Glossary - R
For your convenience, this page contains an alphabetically organized list of terms, definitions and common acronyms used in the electric utility industry.
|RAP||Remedial Action Plan|
|RDF||Reserve Discount Factor|
|REC||Renewable Energy Credit|
|REP||Retail Electric Provider|
|RMS||Retail Market Subcommittee|
|ROS||Reliability and Operations Subcommittee|
|RPG||Regional Planning Group|
|RPP||Renewable Production Potential|
|RPS||Renewable Portfolio Standard|
Reconfiguration Supplemental Ancillary Services Market
|RTEP||Real-Time Energy Price|
|RUC||Reliability Unit Commitment|
Conductor/Transformer 2-Hour Rating
|Reactive Power||The product of voltage and the out-of-phase component of alternating current. Reactive Power, usually measured in MVAr, is produced by capacitors, overexcited generators and other capacitive devices and is absorbed by reactors, under-excited generators and other inductive devices.|
|Real-Time||The current instant in time.|
|Real-Time Market (RTM) Energy Bid||A proposal to buy energy in the RTM at a monotonically non-increasing price with increasing quantity.|
|Real-Time Market (RTM) Final Statement||The RTM Settlement Statement issued at the end of the 55th day following the Operating Day, as described in Section 9.5.5, RTM Final Statement.|
|Real-Time Market (RTM) Initial Statement||See Settlement Statement|
|Real-Time Market (RTM) Resettlement Statement||See Settlement Statement|
|Real-Time Market (RTM) True-Up Statement||See Settlement Statement|
|Real-Time Off-Line Reserve Price Adder||A Real-Time price adder that captures the value of the opportunity costs of Off-Line reserves based on the defined ORDC as detailed in Section 6.7.4, Real-Time Ancillary Service Imbalance Payment or Charge.|
Real-Time On-Line Reliability Deployment Price
A Real-Time price for each 15-minute Settlement Interval reflecting the impact of reliability deployments on energy prices that is calculated from the Real-Time On-Line Reliability Deployment Price Adder.
Real-Time On-Line Reliability Deployment Price Adder
A Real-Time price adder that captures the impact of reliability deployments on energy prices for each Security-Constrained Economic Dispatch (SCED) process as detailed in Section 220.127.116.11.1, Determination of Real-Time On-Line Reliability Deployment Price Adder, and Section 6.7.4, Real-Time Ancillary Service Imbalance Payment or Charge.
|Real-Time On-Line Reserve Price Adder||A Real-Time price adder that captures the value of the opportunity costs of On-Line reserves based on the defined ORDC as detailed in Section 6.7.4.|
|Real-Time Reserve Price for Off-Line Reserves||A Real-Time price calculated for Off-Line reserves for each 15-minute Settlement Interval using the data and formulas as detailed in Section 6.7.4.|
|Real-Time Reserve Price for On-Line Reserves||A Real-Time price calculated for On-Line reserves for each 15-minute Settlement Interval using the data and formulas as detailed in Section 6.7.4.|
|Redacted Network Operations Model||A version of the Network Operations Model, redacted to exclude Private Use Network Load data and the following defined Resource Parameters as applicable:
|Regional Planning Group (RPG) Project Review||
The evaluation of a proposed transmission project pursuant to the process described in Section 3.11.4, Regional Planning Group Project Review Process.
An Ancillary Service that consists of either Regulation Down Service (Reg-Down) or Regulation Up Service (Reg-Up)Fast Responding Regulation Service (FRRS)
A subset of Regulation Service that consists of either Fast Responding Regulation Down Service (FRRS-Down) or Fast Responding Regulation Up Service (FRRS-Up). Except where otherwise specified, all requirements that apply to Regulation Service also apply to FRRS.Regulation Down Service (Reg-Down)
An Ancillary Service that provides capacity that can respond to signals from ERCOT within five seconds to respond to changes in system frequency. Such capacity is the amount available below any Base Point but above the LSL of a Generation Resource and may be called on to change output as necessary throughout the range of capacity available to maintain proper system frequency. A Load Resource providing Reg-Down must be able to increase and decrease Load as deployed within its Ancillary Service Schedule for Reg-Down below the Load Resource’s MPC limit.Fast Responding Regulation Down Service (FRRS-Down)
A subset of Reg-Down in which the participating Resource provides Reg-Down capacity to ERCOT within 60 cycles of either its receipt of an ERCOT Dispatch Instruction or its detection of a trigger frequency independent of an ERCOT Dispatch Instruction. Except where otherwise specified, all requirements that apply to Reg-Down also apply to FRRS-Down.Regulation Up Service (Reg-Up)
An Ancillary Service that provides capacity that can respond to signals from ERCOT within five seconds to respond to changes in system frequency. Such capacity is the amount available above any Base Point but below the HSL of a Generation Resource and may be called on to change output as necessary throughout the range of capacity available to maintain proper system frequency. A Load Resource providing Reg-Up must be able to increase and decrease Load as deployed within its Ancillary Service Schedule for Reg-Up above the Load Resource’s LPC limit.Fast Responding Regulation Up Service (FRRS-Up)
A subset of Reg-Up in which the participating Resource provides Reg-Up capacity to ERCOT within 60 cycles of either its receipt of an ERCOT Dispatch Instruction or its detection of a trigger frequency independent of an ERCOT Dispatch Instruction. Except where otherwise specified, all requirements that apply to Reg-Up also apply to FRRS-Up.
|Regulation Up Service (Reg-Up)||See Regulation Service|
An Entity selected by the Public Utility Commission of Texas (PUCT) to monitor compliance with all state reliability-related laws, rules, and ERCOT procedures, including Protocols, processes, and any other operating standards applicable to the ERCOT Region.
|Reliability Must Run (RMR) Service||An Ancillary Service provided from an RMR Unit under an Agreement with ERCOT.|
Reliability Must Run (RMR) Unit
A Generation Resource operated under the terms of an Agreement with ERCOT that would not otherwise be operated except that it is necessary to provide voltage support, stability or management of localized transmission constraints under Credible Single Contingency criteria where market solutions do not exist.
|Reliability Unit Commitment (RUC)||A process to ensure that there is adequate Resource capacity and Ancillary Service capacity committed in the proper locations to serve ERCOT forecasted Load.|
|Reliability Unit Commitment (RUC) Buy-Back Hour||An Operating Hour for which a QSE with a Resource that is not an RMR Unit that has been committed to come On-Line by a RUC process or Verbal Dispatch Instruction (VDI) may choose, at its sole discretion, to self-commit that Resource in lieu of the RUC instruction or VDI.|
|Reliability Unit Commitment (RUC) Cancellation||An ERCOT instruction, prior to breaker close, to cancel a previously issued RUC instruction.|
|Reliability Unit Commitment (RUC) Study Period||As defined under Section 5.1, Introduction.|
|Reliability Unit Commitment (RUC)-Committed Hour||An Operating Hour for which a RUC has committed a Resource to be On-Line and the QSE has not designated a RUC Buy-Back Hour.|
|Reliability Unit Commitment (RUC)-Committed Interval||A Settlement Interval for which there is a RUC instruction to commit a Resource.|
|Remedial Action Plan (RAP)||A set of pre-defined actions to execute post-contingency to address voltage issues or in order to reduce loading on one or more given, monitored Transmission Facilities to below their Emergency Rating within 15 minutes. RAPs are sufficiently dependable to assume they can be executed without loss of reliability to the interconnected network, with restoration of normal operating conditions and below Normal Rating within two hours as defined in the Network Operations Model. RAPs may be relied upon in allowing additional use of the transmission system in SCED. RAPs may not include Load shedding.|
|Renewable Energy Credit (REC)||A tradable instrument that represents all of the renewable attributes associated with one 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 Holder.|
|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 Renewable Energy Credit 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 Public Utility Regulatory Act (PURA), TEX. UTIL. CODE ANN. Â§ 39.904 (Vernon 1998 & Supp. 2007) and P.U.C. SUBST. R. 25.173(h).|
Renewable Production Potential (RPP)
The maximum generation in MWh per interval from an Intermittent Renewable Resource (IRR) that could be generated from all available units of that Resource. The RPP depends on the renewable energy that can be generated from the available units (wind, solar radiation, or run-of-river water supply), current environmental conditions and the energy conversion characteristics of each unit.
|Repowered Facility||An existing facility that has been modernized or upgraded to use renewable energy technology to produce electricity consistent with P.U.C. SUBST. R. 25.173, Goal for Renewable Energy.|
|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 Reliability and Operations Subcommittee (ROS).|
|Resettlement Statement||See Settlement Statement|
The term is used to refer to both a Generation Resource and a Load Resource. The term "Resource" used by itself in these Protocols does not include a Non-Modeled Generator or an ERS Resource.
|Resource Category||The generation technology category designated for a Generation Resource in its Resource Registration documentation.|
Resource Commissioning Date
The date on which ERCOT declares that a Resource has completed all qualification testing administered by ERCOT as part of the Resource Interconnection process so that a Resource is approved for participation in ERCOT market operations.
Resource Connectivity Node
The Electrical Bus to which the terminal of a Resource is connected.
|Resource Entity||An Entity that owns or controls an All-Inclusive Resource and is registered with ERCOT as a Resource Entity.|
|Resource ID (RID)||A unique identifier assigned to each Resource used in the registration and Settlements systems managed by ERCOT.|
|Resource Node||Either a logical construct that creates a virtual pricing point required to model a Combined-Cycle Configuration or an Electrical Bus defined in the Network Operations Model, at which a Generation Resource's Settlement Point Price or WSL's Settlement Point Price is calculated and used in Settlement. All Resource Nodes shall be identified in accordance with the document titled "Procedure for Identifying Resource Nodes," which shall be approved by the appropriate TAC subcommittee and posted to the MIS Public Area. For a Generation Resource that is connected to the ERCOT Transmission Grid only by one or more radial transmission lines that all originate at the Generation Resource and terminate in a single substation switchyard, the Resource Node is an Electrical Bus in that substation. For all other Generation Resources, the Resource Node is the Generation Resource's side of the Electrical Bus at which the Generation Resource is connected to the ERCOT Transmission Grid.|
|Resource Parameters||Resource-specific parameters required for use in ERCOT business processes. This is a subset of Resource Registration data that can be changed in the MIS in Real-Time.|
|Resource Registration||Provision of Resource information to register All-Inclusive Resources.|
|Resource Status||The operational state of a Resource as provided in Section 3.9, Current Operating Plan (COP).|
|Responsive Reserve (RRS)||An Ancillary Service that provides operating reserves that is intended to:
|Retail Business Day||See Business Day|
|Retail Business Hour||Any hour within a Retail Business Day.|
|Retail Electric Provider (REP)||As defined in P.U.C. SUBST. R. 25.5, Definitions, an Entity that sells electric energy to retail Customers in Texas but does not own or operate generation assets and is not an MOU or EC.|
|Retail Entity||An MOU, generation and transmission cooperative or distribution cooperative that offers Customer Choice; REP; or IOU that has not unbundled pursuant to Public Utility Regulatory Act (PURA), TEX. UTIL. CODE ANN. Â§ 39.051 (Vernon 1998 & Supp. 2007).|
|Revenue Quality Meter||For EPS Meters, a meter that complies with the Protocols and the Settlement Metering Operating Guide. For TSP- or DSP-metered Entities, a meter that complies with Governmental Authority-approved meter standards, or the Protocols and the Operating Guides.|