List of energy abbreviations

• AAQS—Ambient Air Quality Standards (environment) (US)
• AAU—Assigned amount units (measurement)
• ABT—Availability based tariff (electricity)
• ABF—Aquatic Base Flow (Hydropower) (electricity)
• AC—Alternating current
• ACA—Annual Charge Adjustment (electricity)
• ACE—Area Control Error (electricity)
• ACEEE—American Council for an Energy-Efficient Economy
• ACRS—Accelerated Cost Recovery System (finance)
• ADITC—Accumulated Deferred Investment Tax Credit (policy)
• ADR—Asset Depreciation Range (finance)
• AEP—American Electric Power (electricity)
• AESO—Alberta Electric System Operator
• AFE—Authority for Expenditure or Authorization for Expenditure
• AFUDC—allowance for funds used during construction
• AFV—Alternative fuel vehicle
• AGA—American Gas Association
• AGC—Automatic generation control
• AGD—Associated Gas Distributors (US)
• AIEE—American Institute of Electrical Engineers
• AIMA—Agricultural Impact Mitigation Agreement (US)
• ALJ—Administrative law judge
• AMBO—Armenia, Macedonia, Bulgaria Oil pipeline
• AMI—Advanced metering infrastructure
• AMR—Automated meter reading also known as Automatic Meter Reading
• AMRA—Automatic Meter Reading Association
• ANGTA—Alaskan Natural Gas Transportation Act of 1977 to build the Alaska gas pipeline
• ANGTS—Alaskan Natural Gas Transportation System
• ANSI—American National Standards Institute
• AOS—Authorized Overrun Service
• APA—Administrative Procedure Act
  • —Alaska Power Administration
• APE—Area of potential effect (electricity)
• API—American Petroleum Institute (oil)
• APPA—American Public Power Association (electricity)
• APR—Actual peak reduction (e.g. in demand response systems) (electricity)
• AQCR—Air Quality Control Region (US) (environment)
• ARA—(in shipping) ports of Amsterdam – Rotterdam – Antwerp (oil)
• ARR—Auction Revenue Rights (electricity)
• ASCC—Alaskan System Coordination Council
• ASE—Alliance to Save Energy
• ASTM—American Society for Testing and Materials
• ATC—Available transfer capability
• AVR—Automatic Voltage Regulator (electricity)

• BA—Balancing Authority
• BA—Biological Assessment
• BACT—Best Available Control Technology
• BBL/D—Barrel per day
• BBL/SD—Barrel per day, on stream days
• BBL—barrel (42 gallons)
  • —Balgzand Bacton Line (BBL Pipeline)
• BCD—Barrel per day, on calendar days
• BCF—billion cubic feet
• BCP—Blackstart Capability Plan
• BES—Bulk electric system (Electricity transmission)
• BfP—Bureau Fédéral du Plan (Belgium). (Has responsibilities over economic, social and environmental policy
• bhp— Brake horsepower
• BIA—Bureau of Indian Affairs (US)
• BIPV—Building Integrated Photo Voltaic
• bl—Barrel
• BLM—Bureau of Land Management of United States Department of the Interior
• BLS—Bureau of Labor Statistics of United States Department of Labor
• BOE—Barrel of oil equivalent (international)
• BPA—Bonneville Power Administration (US)
• BPL—Broadband over power line
• BPS—Bulk Power System (Electricity transmission)
• BTMG—Behind The Meter Generation
• BTU—British thermal unit(s)
• BTX—from BTX process, a mixture of benzene, toluene, and xylene (oil)
• BuRec—United States Bureau of Reclamation (government)
• BWR—Boiling water reactor (nuclear)

• C&I—Commercial and industrial customers (Electricity transmission)
• CA—Carbon Abatement- increasing carbon-neutrality
  • —Control area (EU) – The portion of the generation and transmission system controlled by a single transmission system operator. (See also TSO).
• CAA—Clean Air Act (US)
• CAEM—Center for the Advancement of Energy Markets (US)
• CAES—Compressed Air Energy Storage
• CAFE—Corporate Average Fuel Economy standards (US)
• CAISO—California Independent System Operator Corporation, a regional transmission organization. (US)
• CAP—Capacity market programs
  • —Climate Action Plan
• CAPM—Capital asset pricing model
• CARB—California Air Resources Board
• CBL—Customer Baseline Load[1]
• CBM—Capacity Benefit Margin
• CBOB—Conventional Gasoline Blendstock for Oxygenate Blending (Motor Gasoline Blending Component)
• CC—Combined cycle see also CCPP and CCGT
• CCGT—Combined cycle gas turbine electricity generator
• CCLIP—Conditional Credit Line for Investment Projects
• CCN—Certificate of Convenience and Necessity (utilities regulation)
• CCPG—Colorado Coordinated Planning Group
• CCPP—Combined cycle power plant
• CD—Contract Demand
• CDD—Cooling degree day, a qualitative index used to reflect the demand for energy to cool a business
• CDM—Clean Development Mechanism
• CEA—Country Environmental Analysis
• CEC—California Energy Commission
  • —Commission for Environmental Cooperation
  • —Council of the European Communities
• CEEC—Central and Eastern European Countries
• CEMS—Continuous emissions monitoring system
• CEP—Country Environmental Profile
  • —Clean Energy Partnership, a joint hydrogen-project in Europe.
• CEPS—Centre for European Policy Studies
• CEPII—Centre d'Etudes Prospectives et d'Informations Internationales Economics think tank
• CEQ—Council on Environmental Quality
• CER—Certified Emission Reduction
• CERA—Cambridge Energy Research Associates
• CERCLA—Comprehensive Environmental Response, Compensation, and Liability Act "Superfund" (US)
• CERCLIS—Comprehensive Environmental Response, Compensation, and Liability Information System (US)
• CERTS—Consortium for Electric Reliability Technology Solutions sponsored by the United States Department of Energy and California Energy Commission (US)
• CfD—Contract for difference
• CFS—cubic feet per second
• CFTC—Commodity Futures Trading Commission
• CH₄—Methane
• CHP—Combined heat and power
• CIAC—Contributions in Aid of Construction
• CIP—Critical Infrastructure Protection (US)
  • —see also EPCIP European Programme for Critical Infrastructure Protection
• CMVE—Competitive Market Value Estimate
• CNG—Compressed natural gas
• CO—Carbon monoxide
• CO₂—Carbon dioxide
• COC—Cost of capital
• COE—U.S. Army Corps of Engineers
• CP—Coincident Peak
  • —Certificate Proceeding
• CPA—California Power Authority
• CPI—Consumer Price Index
• CPP—Critical Peak Pricing
• CPP-F—Critical peak fixed
• CPP-F—Critical peak variable
• CPS—Control Performance Standard
  • —Cycles per second (hertz)
• CPUC—California Public Utilities Commission
• CREF—Caribbean Renewable Energy Facility
• CRP—Conservation Reserve Program (US)
• CRT—Capacity Reservation Tariff
• CSD—Commission for Sustainable Development (UN)
• CSEM—Center for the Study of Energy Markets (US)
• CSP—Country Strategy Paper
  • —Curtailment service provider
• CT—Combustion turbine (electricity)
• CZMA—Coastal Zone Management Act

• DADRP—Day Ahead Demand Response Program
• DADS-Demand response Availability Data System
• DANIDA—Danish International Development Agency
• DA-RTP—RTP Day ahead real time pricing (regarding Electricity metering)
• DC—Direct current
• DCLM—Direct control load management
• DCS—Disturbance Control Standard
• DEFG—Distributed Energy Financial Group (US)
• DEIS—Draft Environmental Impact Statement (US)
• DER—Distributed Energy Resources
• DERMS—Distributed Energy Resource Management Systems
• DF—Distribution Factor
• DG—Distributed generation (electricity)
  • —Directorate-General (EU) (government)
• DIIS—Danish Institute for International Studies (organization)
• DLC—Direct load control (regarding Load management)
• DME—Disturbance Monitoring Equipment
• DO—Dissolved oxygen
• DoD—Depth of discharge, energy drawn from a battery
• DOE—United States Department of Energy (government)
• DOE/FE—United States Department of Energy Office of Fossil Energy (government)
• DOI—United States Department of the Interior (government)
• DOT—United States Department of Transportation (government)
• DP—Distribution point
• DR—Demand response
• DRAM—Demand Response and Advanced Metering Coalition
• DRB—Demonstrated reserve base
• DRCC—Demand Response Coordinating Council (coalition)
• DRR—Demand Response resources
• DRRC—Demand Response Research Center (California)
• DSM—Demand side management
• DSO—Distribution system operator (regarding electricity distribution)
• Dth—Dekatherm (defined as 1 million British thermal units, also written "MMBtu") (measurement)
• DTW—dealer tank wagon (as in, "oil companies setting regional dealer tank wagon pricing") (Oil)

• E&D—Exploration and development expenses
• E85—E85 fuel: A fuel containing a mixture of 85 percent ethanol and 15 percent gasoline
• E95—like E85 fuel but with less gasoline. A fuel containing a mixture of 95 percent ethanol and 5 percent gasoline
• EA—Environmental assessment as in an Environmental impact assessment
• EAR—Estimated additional resources, as in considering reserves of uranium deposits
• EC—European Commission
• ECAR—East Central Area Reliability Coordination Agreement (US)
• EPCIP—European Programme for Critical Infrastructure Protection
• ECPA—Electric Consumers Protection Act (US)
• EDC—Electric Distribution Company (electricity)
• EdF—Electricité de France
• EDRP—Emergency demand response program
• EE—Energy efficiency
• EEI—Edison Electric Institute
• EERS—Energy Efficiency Resource Standards
• EF—Earth Fault
• EHV—Extra high voltage
• EIA—Energy Information Administration (US)
  • —Environmental impact assessment (international)
• EIB—European Investment Bank
• EIM—Energy Imbalance Market (electricity)
• EIPP—Eastern Interconnection Phasor Project
• EIS—Environmental Impact Statement (US)
• ELCON—Electricity Consumers Resources Council
• EMF—Electro magnetic field
• EMP—Environmental Management Plan
• EOR—Enhanced oil recovery
• EPA—United States Environmental Protection Agency
• EPAct—Energy Policy Act of 1992 (US)
  • —Energy Policy Act of 2005 (US)
• EPRI—Electric Power Research Institute (US)
• EPSA—Electric Power Supply Association
• EQR—Electric Quarterly Report
• ERA—Economic Regulatory Administration (part of United States Department of Energy
• ERCOT—Electric Reliability Council of Texas, Inc, a regional transmission organization. (US)
• ERGEG—European Regulators Group for Electricity and Gas
• ERIS—Energy Resource Interconnection Service (electricity)
• ERO—Electric Reliability Organization. The US designated NERC as its ERO.
• ERoEI—Energy returned on energy invested
• ERRA—Energy Regulators Regional Association
• ESCO—Energy service company
• ESI—Environmental Sustainability Index
• ESMAP—Energy Sector Management Assistance Programme
• ESP—Electrostatic precipitator
• ESS—Energy Storage System, as in grid energy storage (electricity)
• ETBE—ethyl tertiary butyl ether
• ETSO—European Transmission System Operators association
• EU—European Union
• EUEF—European Union Energy Facility
• EUEI—European Union Energy Initiative

• FAC—Fuel Adjustment Clause
• FACTS—Flexible Alternating Current Transmission System
• FASB—Financial Accounting Standards Board
• FBR—fast breeder reactor
• FCITC—First Contingency Incremental Transfer Capability
• FEIS—Final Environmental impact statement (US)
• FELCC—Firm Energy Load Carrying Capability
• FERC—Federal Energy Regulatory Commission (U.S.)
• FGD—Flue-gas desulfurization
• FINESSE—Financing Energy Services for Small Scale Users
• Fishway—Fish ladder
• FLPMA—Federal Land Policy and Management Act (US)
• FME—Free market economics
• FONSI—Finding of no significant impact. See Environmental impact statement (US)
• FPA—Federal Power Act (US)
• FPC—Federal Power Commission (US)
• FPS—Firm peaking service. See Peaking power plant
• FRCC—Florida Reliability Coordinating Council (US)
• FRS—Financial Reporting System
• FT—Firm Transportation Service
• FTC—Federal Trade Commission (US)
• FTR—Firm Transmission Rights
  • —Financial Transmission Rights. See explanation in electricity markets.
• FTS—Firm transportation service
• FUA—The Fuel Use Act (US)
• FUCO—Foreign Utility Company
• FWPA—Federal Water Power Act (US)

• G&T—Generation and transmission utility cooperative (electricity)
• GADS—Generating Availability Data System (electricity)
• GAL—gallon (measurement)
• GAO—Government Accountability Office (General Accounting Office) (US) (government)
• GATT—General Agreement on Tariffs and Trade (government)
• GDP—gross domestic product (economics)
• GEF—Global Environmental Facility (environment)
• Genco—Any company doing electricity generation (US) (electricity)
• GFN—Global Footprint Network
• GFSE—Global Forum on Sustainable Energy (organization)
• GIC—Gross Inland (energy) Consumption (EU) (energy)
• GHG—Greenhouse gas (climate)
• GIA—Generator Interconnection Agreement (electricity)
• GIC—Gas Inventory Charge (natural gas)
• GISB—Gas Industry Standards Board (now NAESB) (US) (natural gas)
• GLDF—Generator to Load Distribution Factor. See Load balancing (electricity)
• Gm³—Billion cubic metres (measurement – gas)
• GMO—Genetically modified organism
• GMP—Green Mountain Power (US) (electricity)
• GNP—gross national product (economics)
• GNSED—Global Network for Sustainable Energy Development
• GRI—Gas Research Institute (US) (natural gas)
• GRC—General rate case (US) (regulatory)
• GridCo—Any company running a transmission grid (electricity). Also known as a TransCo (US) (electricity)
• GSF—Generator to Load Distribution Factor. See Load balancing (electricity)
• GPE—Gravitational Potential Energy
• GSR—Gas Supply Realignment (natural gas)
• Gt—Gigaton (1 billion tons) (measurement)
• GTCC—Gas Turbine Combined Cycle (electricity)
• GTI—Gas Technology Institute (US)
• Gtoe—One billion tons of oil equivalent(EU) (measurement- oil)
• GVEP—Global Village Energy Partnership (organization)
• GVW—gross vehicle weight (transportation)
• GW—Gigawatt (one billion watts) (measurement- elect)
• GWE—Gigawatt of electric energy (measurement- elect)
• Gwh—Gigawatt hour (one billion watt hours) (measurement- elect)
• GWP—global warming potential (climate)

• HCA—Host Control Area (electricity)
• HDD—Heating degree days a qualitative index used to reflect the demand for energy to heat a business (conservation)
• HERS—Home energy rating standard (conservation)
• HHI—Herfindahl–Hirschman Index (markets)
• HID—high intensity discharge (electricity)
• hp—Horsepower (measurement)
• HRSG—Heat recovery steam generation
• HTGR—high temperature gas cooled reactor (nuclear)
• HVAC—Heating, ventilation, and air conditioning (conservation)
  • —High voltage alternating current (electricity)
• HVAR—Highly Valued Aquatic Resource
• HVDC—High Voltage Direct Current

• I/C—Interruptible /Curtailable (electricity)
• ICAP—Installed Capacity (electricity)
• ICAP-SCR—Installed capacity special case resources (electricity)
• ICCP—Inter-Control Center Communications Protocol (electricity)
• ICE—Internal combustion engine (transportation)
• ICT—Independent Coordinator of Transmission (US) (electricity)
  • —Information and Communication Technology
• IDC—Interchange Distribution Calculator (electricity)
• IEA—International Energy Agency (Paris)
• IEM—Internal electricity market (electricity)
• IEEE—Institute of Electrical and Electronics Engineers
• IEPE—Institute of Energy Policy and Economics (France)
• IER—Incremental Energy Rate
• IET—International emission trading (policy)
• IGCC—Integrated coal gasification combined cycle
• IGIC—Interim gas inventory charge (natural gas)
• IGSC—Interim gas supply charge (natural gas)
• IGT—Institute of Gas Technology (natural gas)
• IGU—International Gas Union (natural gas)
• IHR—Incremental Heat Rate- plant monitoring (electricity)
• IIASA—International Institute for Applied System Analysis
• IJC—International Joint Commission
• ILP—Integrated Licensing Process
• INGAA—Interstate Natural Gas Association of America
• IOS—Interconnected Operations Services (electricity)
• IOU—Investor owned utility (electricity)
• IPAA—Independent Petroleum Association of America (oil)
• IPCC—Intergovernmental Panel on Climate Change (climate)
• IPP—Independent Power Producer (electricity)
• IPS/UPS—Integrated Power System/United Power System, consisting of Independent Power Systems of 12 countries bordering Russia and the Unified Power System of Russia
• IRC—ISO / RTO Council (electricity)
• IROL—Interconnection Reliability Operating Limit (electricity)
• IRP—Integrated Resource Planning
• IRR—Internal Rate of Return (finance)
• ISO—Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• ISO-NE—Independent System Operator of New England, a regional transmission organization. (US) (electricity)
• ISO—NE ISO New England, Inc. (electricity)
• ISS—Interruptible Sales Service
• IT—Interruptible Transportation is gas shipment via pipeline whose delivery may be interrupted in favor of "firm shipment" contracts if there is lack of capacity. (natural gas)
• ITC—Investment tax credit (policy)
• ITS—"Interruptible Transportation Service" is gas shipment via pipeline whose delivery may be interrupted in favor of "firm shipment" contracts if there is lack of capacity. (natural gas)

• JRC—Joint Research Centre
• JREC—Johannesburg Renewable Energy Coalition

• koe—One kilogram oil equivalent (EU) (measurement)
• kV—Kilovolt (one thousand volts) (measurement)
• kVA—One thousand volt Ampere (measurement)
• kvar—one thousand vars (measurement)
• kW—Kilowatt (one thousand watts) (measurement)
• kWE—kilowatt electric (measurement)
• kWh—Kilowatt hour (one thousand watt hours) (measurement)

• LaaR—Load acting as a resource (ERCOT category) (electricity)
• LBA—Local Balancing Authority (electricity)
• LBNL—Lawrence Berkeley National Laboratory (US)
• LCOD—Levelized cost of delivery (electricity)
• LCOE—Levelized cost of energy (electricity)
• LCOS—Levelized cost of storage (electricity)
• LDC—Local distribution company (electricity)
• LED—Light Emitting Diode
• LEVP—Low Emissions Vehicle Program
• LHV—lower heating value
• Li-Ion—Lithium Ion (electricity storage)
• LIHEAP—Low Income Home Energy Assistance Program
• LIPA—Long Island Power Authority (US) (electricity)
• LLF—Load-loss factor (electricity)
• LMP—Locational marginal price/pricing. See explanation in electricity markets.
• LMR—Load Modifying Resource (electricity)
• LNG—Liquified Natural Gas
• LODF—Line Outage Distribution Factor (electricity)
• LOLE—Loss of Load Expectation (electricity)
• LPG—liquefied petroleum gas
• LPN—Lender Participation Notes
• LRG—liquefied refinery gases
• LSE—Load serving entity
• LSF—Load Shift Factor
• lsfo—Low sulfur fuel oil
• LWR—light water reactor

• 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
• MBOE—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)
• MDAS—Meter Data Acquisition System
• 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—Midcontinent Independent 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—Minerals Management Service (US)
• MMST—one million short tons
• MODFLOW—model of groundwater flow
• MOU—Memorandum of Understanding
• MOX—mixed oxide fuel (nuclear)
• MPAN - Meter Point Administration Number
• 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)

• NAAQS—National Ambient Air Quality Standards (US)
• NAESB—North American Energy Standards Board (formerly GISB)
• NAFTA—North American Free Trade Agreement
• NAICS—North American Industry Classification System
• NAP—National Renewable Energy Action Plan
• NARUC—National Association of Regulatory Utility Commissioners (US)
• NAS—United States National Academy of Sciences
• NASPI—North American Synchrophasor Initiative
• NASUCA—National Association of Utility Consumer Advocates(US)
• NATC—Non Recallable Available Transfer Capability
• NBS—National Bureau of Standards (US)
• NCD—Non coincidental Demand
• NCEP—National Council on Electricity Policy (US)
• NCSL—National Conference of State Legislatures (US)
• NEA—The National Energy Act of 1978 (US)
• NEB—National Energy Board (Canada)
• NEDRI—New England Distributed Resources Initiative (US)
• NEM—Net energy metering (US)
• NEPA—National Environmental Policy Act (US)
• NEPOOL—New England Power Pool
• NERC—North American Electric Reliability Council
• NGA—Natural Gas Act (US)
• NGAA—Natural Gasoline Association of America (US)
• NGL—natural gas liquids
• NGPA—Natural Gas Policy Act of 1978 (US)
• NGPL—Natural gas plant liquids
• NGPSA—Natural Gas Pipeline Safety Act of 1968 (US)
• NGSA—Natural Gas Supply Association (US)
• NGV—Natural gas vehicle
• NHPA—National Historic Preservation Act (US)
• NIETC—National Interest Electric Transmission Corridor (US)
• NITC—Normal Incremental Transfer Capability
• NIMBY—Not in my backyard regarding siting of energy generation and transmission infrastructure.
• NOAA—National Oceanic and Atmospheric Administration (US)
• NOC—National Oil Company
• NOI—Notice of Intent or Notice of Inquiry or Notice of Investigation
• NOPR—Notice of Proposed Rulemaking (US)
• NORDEL—association of Nordic electric system operators, comprising Denmark, Finland, Norway, Sweden
• NOx—nitrogen oxides
• NPCC—Northeast Power Coordinating Council (US)
• NPV—Net Present Value
• NRC—Nuclear Regulatory Commission (US)
• NRCS—National Resource Conservation Service (US)
• NRECA—National Association of Rural Electric Cooperatives (US)
• NREL—National Renewable Energy Laboratory (US)
• NREPA—National Resource and Environmental Protection Act (US)
• NRI—National Rivers Inventory (US)
• NRIS—Network Resource Interconnection Service (electricity)
• NSA—Noise sensitive area
• NTAC—Northwest Transmission Assessment Committee (US)
• NUG—Non Utility Generator
• NURE—national uranium resource evaluation (US)
• NYDER—New York Department of Environmental Resources
• NYISO—New York Independent System Operator, Inc. (US)
• NYMEX—New York Mercantile Exchange
• NYPSC—New York Public Service Commission
• NYSERDA—New York State Energy Research and Development Authority

• O&M—Operation and Maintenance Expenses
• O₃—Ozone
• OASIS—Open Access Same-Time Information System
• OATI-Open Access Technology International (US energy software company)
• OATT—Open Access Transmission Tariff (US)
• OCS—Outer Continental Shelf (oil and wind resources)
• OCSLA—Outer Continental Shelf Lands Act (oil)
• OECD—Organisation for Economic Co-operation and Development
• OEM—original equipment manufacturers
• OFO—Operational Flow Order
• OMP—Operation and Maintenance Plan
• Ontario—IESO Ontario Independent Electricity System Operator (Canada)
• OPEC—Organization of Petroleum-Exporting Countries (oil)
• OPRG—oxygenated fuels program reformulated gasoline (oil)
• OREC-ocean resource energy credits
• ORNL—Oak Ridge National Laboratory (U.S.) (nuclear)
• OSHA—U.S. Department of Labor Occupational Safety and Health Administration
• OTAG—Ozone Transport Assessment Group
• OTDF—Outage Transfer Distribution Factor
• OTEC—ocean thermal energy conversion (electricity)

• PA—Planning Authority
  • —Programmatic Agreement
• PADD—Petroleum Administration for Defense Districts (US)
• PBR
  • —pebble bed reactor (nuclear)
  • —performance based rates (electricity)
  • —Performance-based regulation
• PCB—polychlorinated biphenyl
• PCM—Project Cycle Management
• PCS—Power conversion system, electric power conversion
• PCT—Programmable Communicating Thermostat (electricity)
• PD—Preliminary Determination
• PDC—Phasor data concentrator. See description in phasor measurement unit article. (electricity)
• PDCI—Pacific Direct Current Intertie (US) (electricity)
• PEM—Proton Exchange Membrane
• PFC—perfluorocarbons
• PG&E—Pacific Gas & Electric (US) (electricity)
• PGA—Purchased gas adjustment
• PHA—Production Handling Agreement
• PHFFU—Plant held for future use
• PIDX—Petroleum Industry Data Exchange (oil)
• PIER—Public Interest Energy Research (CEC)
• PIFUA—Powerplant and Industrial Fuel Use Act of 1978
• PJM—PJM Interconnection, LLC, a regional transmission organization. (US) (electricity)
• PLC—Power line communication (electricity)
• PLMA—Peak Load Management Association (US) (electricity)
• PM—Particulate matter
• PM&E—Protection, mitigation and enhancement
• PMA—Power Marketing Administration or Fed. Power Marketing Agency (US) (electricity)
• PMU—Phasor measurement unit (electricity)
• PNNL—Pacific Northwest National Laboratory (DOE) (US)
• POD—Point of Delivery
• PoE—Power over Ethernet
• POLES—Prospective On Long Term Energy Systems
• POLR—Provider of last resort (electricity)
• PPA—Power Purchase Agreement (electricity)
• PPI—producer price index
• ppmv—Parts Per Million by Volume
• ppp—Purchasing power parity
• PPR—Potential peak reduction
• PREP—Pacific Regional Energy Programme
• PRESSEA—Promotion of Renewable Energy Sources in South East Asia (PRESSEA)
• Prim—Primary (electricity) nuclear, hydro, geothermal, wind, solar
• PSC—Public Service Commission
• PSD—Prevention of Significant Deterioration
• PSE—Puget Sound Energy (US) (electricity)
• PSoC—Partial State of Charge, operational mode of grid supporting batteries able to respond to both demand and excess production, see UltraBattery
• PTDF—Power Transfer Distribution Factor (electricity)
• PTP—Point to Point Transmission Service (electricity)
• PUC—Public Utility Commission (electricity)
• PUD—Public Utility District (electricity)
• PUHCA—Public Utility Holding Company Act of 1935 (US) (electricity)
• PURPA—Public Utility Regulatory Policies Act of 1978 (US) (electricity)
• PV—photovoltaic (solar)
• PVC—photovoltaic cell (solar)
• PVC—polyvinyl chloride
• PWR—pressurized water reactor (nuclear)
• PX—Power exchange

• QF—qualifying facility
• QSE—Qualifying scheduling entity
• QUAD—10¹⁵ Btu (a quadrillion in the short scale)

• R/P—Reserve on Production
  • —Reserves to Production
• RAB—Regional Advisory Body (US)
• RAC—Refiners' acquisition cost
• RAP—Regulatory Assistance Project
• RAR—Reasonable assured resources
• RAS—Remedial Action Scheme
• RATC—Recallable Available Transmission Capability
• RBMK—Russian: Реактор Большой Мощности Канальный = "High Power Channel Type Reactor" (RU)
• RBOB—reformulated gasoline blendstock for oxygenate blending
• RC—Reliability Coordinator
• RCIS—Reliability Coordinator Information System
• RCRA—Resource Conservation and Recovery Act (US)
• RDF—refuse derived fuel (electricity)
• REA—Rural Electrification Administration (US)
• REC—Renewable energy credit (US)
• RECS—Residential Energy Consumption Survey (US)
• REEEP—Renewable Energy and Energy Efficiency Partnership
• RER—Renewable Energy Rider
• RES—Renewable energy source
• RET/EE—IAF Renewable Energy Technology & Energy Efficiency Investment Advisory Facility
• RF—Radio frequency
• RFA—Regulatory Flexibility Act (US)
• RFC—ReliabilityFirst Corporation (US) (electricity)
• RFG—reformulated gasoline (oil)
• RFI—Request for Interchange
• RFP—Request for proposals
• RGGI—Regional Greenhouse Gas Initiative
• RGS—Renewable Generating System
• RM—Rulemaking
• RMATS—Rocky Mountain Area Transmission Study (US) (electricity)
• RMR—Reliability Must Run (electricity)
• RMU—Removal Units
• ROA—Return of Assets (finance)
• ROE—Return of Equity (finance)
• ROFR—Right of First Refusal (finance)
• ROI—Return on Investment
• ROW—Right of Way
• RPM—Reliability Pricing Model. See explanation in electricity market#Electricity market experience. (electricity)
• RPS—Renewable Portfolio Standards (US)
• RRO—Regional reliability organization (US)
• RSE—Revenue Stream Estimate (finance)
• RSE—relative standard error
• RTBM—Real-Time Balancing Market (electricity)
• RTEP—Regional transmission expansion plan
• RTG—Regional Transmission Group (US)
• RTO—Regional transmission organization (US)
• RTP—Real time Pricing
• RTU—Remote Terminal Unit
• RUS—Rural Utilities Service
• RVP—Reid vapor pressure

• SCADA—Supervisory control and data acquisition a remote control and telemetry system used to monitor and control the electrical system
• SCE—Southern California Edison (US)
• SCE&G—South Carolina Electric & Gas (US)
• scf—Standard cubic foot
• SCO—Stranded Cost Obligation (finance)
• SCR—Special Case Resources (US- NYISO category)
• SCR—Selective Catalytic Reduction
• SDG&E—San Diego Gas & Electric (US)
• SEA—Strategic Environmental Assessment
• SEC—Securities and Exchange Commission (US)
• SEER—seasonal energy efficiency ratio
• SEFI—Sustainable Energy Finance Initiative
• SEIA—Sustainable Energy Industry Association
• Seams—Interconnections Seam Study
• SEPA—Smart Energy Power Alliance
• SERC—Southeastern Electric Reliability Council (US)
• SF₆—sulfur hexafluoride
• SFC—Solid oxide fuel cell (transportation)
• SFEIS—Supplemental Final Environmental Impact Statement (US)
• SFV—Straight Fixed Variable
• SGR—State game refuge (US)
• SHPO—State Historic Preservation Office (US)
• SI—International System of Units (Système international d'unités)
• SIC—Standard Industrial Classification
• SMES—Superconducting magnetic energy storage
• SMPs—Special Marketing Programs
• SNG—Synthetic Natural Gas or Substitute Natural Gas
• SO₂—Sulfur dioxide
• SoC—State of charge of rechargeable battery
• SoH—State of health of rechargeable battery
• SOL—System Operating Limit
• SPCC—Spill Prevention, Containment and Countermeasure Plan
  • SPM—Synchronized phasor measurement- a WAMS network with synchrophasor sensors (PMUs). (electricity)
• SPP—Southwest Power Pool Inc., a regional transmission organization (US)
  • —Statewide Pricing Pilot (US-California)
  • —Small power producer (electricity)
• SPR—Strategic Petroleum Reserve (US)
• SPS—Special Protection System
• SR—Speculative resources For example, regarding uranium deposits. (nuclear)
• SRP—Salt River Agricultural Improvement & Power District (US) (electricity)
• SSG—WI PWG Seams Steering Group of Western Interconnection PlanningWork Group (US) (electricity)
• SSM—Synchronized system measurement-a WAMS with synchronous sensors in addition to PMUs. See Phasor networks.
• STEP—Southwest Transmission Expansion Plan group (US) (electricity)
• SVC—Static VAR compensator (electricity)
• SVEC—Shenandoah Valley Electric Cooperative
• SWAT—Southwest Area Transmission (US) (electricity)
• SWU—Separative work unit

• TAME—Tertiary amyl methyl ether
• TAPS—Trans-Alaska Pipeline System (natural gas)
• TBA—tertiary butyl alcohol
• TBL—transmission business line (electricity)
• TBS—town border station
• Tcf—Trillion cubic feet (measurement)
• TCR—Transition cost recovery (mechanism)
• TDU—Transmission Dependent Utility (electricity)
• TEFRA—Tax Equity and Fiscal Responsibility Act of 1985
• TEN—Trans-European Networks (electricity)
• TLR—Transmission Line Loading Relief Procedures (electricity)
• TO—Transmission owner (electricity)
• toe—Ton of oil equivalent (EU)
• TOP—transmission operator (electricity)
• TOU—time of use (rate) (electricity)
• Transco—transmission company (US) (electricity)
  • —Transcontinental Pipeline (US) (natural gas)
  • —National Transmission Corporation (Philippines)
• TRM—Transmission reliability margin (electricity)
• TSO—Transmission system operator) (electricity)
• TSR—Transmission service request (electricity)
• TTC—Total transfer capability (electricity)
• TVA—Tennessee Valley Authority (US) (electricity)
• TW—terawatt (one trillion watts) (measurement)
• TWH—terawatt-hour (one trillion watt hours)
• T&D—Transmission and distribution

• U.S.C.—United States Code
• U₃O₈—triuranium octaoxide (nuclear)
• UAE—United Arab Emirates (oil)
• UCAP—Unforced Capacity (electricity)
• UCTE—Union for the Coordination of the Transport of Electricity, the power transmission system of continental Europe
• UF₆—uranium hexafluoride (nuclear)
• UFLS—Under frequency load shedding (electricity)
• UHVAC—ultra-high-voltage alternating current (electricity)
• UHVDC—ultra-high-voltage direct current (electricity)
• ULCC—Ultra Large Crude Carrier (oil)
• UMTRA—Uranium Mill Tailings Radiation Control Act of 1978 (US)
• UNCCD—United Nations Convention to Combat Desertification
• UNDESA—UN Department of Economic and Social Affairs
• UNDP—United Nations Development Programme
• UNDP—United Nations Development Programme
• UNECE—United Nations Economic Commission for Europe
• UNEP—United Nations Environment Programme
• UNFCCC—United Nations Framework Convention on Climate Change
• UO₂—uranium dioxide (nuclear)
• UO₃—uranium trioxide (nuclear)
• UO₄—uranyl peroxide (nuclear)
• UOX—uranium oxide (nuclear)
• URR—Ultimate Recoverable Resources
• USBR—United States Bureau of Reclamation
• USCE—United States Army Corps of Engineers
• US DOE—United States Department of Energy
• USGS—United States Geological Survey
• UVLS—under voltage load shedding (electricity)

• V—Volt (measurement)
• VA—Volt-ampere (measurement)
• var—Volt-ampere reactive (measurement)
• VAWT—vertical axis wind turbine (wind)
• VIN—vehicle identification number (US) (transportation)
• VLCC—very large crude carrier (oil)
• VMT—vehicle miles traveled (transportation)
• VOC—volatile organic compound
• VPP—Variable peak pricing (electricity)
• VSA—Voltage stability analysis

• W—Watt
• WACOG—weighted average cost of gas
• WAMS—Wide area measurement system, also Wide area monitoring system - see description in phasor measurement unit article. (electricity)
• WCMC—World Conservation Monitoring Centre
• WCRE—World Commission on Renewable Energy
• WEA—World Energy Assessment
• WEC—World Energy Council
• WECC—Western Electricity Coordinating Council (US)
• WEI—Western Electric Institute (US)
• WEEA—World Energy Efficiency Organization
• WH—watthour (measurement)
• WHO—World Health Organization
• WIRAB—Western Interconnection Regional Advisory Body (US)
• WRI—World Resources Institute
• WSCC—Western Systems Coordinating Council (US)
• WSPP—Western Systems Power Pool (US)
• WSSD—World Summit on Sustainable Development
• WTG—Wind turbine generator (wind)
• WTI—West Texas Intermediate (US)
• WTP—Willingness to pay
• WY—Water Year (measurement)

The following table lists a number of terms that are used in the United States for residential energy audits.

• AFUE—annual fuel utilization efficiency
• BTL—building tightness limit (building tightness)
• CDH—cooling degree hours (climate)
• CFL—compact fluorescent light
• COP—coefficient of performance
• CRI—color rendering index
• EEM—Energy Efficient Mortgage
• EER—energy efficiency ratio
• EF—energy factor (clothes washers)
• EIM—Energy Improvement Mortgage
• ERV—energy-recovery ventilator
• HDD—heating degree day
• HHI—home heating index
• HID—high-intensity discharge
• HRV—heat-recovery ventilator
• HSPF—heating seasonal performance factor
• HVI—Home Ventilating Institute
• IECC—International Energy Conservation Code
• K-value—thermal conductance
• Low-e—low emissivity
• LEED—Leadership in Energy and Environmental Design, standard for Green Building design
• MEF—modified energy factor (clothes washers)
• MINHERS—Mortgage Industry National Home Energy Rating Systems Standards
• MVG—minimum ventilation guideline (building tightness)
• MVL—minimum ventilation level (building tightness)
• NAECA—National Appliance Energy Conservation Act
• ODS—oxygen depletion sensor
• RESNET—Residential energy services network
• R-value—thermal resistance
• SC—shading coefficient (windows)
• SEER—seasonal E efficiency ratio
• SHGC—solar heat gain coefficient
• SIR—savings-to-investment ratio (energy conservation investments)
• SLA—Specific leakage area
• SPB—Simple Payback (energy conservation investments)
• SSE—steady-state efficiency
• U-value—thermal transmittance (also called U-factor)
• WF—water factor (clothes washers)

• Acronym
• Lists of abbreviations

• "Technology Acronyms and Abbreviations". All Acronyms. Retrieved 2008-11-27.
• "Energy Information Agency list of acronyms". Energy Information Administration. Retrieved 2008-11-27.
• "Federal energy regulatory commission- Help- acronyms". Federal Energy Regulatory Commission. Retrieved 2008-11-27.
• "World energy, technology and climate policy outlook- list of acronyms" (PDF). European Commission. Retrieved 2008-11-27.
• "Distributed Power Generation in Europe: technical issues for further integration- list of acronyms" (pdf). European Commission. Retrieved 2008-12-01.