an Outage that requires immediate removal (either through controlled or un-controlled actions) of a Resource from service through automated or manual means. This type of Outage usually results from immediate mechanical/electrical/hydraulic control system trips and operator-initiated actions in response to a Resource’s condition. Maintenance Outage Removing Transmission Facility or Resource Facility equipment from service to perform work on specific Facility components that could be postponed briefly. Such work is required to prevent a potential Forced Outage or Forced Derate and cannot be postponed until the next Planned Outage. Such Maintenance Outages are classified as follows: Level 1 Maintenance Outage – Equipment that must be removed from service within twenty-four (24) hours to prevent a potential Forced Outage or Forced Derate; Level II Maintenance Outage – Equipment that must be removed from service within seven (7) days to prevent a potential Forced Outage or Forced Derate; and Level III Maintenance Outage – Equipment that must be removed from service within thirty (30) days to prevent a potential Forced Outage or Forced Derate. Planned Outage Any major or minor Transmission Facility or Resource Facility equipment Outage, other than a defined Maintenance Outage, that is planned and scheduled in advance as submitted to ERCOT.
P
Term/Acronym	Definition
PM	Power Marketer
POI	Point of Interconnection
POLR	Provider of Last Resort
POS	Power Operating System
PRR	Protocol Revision Request
PUCT	Public Utility Commission of Texas
PURA	Public Utility Regulatory Act, Title II, Texas Utility Code
PURPA	Public Utility Regulatory Policy Act
PhotoVoltaic	Of or pertaining to a material or device in which electricity is generated as a result of exposure to light.
Physical Responsive Capability (PRC)	A representation of the total amount of system wide online capability that has a high probability of being able to quickly respond to system disturbances. The PRC shall be calculated by (i) determining each Resource meeting the requirements defined in the Operating Guides, (ii) determining for each Resource the lesser quantity of the latest Net Dependable Capability, the Resource Plan High Operating Limit (HOL), or the telemetered Real Time capability, (iii) multiplying the lesser quantity of each Resource by the Reserve Discount Factor (RDF), (iv) using that result to determine the amount of responsive reserve capability then available on each Resource, and (v) the sum, for all Resources, of the responsive reserve capability as determined for each Resource. The PRC shall be used by ERCOT to determine the appropriate Emergency Notification and Energy Emergency Alert (EEA) levels.
Point of Interconnection (POI)	The location(s) where a Generation Entity’s interconnection Facilities connect to the Transmission Facilities as reflected in the Standard Generation Interconnection Agreement (SGIA) between a Generation Entity and a TDSP.
Postage Stamp Allocation	The pro rata allocation of charges (or payments), which spreads to designated, Entities based on a pro rata share (of actual or estimated consumption).
Power Generation Company	An Entity registered by the PUCT that: (1) generates electricity that is intended to be sold at wholesale; (2) does not own a transmission or distribution Facility in this state other than an essential interconnecting Facility, a Facility not dedicated to public use, or a Facility otherwise excluded from the PURA definition of “electric utility;” and (3) does not have a certificated service area, although its affiliated electric utility or transmission and distribution utility may have a certificated service area.
Power Marketer	An Entity that: Becomes an owner or controller of electric energy in this state for the purpose of buying and selling the electric energy at wholesale; Does not own generation, transmission, or distribution Facilities in this state; Does not have a certificated service area; and Has been granted authority by the Federal Energy Regulatory Commission to sell electric energy at market-based rates or has registered as a power marketer.
Pre-assigned Congestion Rights (PCRs)	Congestion Rights allocated prior to the annual TCR auctions to MOUs and ECs which own or have a long-term (greater than five years) contractual commitments, entered into prior to September 1, 1999, for annual capacity and energy from a specific remote Generation Resource.
Premise	A Service Delivery Point or combination of Service Delivery Points that are assigned a single Electric Service Identifier (ESI ID) for purposes of settlement and registration.
Price-to-Beat	The bundled rate a Retail Electric Provider that is affiliated with an Entity required to unbundle its electric services, and offer Customer Choice, must charge to residential and small commercial Customers upon initiation of Customer Choice, as further described in Section 39.202 of PURA and PUCT rules.
Primary Frequency Response	The instantaneous proportional increase or decrease in real power output provided by a Generation Resource and the natural real power dampening response provided by load in response to system frequency deviations. This response is in the direction that stabilizes frequency.
Primary Meter	The ERCOT approved, revenue-quality meter connected at an ERCOT approved interconnection point.
Prior Agreement	Any previous agreement between an Entity, its Affiliate(s) or its predecessor(s) in interest and ERCOT regarding performance under the ERCOT Protocols.
Private Use Network	An electric network connected to the ERCOT Transmission Grid that contains load that is not directly metered by ERCOT (i.e., load that is typically netted with internal generation).
Profile Type	See Load Profile Class
Program Administrator	The Entity approved by the PUCT that is responsible for carrying out the administrative responsibilities related to the Renewable Energy Credit Programs as set forth in subsection (g) of P.U.C. SUBST. R. 25.173, Goal for Renewable Energy.
Proposal for Installation	A written proposal submitted by an Entity to ERCOT describing a proposal for the installation of additional Metering Facilities.
Proprietary Customer Information	Any information compiled by a Market Participant on a Customer in the normal course of Market Participant's business that makes possible the identification of any individual Customer by matching such information with the Customer's name, address, account number, type of classification service, historical electricity usage, expected patterns of use, types of Facilities used in providing service, individual contract terms and conditions, price, current charges, billing records, or any other information that a Customer has expressly requested not be disclosed. Information that is redacted or organized in such a way as to make it impossible to identify the Customer to whom the information relates does not constitute Proprietary Customer Information.
Protected Information	That information protected from disclosure as described in Section 1, Overview.
Protocol Implementation Plan	Plan developed by ERCOT that identifies any known differences between the ERCOT market operations system, power operations system, and settlement systems and these Protocols, and specifies a plan to conform such systems to these Protocols.
Provider of Last Resort (POLR)	The designated Competitive Retailer as defined in the PUCT Substantive Rules for default Customer service, and as further described in Section 15.1, Customer Switch of Competitive Retailer.
Q
Term/Acronym	Definition
QSE	Qualified Scheduling Entity
QSE Operator	The person designated by the QSE to communicate with ERCOT on a 24-hour basis.
Qualified Scheduling Entity	A Market Participant that is qualified by ERCOT in accordance with Section 16, Qualification of Qualified Scheduling Entities and Registration of Market Participants, to submit Balanced Schedules and Ancillary Services bids and settle payments with ERCOT.
Qualifying Facility	A qualifying cogenerator or qualifying small power producer according to regulatory qualification criteria as defined in PURA.
Quick Start Unit	Generation units that are not On-line, but are capable of producing energy within the next Settlement Interval.
R
Term/Acronym	Definition
RAP	Remedial Action Plan
REC	Renewable Energy Credit
REP	Retail Electric Provider
RGS	Regulation Service
RMR	Reliability Must-Run
RPRS	Replacement Reserve Service
RRO	Responsive Reserve Obligation
RRS	Responsive Reserve Service
RT	Real Time
RTPP	Real Time Production Potential
Reactive Power	The product of voltage and the out-of-phase component of alternating current. Reactive Power, usually measured in megavolt-amperes reactive, is produced by capacitors, overexcited generators and other capacitive devices and is absorbed by reactors, underexcited generators and other inductive devices.
Reactive Power Profile	See Voltage Profile
Reactive Reserve	That reactive capability required to meet sudden loss of generation, Load or transmission capacity and maintain voltage within desired limits.
Real Time	The current instant in time.
Real Time Production Potential	A Real Time signal sent to ERCOT by each Wind-powered Generation Resource (WGR) providing the WGR’s reasonable efforts estimate of the net production available in MW from the WGR given the existing wind conditions at the time and given all available individual wind generation turbines not on Planned or Forced Outage. The RTPP shall not be the actual meter reading of the WGR; it is an estimate using the same process when the WGR is curtailed as when it is not curtailed. The RTPP is a calculated value based on Real Time data averaged for not more than ten (10) seconds. RTPP is the product of wind speed, the turbine manufacturer’s power curve, turbine availability and loss factors. Other factors may be applied with the approval of ERCOT.
Registered Market Participant	Entity that is registered with ERCOT to participate in the competitive market administered by ERCOT within the ERCOT Region. Registered Market Participants include those using statewide systems administered by ERCOT and may be non-ERCOT participants.
Registration Processing Period	Minimum amount of time the ERCOT registration system requires to process transactions. This period begins when ERCOT receives a registration transaction request and continues until the completion of the transaction.
Regulation Service	A service that is used to control the power output of Generation Resources in response to a change in system frequency so as to maintain the target system frequency within predetermined limits.
Reliability Must Run (RMR) Service	The provision of generation capacity and/or energy resources from Reliability Must Run Unit or a Synchronous Condenser Unit.
Reliability Must Run (RMR) Unit	A Generation Resource unit operated under the terms of an Agreement with ERCOT that would not otherwise be operated except that they are necessary to provide voltage support, stability or management of localized transmission constraints under first contingency criteria.
Remedial Action Plan	Predetermined operator actions to maintain ERCOT Transmission Grid reliability during a defined adverse operating condition.
Renewable Energy Credit (REC)	A Renewable Energy Credit (REC) is a tradable instrument that represents all of the renewable attributes associated with one (1) MWh of production from a certified renewable generator.
Renewable Energy Credit (REC) Account	An account maintained by ERCOT for the purpose of tracking the production, sale, transfer, purchase, and retirement of RECs or Compliance Premiums by a REC Account.
Renewable Energy Credit (REC) Account Holder	An Entity registered with ERCOT to participate in the REC Trading Program.
Renewable Energy Credit (REC) Trading Program	The REC Trading Program, as described in Section 14, State of Texas Renewable Energy Credit Trading Program, and P.U.C. SUBST. R. 25.173, Goal for Renewable Energy.
Renewable Portfolio Standard (RPS)	The amount of capacity required to meet the requirements of PURA �39.904 pursuant to subsection (h) of P.U.C. SUBST. R. 25.173, Goal for Renewable Energy.
Renewable Production Potential	The maximum generation in MWh/interval from an Uncontrollable Renewable Resource that could be generated from all available units of such Resource. The Renewable Production Potential depends on the renewable energy that can be generated from the available units (wind or solar radiation) and the energy conversion characteristics of each unit. The Renewable Production Potential will be determined from data submitted in accordance with procedures established by ERCOT.
Replacement Reserve Service	A service that is procured from Generation Resource units planned to be off-line and Load acting as a Resource that are available for interruption during the period of requirement.
Representative Interval Data Recorder	The technique for profiling premises participating in special pricing programs which consists of implementing a statistically representative Load research sample on the program population. The sample data is then used to develop the representative IDR (RIDR) for profiling these premises.
Reserve Discount Factor (RDF)	A representation of the average amount of system wide capability that, for whatever reason, is historically undeliverable during periods of high system demand. The RDF will be verified by ERCOT and then approved by the ROS.
Resettlement Statement	See Settlement Statement
Resource	Facilities or Load capable of providing or reducing the need for electrical energy or providing Ancillary Services to the ERCOT System, as described in Section 6, Ancillary Services. This includes Generation Resources and Loads acting as Resources.
Resource Category Generic Fuel Cost (RCGFC)	A standard $/MWh cost for fuel specific to one of eight resource categories (Nuclear, Hydro, Coal and Lignite, Combined Cycle, Simple Cycle, Gas Steam, Diesel and Non-Hydro Renewable).
Resource Category Generic Operational Cost	A standard $/MWh price for running a unit selected out of merit order to provide balancing energy. The RCGOC is defined by the generation unit category (Base-load, Gas Intermediate, Gas Cyclic, Gas Peaking and Renewable).
Resource Category Generic Startup Cost	A fixed price for starting a unit that is selected out of merit order to provide balancing energy. The RCGSC is defined by the generation unit category (Base-load, Gas Intermediate, Gas Cyclic, Gas Peaking and Renewable).
Resource Entity	A Market Participant that owns or controls a Resource.
Resource ID	A unique identifier assigned to each Resource used in the registration and settlements systems managed by ERCOT.
Resource Minimum Down Time	The minimum time from shutdown of a Resource required until that Resource can be restarted and available to the ERCOT market.
Resource Plan	A plan provided by a QSE to ERCOT indicating the forecast state of Generation Resources or individual Loads each acting as a Resource, including information on availability, limits and forecast generation or Load of each Resource.
Responsibility Transfer	The controlled and orderly transfer of eligible resources from one QSE to another in accordance with Section 4, Scheduling.
Responsive Reserve Service	Responsive Reserve consists of the daily operating reserves that are intended to help restore the frequency of the interconnected transmission system within the first few minutes of an event that causes a significant deviation from the standard frequency.
Retail Business Day	See Business Day
Retail Business Hour	Any hour within a Retail Business Day.
Retail Electric Provider	A person that sells electric energy to retail Customers in this state. As provided in PURA �31.002(17), a Retail Electric Provider may not own or operate generation assets. As provided in PURA �39.353(b), a Retail Electric Provider is not an Aggregator.
Retail Entity	Municipally Owned Utilities (MOUs), generation and transmission cooperatives, and distribution cooperatives that offer customer choice; Retail Electric Providers (REPs); and Investor Owned Utilities (IOUs) that have not unbundled pursuant to PURA �39.051.
Revenue Quality Meter	For ERCOT Metered Entities, a meter that is in compliance with the Protocols and the Operating Guides. For TDSP Metered Entities, a meter that is in compliance with Local Regulatory Authority approved meter standards or the Protocols and the Operating Guides.
S
Term/Acronym	Definition
SCADA	Supervisory Control And Data Acquisition
SCE	Schedule Control Error
SET	Standard Electronic Transaction
SGIA	Standard Generation Interconnection Agreement
SPP	Southwest Power Pool
STWPF	Short-Term Wind Power Forecast
Sample Design	The processes by which ERCOT determines the appropriate requirements for a sample of Customer Premises which requirements will be used to create a Load Profile.
Sample Size	The number of data points (i.e. Customer Premises) in a particular sample.
Sampling	The process of selecting a subset of a population of Customers that statistically represents the entire population.
Schedule Control Error	The difference in the QSE's actual Resource output and its base power schedule plus instructed Ancillary Services.
Scheduling Process	The process through which schedules for energy and Ancillary Services are submitted by QSEs to ERCOT as further described in Section 4, Scheduling.
Season	Winter months are December, January, and February; Spring months are March, April, and May; Summer months are June, July, and August; Fall months are September, October, and November.
Segmentation	The process of dividing a population into a number of sub-sets, according to certain parameters, for the purpose of creating Load Profiles for sub-sets of the population.
Segmentation Parameter	The parameter chosen as the basis for Segmentation.
Self-Arranged Ancillary Service	Resources used for Ancillary Services designated by a QSE for use by ERCOT for meeting the ERCOT allocated portion of the Ancillary Services Obligations of a QSE. These Resources may not be included in the ERCOT Ancillary Services market.
Service Address	The street address associated with an ESI-ID as recorded in the Registration Database. This address shall conform to United States Postal Service Publication 28.
Service Delivery Point	The specific point on the TDSP's system where electricity flows from the TDSP to a Load.
Service Fee Schedule	A listing of ERCOT fees and charges to Market Participants, posted on the Market Information System.
Service Filing	A filing by a QSE to ERCOT as part of the QSE's certification process, as defined in Section 16, Qualification of Qualified Scheduling Entities and Registration of Market Participants.
Settlement Calendar	As defined in Section 9.1.2, Settlement Calendar.
Settlement Interval	The time period for which a Market Service is deployed and financially settled. For example, the currently defined settlement interval for the Balancing Energy Market Service is 15 minutes.
Settlement Invoice	See Invoice
Settlement Meter	Generation and end-use consumption meters used for allocation of ERCOT charges and wholesale and retail settlements.
Settlement Quality Meter Data	Data that has been edited, validated, and is appropriate for ERCOT Settlement Agent to use for settlement and billing purposes.
Settlement Statement	A statement issued by ERCOT reflecting a breakdown of administrative, miscellaneous, and market charges for the applicable Market Services, as further described in Section 9.2, Settlement Statements. Initial Statement The first iteration of a Settlement Statement issued for a particular Operating Day, as further described in Section 9.2.3, Initial Statements. Final Statement The statement issued at the end of the fifty-ninth (59th) calendar day following the Operating Day, as described in 9.2.4, Final Statements. Resettlement Statement The statement using corrected settlement data, in accordance with Section 9.2.5, Resettlement Statement. True-Up Statement The statement issued six (6) months following the Operating Day, as further described in Section 9.2.6, True-Up Statement.
Shadow Price	The cost of an operation to effect a one (1) MW change in a constraint.
Shift Factor	A measure of the flow of a unit injection of the power on the transmission element from a particular bus to a fixed reference bus. Site Specific Shift Factor The actual Shift Factor for a particular bus. Zonal Shift Factor The average Shift Factor for all busses in a particular zone.
Short-Term Wind Power Forecast (STWPF)	An ERCOT produced, hourly, fifty percent (50%) probability of exceedence forecast of the generation in MWh per hour from each WGR that could be generated from all available units of that Resource.
Sign/Direction Terminology Conventions for Reactive Power	Generator Lagging power factor operating condition is when volt-ampere reactive (VAR) flow is out of the Generation Resource unit (overexcited generator) and into the transmission system and is considered to be positive (+) flow, i.e., in the same direction as megawatt power flow. The generator is producing megavolt-amperes reactive. Leading power factor operating condition means that VAR flow is into the Generation Resource unit (underexcited generator) and out of the transmission system and is considered to be negative (-) flow, i.e., in the opposite direction as megawatt power flow. The generator is absorbing megavolt-amperes reactive. Transmission Line Terminal VAR flow out of the bus and into the line is considered to be positive (+) flow. VAR flow into the bus and out of the line is considered to be negative (-) flow. Capacitor Produces reactive power (VAR source) for voltage control and causes the system power factor to move towards a leading condition. Reactor Absorbs reactive power (VAR sink) for voltage control and causes the system power factor to move towards a lagging condition.
Startup Loading Failure	An event that results when a Generation Resource is unable to be at Low Sustainable Limit (LSL) at the time scheduled in the Resource Plan which occurs while the unit is ramping up to its scheduled MW output. A Startup Loading Failure ends when the Resource: (1) achieves its LSL; (2) is scheduled to go Off-line; or (3) enters a Forced Outage.
Supply	Total supply scheduled by a QSE that is comprised of Energy Supply and Ancillary Services Supply where: Energy Supply = Resources + energy purchases + energy imports; and Ancillary Services Supply = Resources + Ancillary Services purchases (including purchases through ERCOT) + Ancillary Services imports
Switch Request	A request submitted by a CR on behalf of a Customer to switch service from the Customer's current CR to the requesting CR.
Switchable Resource	A Generation Resource that can be connected to either the ERCOT Transmission Grid or a grid outside the ERCOT Region.
Synchronous Condenser Unit	A unit operated under the terms of an annual Agreement with ERCOT that is only capable of supplying Volt Amperes Reactive (VAR) that would not otherwise be operated except that it is necessary to provide voltage support under first contingency criteria.
System Benefit Fund	The fund established by the PUCT to provide funding for Customer education programs, programs to assist low-income electric Customers; and the property tax replacement mechanism provided by Section 39.601 of PURA.
System Congestion Fund	ERCOT's accounting fund from which payments for resolving Congestion are disbursed and to which ERCOT credits Congestion-related receipts from QSE's representing Loads.
System Operator	An Entity supervising the collective Transmission Facilities of a power region that is charged with coordination of market transactions, system-wide transmission planning, and network reliability.
T
Term/Acronym	Definition
T&D Losses	Losses Transmission Losses & Distribution Losses
TAC	Technical Advisory Committee
TCOS	Transmission Cost of Service
TCR	Transmission Congestion Right
TDSP	Transmission and/or Distribution Service Provider
TEWPF	Total ERCOT Wind Power Forecast
TLF	Transmission Loss Factor
TMOS	Transmission Market Operations Subcommittee
TOU	Time Of Use
TOUS	Time Of Use Schedule
TRE	Texas Regional Entity
TSP	Transmission Service Provider
TTC	Total Transmission Capacity
TUOS	Transmission Use of Service
TX SET	Texas Standard Electronic Transaction
TCR Interface	The CSC for which Transmission Congestion Rights are auctioned and awarded.
TCR Invoice	See Invoice
TDSP Metered Entity	Any Entity that meets the requirements of Section 10.2.2, TDSP Metered Entities.
Technical Advisory Committee	A subcommittee in the ERCOT governance structure reporting to the Board of Directors as defined by the ERCOT bylaws.
Texas Regional Entity (TRE)	The organization approved by the Electric Reliability Organization and the FERC to perform the regional Entity functions for the ERCOT Region described in the Electricity Modernization Act of 2005 (16 U.S.C. �824 et seq.).
Texas SET	Texas Standard Electronic Transaction procedures, set forth in Section 19, Texas SET, used to transmit information pertaining to the Customer Registration Database. Record and Data Element Definitions are provided in the data dictionary in Protocols Section 19.
Time of Use Metering	A programmable electronic device capable of measuring and recording electric energy in pre-specified time periods. For Load Profiling purposes Time of Use Metering does not include IDRs.
Time of Use Schedule	A schedule identifying the Time of Use period associated with each Settlement Interval. These schedules may include on-peak, off-peak, and shoulder periods.
Total Energy Obligation	The total energy Obligation for a Qualified Scheduling Entity during a Settlement Interval, including the energy from the Balanced Schedule and integrated energy of instructed Ancillary Services.
Total Transmission Capacity	The maximum power that may be transferred across a transmission corridor while maintaining reliability of the ERCOT System.
Transaction Clearinghouse	A batch, transactional interface intended to provide reliable exchange of high volume, standardized transactions between Market Participants and ERCOT using the Texas SET procedures in Section 19, Texas SET.
Translation Factor	The monthly ratio of the aggregate Competitive Retailer's four (4) coincident peak demand over the monthly aggregate Competitive Retailer's coincident peak demand, as further described in Section 9.8, Transmission Billing Determinant Calculation.
Transmission Access Service	Use of the TDSP's Transmission Facilities for which the TDSP is allowed to charge for the use through tariff rates approved by the PUCT.
Transmission and/or Distribution Service Provider (TDSP)	An Entity that owns or operates for compensation in this state equipment or Facilities to transmit and/or distribute electricity, and whose rates for Transmission Service, distribution service, or both is set by a Governmental Authority.
Transmission and/or Distribution Service Provider (TDSP)	An Entity that owns or operates for compensation in this state, equipment or Facilities to transmit and/or distribute electricity, and whose rates for Transmission Service, distribution service, or both is set by a Governmental Authority or an Entity that was selected to own and operate Transmission Facilities listed in the Public Utility Commission of Texas (PUCT) Order in Docket No. 35665, Commission Staff’s Petition for the Selection of Entities Responsible for Transmission Improvements Necessary to Deliver Renewable Energy from Competitive Renewable Energy Zones, which has a code of conduct approved by the PUCT.
Transmission Billing Determinants	Key parameters and formula components required by a TDSP in determining the billing charges for the use of its Transmission Facilities and/or distribution Facilities.
Transmission Congestion Right (TCR)	A financial hedge against the cost of 1 MW flowing across a particular Commercially Significant Constraint, in a single direction, for 1 hour.
Transmission Congestion Right Account Holder (TCR Account Holder)	A Registered Market Participant that is qualified to bid for and own TCRs in ERCOT's annual or monthly auctions, or that has acquired such rights in secondary markets for purposes of participating in ERCOT's financial settlements for Congestion Credits. [A TCR Account Holder is a Registered Market Participant whose record of ownership appears in ERCOT’s databases of auction results or financial settlements for Zonal Congestion Credits].
Transmission Facilities	The following Facilities are deemed to be Transmission Facilities: Power lines, substation, and associated Facilities, operated at 60 kV or above, including radial lines operated at or above 60 kV. Substation Facilities on the high side of the transformer, in a substation where power is transformed from a voltage higher than 60 kV to a voltage lower than 60 kV or is transformed from a voltage lower than 60 kV to a voltage higher than 60 kV. The direct current interconnections with the Southwest Power Pool (SPP), Western System Coordinating Council (WSCC), Comision Federal de Electricidad, or other interconnections.
Transmission Loss Factors	The fraction of ERCOT Load (forecast or actual) that is considered to constitute the ERCOT Transmission Grid losses in the Settlement Interval. Transmission Loss Factors are computed by ERCOT and are based on a linear interpolation (extrapolation) of the calculated losses in the off-peak and on-peak seasonal ERCOT base cases.
Transmission Losses	Difference between energy input into the ERCOT Transmission Grid and the energy taken out of the ERCOT Transmission Grid.
Transmission Service	Commercial use of Transmission Facilities.
Transmission Service Provider	An Entity under the jurisdiction of the PUCT that owns or operates Transmission Facilities used for the transmission of electricity and provides transmission service in the ERCOT Transmission Grid.
True-Up Statement	See Settlement Statement
Two-Day Ahead	The twenty-four (24) hour period beginning the instant after 2400 forty-eight (48) hours before the Operating Day.
U
Term/Acronym	Definition
UFE	Unaccounted For Energy
URL	Unit Reactive Limit
USTR	Uninitiated Service Termination Request
Unaccounted for Energy (UFE)	The difference between total metered Load each Settlement Period, adjusted for applicable Distribution Losses and Transmission Losses, and total ERCOT System net generation.
Uncontrollable Renewable Resources	Generators that can only produce an amount of energy directly related to their supply of variable energy from their respective renewable resources, such as wind or solar.
Uninstructed Deviation	A condition occurring whenever the total metered resources of a QSE for a Settlement Interval are different from the total of the scheduled resources plus any Resource deployments instructed by ERCOT.
Uninstructed Factor	A factor used to reduce the total payments made to a Resource for Uninstructed Deviations. The Uninstructed Factor could change by interval, in accordance with Section 6.8.1.14.2, Determining the Uninstructed Factor.
Unusual Event	Specifics events, as defined in these Protocols Section 4, Scheduling, that allow ERCOT to deploy Balancing Energy Service outside of the normal deployment notification.
Uplift	The process of allocating costs to QSEs based on Loads and exports within the ERCOT Region.
Usage Profile	See Load Profile
V
Term/Acronym	Definition
Va.m.M	Vector Absolute Megawatt-Mile
Va.m.O	Vector Absolute Megawatt Ohm
VEE	Validation, Editing and Estimation of meter data
VSA	Voltage Security Analysis
VSS	Voltage Support Service
VT	Voltage Transformer
Validation, Editing, Estimation of Meter Data	See Section 11, Metering
Virtual QSE	An LSE whose QSE has provided notice of its intent to terminate its relationship with the LSE and who then fails to meet ERCOT's creditworthiness requirements to become an Emergency QSE, as set forth in Section 16.2.13.1, Designation as an Emergency QSE or Virtual QSE.
Voltage Profile	A predetermined distribution of desired nominal voltage set points across the ERCOT System.
Voltage Support Service	A service that is required to maintain transmission and distribution voltages on the ERCOT Transmission Grid within acceptable limits.
W
Term/Acronym	Definition
WGR	Wind-powered Generation Resource
WGRPP	Wind-powered Generation Resource Production Potential
WSCC	Western System Coordinating Council
WSIDR	Weather-Sensitive Interval Data Recorder
Watch	The third of four possible levels of communication issued by ERCOT in anticipation of a possible emergency condition detailed in Section 5.6, Emergency and Short Supply Operation.
Weather Zone	A geographic region in which climatological characteristics are similar for all areas within such region.
Wholesale Customers	Non-Opt-in entities receiving service at wholesale points of delivery from an LSE other than themselves.
Wind-powered Generation Resource (WGR)	A Generation Resource that is powered by wind. Wind turbines may be aggregated together to form a WGR if each turbine is the same model and size and located behind the same Generator Step Up (GSU) transformer.
Wind-powered Generation Resource Production Potential (WGRPP)	The generation in MWh per hour from a WGR that could be generated from all available units of that Resource allocated from the eighty-percent (80%) probability of exceedance of the Total ERCOT Wind Power Forecast.
X
Term/Acronym	Definition
XML	Extensible Markup Language
Y
Term/Acronym	Definition
Z
Term/Acronym	Definition
Zonal Congestion	Congestion on CSCs or CREs that can be resolved by zonal deployment of Balancing Energy Services and RPRS.
Zonal Congestion Credits	Payments equal to the directly assigned costs of BES and RPRS that were incurred in managing Zonal Congestion. Zonal Congestion Credits are paid to TCR Account Holders, appearing in ERCOT’s database, as the owner of record for the hour of relevant Settlement Intervals.