Glossary - C

For your convenience, this page contains an alphabetically organized list of terms, definitions and common acronyms used in the electric utility industry.


Term/Acronym Definition
CAO Control Area Operator
CARD CRR Auction Revenue Distribution
CCD+ Cash Concentration and Disbursement Plus
CCF Capacity Conversion Factor
CCN Certificate of Convenience and Necessity
CEII Critical Energy Infrastructure Information
CEO Chief Executive Officer


Constant Frequency Control

CFE Comision Federal de Electricidad
CFTC Commodity Futures Trading Commission
CIM Common Information Model
CMLTD Current Maturities of Long-Term Debt
CMP Constraint Management Plan
CMZ Congestion Management Zone
COP Current Operating Plan
COPS Commercial Operations Subcommittee
CPS Control Performance Standard
CPT Central Prevailing Time
CR Competitive Retailer
CRR Congestion Revenue Right
CRRBA Congestion Revenue Right Balancing Account
CSA Continuous Service Agreement
CSV Comma Separated Value
CTX Corporate Trade Exchange
Capacity Trade A QSE-to-QSE financial transaction that transfers responsibility to supply capacity between a buyer and a seller at a Settlement Point.
Central Prevailing Time (CPT) Either Central Standard Time or Central Daylight Time, in effect in Austin, Texas.
Combined Cycle Generation Resource A specified configuration of physical Generation Resources (gas and steam turbines), with a distinct set of operating parameters and physical constraints, in a Combined Cycle Train registered with ERCOT.
Combined Cycle Train The combinations of gas turbines and steam turbines in an electric generation plant that employs more than one thermodynamic cycle. For example, a Combined Cycle Train refers to the combination of gas turbine generators (operating on the Brayton Cycle) with turbine exhaust waste heat boilers and steam turbine generators (operating on the Rankin Cycle) for the production of electric power. In the ERCOT market, Combined Cycle Trains are each registered as a plant that can operate as a Generation Resource in one or more Combined Cycle Generation Resource configurations.
Comision Federal de Electricidad  (CFE) The government agency in Mexico charged with the responsibility of operating the Mexican national electricity grid.

Commercial Operations Date

The date on which an Interconnecting Entity (IE) or a Resource Entity expects that construction and trial operation of a Resource will be completed and the Resource is expected to complete the Resource interconnection process and be approved for participation in ERCOT market operations.

Common Information Model (CIM) A standard way to communicate information about a transmission system. The CIM is used to describe the ERCOT transmission system topology consisting of Transmission Elements, including all the parameters needed to describe the Transmission Elements and how they interrelate to one another. The CIM that ERCOT and the TSP use must conform to the North American Electric Reliability Corporation (NERC) and Electric Power Research Institute (EPRI) standards for CIMs.
Competitive Constraint A contingency and limiting Transmission Element pair or group of Transmission Elements associated with a Generic Transmission Constraint (GTC) that is determined to be competitive using the process defined in Section 3.19, Constraint Competitiveness Tests.
Competitive Retailer (CR) A Municipally Owned Utility (MOU) or an Electric Cooperative (EC) that offers Customer Choice and sells electric energy at retail in the restructured electric power market in Texas, or a Retail Electric Provider (REP).
Competitive Retailer (CR) of Record The CR assigned to the Electric Service Identifier (ESI ID) in ERCOT’s database. There can be no more than one CR of Record assigned to an ESI ID for any given time period.
Compliance Period A calendar year beginning January 1 and ending December 31 in which Renewable Energy Credits (RECs) are required of a Retail Entity.
Compliance Premium A payment awarded by the Program Administrator in conjunction with a REC that is generated by a renewable energy source that is not powered by wind and meets the criteria of subsection (l) of P.U.C. SUBST. R. 25.173, Goal for Renewable Energy. For the purpose of the Renewable Portfolio Standard (RPS) requirements, one Compliance Premium is equal to one REC.
Conductor/Transformer 2-Hour Rating see Rating

Congestion Revenue Right (CRR)

A financial instrument that entitles the holder to be charged or to receive compensation (i.e., congestion rent), depending on the instrument, when the ERCOT Transmission Grid is congested in the DAM or in Real-Time.

Flowgate Right (FGR)

A type of CRR that entitles the holder to receive compensation and is evaluated in each CRR Auction and DAM as the positive power flows represented by the quantity of the CRR bid or offer (MW) on a flowgate (i.e., predefined directional network element or a predefined bundle of directional network elements).

Point-to-Point (PTP) Obligation

A type of CRR that entitles the holder to be charged or to receive compensation and is evaluated in each CRR Auction and DAM as the positive and negative power flows on all directional network elements created by the injection and withdrawal at the specified source and sink points of the quantity represented by the CRR bid or offer (MW).

Point-to-Point (PTP) Obligation with Links to an Option

A type of CRR that entitles a Non-Opt-In Entity’s (NOIE’s) PTP Obligation bought in the DAM to be reflective of the NOIE’s PTP Option.  To qualify as a PTP Obligation of this type, the source and sink pairs on both the NOIE’s PTP Obligation and the NOIE’s PTP Option shall be the same, and the MWs of the NOIE’s PTP Obligations shall be less than or equal to the number of MWs of the NOIE’s PTP Option.  Qualified PTP Obligations with Links to an Option shall be settled as if they were a PTP Option.

Point-to-Point (PTP) Option

A type of CRR that is evaluated in each CRR Auction and DAM as the positive power flows on all directional network elements created by the injection and withdrawal at the specified source and sink points in the quantity represented by the CRR bid or offer (MW), excluding all negative flows on all directional network elements. A PTP Option entitles the holder to receive compensation equal to the positive energy price difference between the sink and the source Settlement Point Prices. A PTP Option with Refund is evaluated in the same manner and compensated as described in Section 7.4.2, PCRR Allocation and Nomination Terms and Conditions.

Congestion Revenue Right (CRR) Account Holder An Entity that is qualified to become the owner of record of CRRs and is registered as a CRR Account Holder with ERCOT.
    Participating Congestion Revenue Right (CRR) Account Holder
    For a given CRR Auction, a CRR Account Holder who either owns one or more CRRs effective during the Operating Days covered by the CRR Auction, or whose Counter-Party has a non-zero credit limit available and allocated to the CRR Auction as described in paragraph (1) of Section, Auction Process.
Congestion Revenue Right (CRR) Auction A periodic auction by ERCOT that allows eligible CRR Account Holders to buy and sell CRRs.
Congestion Revenue Right (CRR) Auction Capacity The fraction of the network capacity that is offered for sale in a given CRR Auction.
Congestion Revenue Right (CRR) First Offering The CRR Auction, which is part of a CRR Long-Term Auction Sequence, in which a series of calendar months of CRRs is offered for sale for the first time.

Congestion Revenue Right (CRR) Long-Term Auction Sequence

A series of six CRR Auctions held consecutively, each of which entails the sale of a six-month window of CRRs.

Congestion Revenue Right (CRR) Monthly Auction The CRR Auction in which a calendar month is offered for sale for the last time. This CRR Auction may, but is not required to, be conducted on the same dates as a CRR Auction that is part of a CRR Long-Term Auction Sequence.
Congestion Revenue Right (CRR) Network Model A model of ERCOT network topology to be used in conducting a CRR Auction. It must be based on, but is not the same as, the Updated Network Model, as detailed in Section 3.10.3, CRR Network Model.
Congestion Revenue Right (CRR) Owner A CRR Account Holder that owns one or more CRRs.

Constant Frequency Control (CFC)

An operating mode of an Automatic Generation Control (AGC) system.  While in CFC, an AGC system will monitor only the frequency error to determine Resource adjustments needed to balance sources and obligations.  CFC controls generation to increase or decrease by the amount of frequency deviation multiplied by the bias.

Constraint Management Plan (CMP)

A set of pre-defined manual transmission system actions, or automatic transmission system actions that do not constitute a Remedial Action Scheme (RAS), which are executed in response to system conditions to prevent or to resolve one or more thermal or non-thermal transmission security violations or to optimize the transmission system. CMPs may be developed in cases where studies indicate economic dispatch alone may be unable to resolve a transmission security violation or in response to Real-Time conditions where Security-Constrained Economic Dispatch (SCED) is unable to resolve a transmission security violation. ERCOT will employ CMPs to facilitate the market use of the ERCOT Transmission Grid, while maintaining system security and reliability in accordance with the Protocols, Operating Guides and North American Electric Reliability Corporation (NERC) Reliability Standards. CMPs are intended to supplement, not to replace, the use of SCED for prevention or resolution of one or more thermal or non-thermal transmission security violations.

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, that continuously regulates, through automatic Resource control, its Resource(s) and interchange schedules to match its system Load and frequency schedule.
Control Area Operator (CAO) An individual or set of individuals responsible for monitoring and controlling operation of a Control Area.
Controllable Load Resource A Load Resource capable of controllably reducing or increasing consumption under dispatch control by ERCOT.
Controllable Load Resource Desired Load The MW consumption for a Controllable Load Resource produced by summing its Scheduled Power Consumption and Ancillary Service deployments.
Cost Allocation Zone One of the four zones in effect during the 2003 ERCOT market as they are changed pursuant to Section 3.4.2, Load Zone Modifications. A Cost Allocation Zone may be used by ERCOT to uplift certain costs to a QSE’s Load regardless of Non-Opt-In Entity (NOIE) Load Zone.
Counter-Party A single Entity that is a QSE and/or a CRR Account Holder. A Counter-Party includes all registrations as a QSE, all subordinate QSEs, and all CRR Account Holders by the same Entity.
Credible Single Contingency
  1. The Forced Outage of any single Transmission Facility or, during a single fault, the Forced Outage of multiple Transmission Facilities (single fault multiple element);
  2. The Forced Outage of a double-circuit transmission line in excess of 0.5 miles in length;
  3. The Forced Outage of any single Generation Resource, and in the case of a Combined Cycle Train, the Forced Outage of the combustion turbine and the steam turbine if they cannot operate separately as provided in the Resource registration process; or
  4. For transmission planning purposes, contingencies are defined in the Planning Guide.
Critical Energy Infrastructure Information (CEII) Information concerning proposed or existing critical infrastructure (physical or virtual) that:
  1. Relates to the production, generation, transmission or distribution of energy;
  2. Could be useful to a person planning an attack on critical infrastructure;
  3. Is exempt from mandatory disclosure under the Freedom of Information Act, 5 U.S.C. § 552; and
  4. Gives strategic information beyond the location of the critical infrastructure.
Current Operating Plan (COP) A plan by a QSE reflecting anticipated operating conditions for each of the Resources that it represents for each hour in the next seven Operating Days, including Resource operational data, Resource Status, and Ancillary Service Schedule.
Current Operating Plan (COP) and Trades Snapshot A record of a QSE’s Capacity Trades, Energy Trades, and most recent COP.


An Entity that purchases electricity for its 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 Registration Database The database maintained by the registration agent containing information identifying each Premise, including current and previous CRs serving the Premise.