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 |
| MAP | Mitigation Action Plan |
| MCP | Market Clearing Price |
| MCPC | Market Clearing Price for Capacity |
| MCPE | Market Clearing Price for Energy |
| MDAS | Meter Data Acquisition System |
| MIS | Market Information System |
| MMBtu | Million British Thermal Units |
| MOU | Municipally Owned Utility |
| MP | Market Participant |
| MPC | Maximum Power Consumption |
| MRA | Must-Run Alternative |
| MRE | Meter Reading Entity |
| MTLF | Mid-Term Load Forecast |
| MVA | Megavolt Ampere |
| MVAr | Mega Volt-Amperes reactive |
| MVAR | Megavolt Ampere Reactive |
| MW | Megawatt |
| MWh | Megawatt Hour |
| Maintenance Outage | See Outage |
| Make-Whole Charge | A charge made by ERCOT to a QSE for a Resource to recapture all or part of the revenues received by a QSE that exceed the Make-Whole Payment for a Resource. |
| Make-Whole Payment | A payment made by ERCOT to a QSE for a Resource to reimburse a QSE for allowable startup and minimum energy costs of a Resource not recovered in energy revenue when a Resource is committed by the DAM or by a RUC. |
| Mandatory Installation Threshold | A peak demand greater than 700 kW (or 700 kVA). |
| Market Clearing Price for Capacity (MCPC) | The hourly price for Ancillary Service capacity awarded in the DAM or a SASM. |
| 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 the public and to Market Participants, as a group or individually. Market Information System (MIS) Public Area Market Information System (MIS) Secure Area Market Information System (MIS) Certified Area |
| Market Participant | An Entity, other than ERCOT, that engages in any activity that is in whole or in part the subject of these Protocols, regardless of whether that Entity has signed an Agreement with ERCOT. Examples of such an Entity include but are not limited to the following: LSE, QSE, TDSP, CRR Account Holder, Resource Entity, and REC Account Holder. |
| Market Segment | The segments defined in Article 2 of the ERCOT Bylaws. |
| Mass Drop | The immediate cessation of service by a CR to all ESI IDs served by the CR. |
| Mass Transition | The transition of ESI IDs from one CR to a Provider of Last Resort (POLR) or designated CR, or from one TDSP to another TDSP, in a quantity or within a timeframe identified by Applicable Legal Authority. |
| Maximum Power Consumption (MPC) | For a Load Resource, the limit established by the QSE, continuously updated in Real-Time, that describes the maximum sustained power consumption of a Load Resource. The MPC shall be a positive number in MW. |
| 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 (MDAS) | The system used to obtain revenue quality meter data from EPS meters and Settlement Quality Meter Data from TSPs and DSPs for Settlement and to populate the DAS and 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) | A TSP or DSP that is responsible for providing ERCOT with ESI ID level consumption data as defined in Section 19, Texas Standard Electronic Transaction. In the case of an EPS Meter or ERCOT-populated ESI ID data (such as Generation Resource 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. |
| Minimum Reservation Price | The lowest price that a seller is willing to accept. |
| Minimum-Energy Offer | An offer for the costs incurred by a Resource in producing energy at the Resource’s LSL expressed in $/MWh. |
| Mismatched Schedule Processing Fee | The fee charged to a QSE that fails to correct a mismatched schedule in a timely manner. |
| Mitigated Offer Cap | An upper limit on the price of an offer as detailed in Section 4.4.9.4.1, Mitigated Offer Cap. |
| Mitigated Offer Floor | A lower limit on the price of an offer as detailed in Section 4.4.9.4.2, Mitigated Offer Floor. |
| Mothballed Generation Resource | See 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 (MOU) | A utility owned, operated, and controlled by a nonprofit corporation, the directors of which are appointed by one or more municipalities, or a utility owned, operated, or controlled by a municipality. |
| 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. |