
Glossary - E
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 |
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E-TAG | Electronic Tag |
EAF | Equivalent Availability Factor |
EAL | Estimated Aggregate Liability |
EC | Electric Cooperative |
ECI | Element Competitiveness Index |
EDI | Electronic Data Interchange |
EEA | Energy Emergency Alert |
EFT | Electronic Funds Transfer |
ELSE | External Load Serving Entity |
EMMS | Energy and Market Management System |
EMS | Energy Management System |
EP | Energy Provider |
EPRI | Electric Power Research Institute |
EPS | ERCOT Polled Settlement |
ERCOT | Electric Reliability Council of Texas |
ERCOT BOARD | The Board of Directors of the Electric Reliability Council of Texas, Inc. |
ERS | Emergency Response Service |
ESI ID | Electric Service Identifier |
Electric Cooperative (EC) |
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Electric Reliability Council of Texas, Inc. (ERCOT) |
A Texas nonprofit corporation that has been certified by the PUCT as the Independent Organization for the ERCOT Region. |
Electric Reliability Organization | The organization approved by the Federal Energy Regulatory Commission (FERC) to perform the electric reliability organization functions described in the Electricity Modernization Act of 2005, 16 U.S.C. § 824o (2005). |
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. |
Electrical Bus |
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Electrically Similar Settlement Points |
Two or more distinct Settlement Points that are either mapped to the same electrical location in a market model or are mapped to locations that are connected by a transmission element with a reactance of less than 0.0005 per unit. |
Eligible Transmission Service Customer | A Transmission and/or Distribution Service Provider (TDSP) (for all uses of its transmission system), or any electric utility, MOU, EC, power generation company, CR, REP, federal power marketing agency, exempt wholesale generator, Qualifying Facility (QF), Independent Power Marketer, or other Entity that the PUCT has determined to be an Eligible Transmission Service Customer. |
Emergency Base Point | The target MW output level for a Resource that is selected by ERCOT during an Emergency Condition. |
Emergency Condition | An operating condition in which the safety or reliability of the ERCOT System is compromised or threatened, as determined by ERCOT. |
Emergency Notice | The fourth of four levels of communication issued by ERCOT to declare that ERCOT is operating in an Emergency Condition. |
Emergency Ramp Rate | The maximum rate of change (up and down) in MW per minute of a Resource to provide Responsive Reserve (RRS) that is deployed by ERCOT and that is provided to ERCOT in up to ten segments, each represented by a single MW per minute value (across the capacity of the Resource), which describes the available rate of change for the given range (between High Sustained Limit (HSL) and Low Sustained Limit (LSL)) of the generation or consumption of a Resource. In Real-Time SCED Dispatch, the up and down Emergency Ramp Rates are telemetered by the QSE to ERCOT and represent the total capacity (in MW) that the Resource can change from its current actual generation or consumption within the next five minutes divided by five. |
Emergency Rating | See Rating |
Emergency Response Service (ERS) |
An emergency service consistent with P.U.C. SUBST. R. 25.507, Electric Reliability Council of Texas (ERCOT) Emergency Response Service (ERS), used during an Energy Emergency Alert (EEA) to assist in maintaining or restoring ERCOT System frequency. ERS is not an Ancillary Service. ERS-10 |
Emergency Response Service (ERS) Contract Period | A period designated by ERCOT during which an ERS Resource is obligated to provide ERS consisting of all or part of the contiguous hours in an ERS Standard Contract Term. |
Emergency Response Service (ERS) Generator | Either (1) an individual generator contracted to provide ERS which is not a Generation Resource or a source of intermittent renewable generation and which provides ERS by injecting energy to the ERCOT System, or (2) an aggregation of such generators. |
Emergency Response Service (ERS) Load | A Load or aggregation of Loads contracted to provide ERS. |
Emergency Response Service (ERS) Resource | Either an ERS Load or an ERS Generator. |
Emergency Response Service (ERS) Self-Provision | The designation by a QSE of one or more ERS Resources to meet some or all of that QSE’s Load Ratio Share (LRS) of the total ERCOT-wide cost of ERS. |
Emergency Response Service (ERS) Standard Contract Term | One of three periods for which ERCOT may procure ERS. |
Emergency Response Service (ERS) Time Period |
Blocks of hours in an ERS Standard Contract Term in which ERS Resources are contractually committed to provide ERS. |
Energy Emergency Alert (EEA) | An orderly, predetermined procedure for maximizing use of available Resources and, only if necessary, curtailing load during an Emergency Condition while providing for the maximum possible continuity of service and maintaining the integrity of the ERCOT System. |
Energy Imbalance Service | An Ancillary Service that is provided when a difference occurs between the scheduled and the actual delivery of energy in Real-Time. |
Energy Offer Curve | A proposal to sell energy at a Settlement Point at a monotonically increasing price with increasing quantity. |
Energy Trade | A QSE-to-QSE financial transaction that transfers responsibility for energy between a buyer and a seller at a Settlement Point. |
Entity | Any natural person, partnership, municipal corporation, cooperative corporation, association, governmental subdivision, or public or private organization. |
ERCOT Polled Settlement (EPS) Meter | Any meter polled directly by ERCOT for use in the Settlement of the market. |
ERCOT Region | The power region, as defined in P.U.C. SUBST. R. 25.5, Definitions, represented by the ERCOT Control Area. |
ERCOT System | The interconnected power system that is under the jurisdiction of the PUCT and that is not synchronously interconnected with either the Eastern Interconnection or the Western Electricity Coordinating Council. |
ERCOT System Demand | The sum of all power flows, in MW, on the DC Ties and from Generation Resources metered at the points of their interconnections with the ERCOT System at any given time. |
ERCOT Transmission Grid | All Transmission Facilities that are part of the ERCOT System. |
External Load Serving Entity (ELSE) | An Entity that is registered as an LSE and is either:
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