Glossary
For your convenience, this page contains an alphabetically organized list of terms, definitions and common acronyms used in the electric utility industry.
| A | B | C | D | E | F | G | H | I | J | K | L | M |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
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 |
|
| 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). |