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