M
- MAAC—Mid Atlantic Area Council (US- geographically within PJM)
- MADRI—Mid Atlantic Distributed Resources Initiative (US)
- MAIN—Mid America Interconnected Network (US)
- MAOP—Maximum allowable operating pressure
- MAPP—Mid Continent Area Power Pool (US)
- MBD—million barrels per day
- MBOED—One million barrels of oil equivalent(EU)
- MBR—Market based Rates
- MBS—Macro economic Budget Support
- Mcf—Roman numeral "M" for one thousand cubic feet (measurement of natural gas)
- MDD—Maximum Daily Delivery Obligations
- MDDQ—Maximum Daily Delivery Quantity
- MDM—Meter Data Management
- MDQ—Maximum Daily Quantities
- MECS—Manufacturing Energy Consumption Survey
- MEDREP—Mediterranean Renewables Energy Partnership
- MER—Maximum efficient rate
- MERC—Mobile Emission Reduction Credit (MERC) (US)
- MFV—Modified fixed variable rate
- MISO—Midwest Independent Transmission System Operator, Inc. A Regional Transmission Organization. (US)
- MLP—Maximum lawful price
- MLRA—Major Land Resource Areas
- MM—Used to denote million in gas usage
- MMbbl/d—one million barrels of oil per day
- MMBtu—1 million British thermal units, same as dekatherm
- MMC—Market Monitoring Center
- MMCF—one million cubic feet (measurement of natural gas)
- MMCFD—one million cubic feet per day
- MMGAL—one million gallons
- MMGAL/D—one million gallons per day
- MMS—Mineral Management Service (US)
- MMST—one million short tons
- MODFLOW—model of groundwater flow
- MOU—Memorandum of Understanding
- MOX—mixed oxide fuel (nuclear)
- MPG—Miles per gallon
- MRO—Midwest Reliability Organization (US)
- MSA—metropolitan statistical area
- MSHA—Mine Safety and Health Administration (US)
- msl—Mean sea level
- MSW—Municipal solid waste
- Mt—one million tons (ambiguous as to whether short tons or metric tons)
- —one Metric ton
- MTBE—methyl tertiary butyl ether
- MTEF—Medium Term Expenditure Framework
- MTEP—Midwest ISO Transmission Expansion Plan 2005 (US)
- Mtoe—One million tons of oil equivalent(EU)
- Muni—Municipality
- MVA—Megavolt amperes (one million volt amperes)
- MW—Megawatt (one million watts)
- MWE—megawatt electric
- MWh—Megawatt hour (one million watt hours)
Read more about this topic: List Of Energy Abbreviations