List of energy abbreviations

This is a list of acronyms found in the context of energy issues.

A

 * 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)

B

 * 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)
 * BTU—Board of Trade unit (1 kWh) (UK historical)
 * 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

 * 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
 * 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
 * CDR—Carbon dioxide removal
 * 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

D

 * 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

 * 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
 * —Energy Efficiency Index for European Union energy labels
 * 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

F

 * 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

 * 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)

H

 * 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

 * 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)

J

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

K

 * 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)

L

 * 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)
 * LOLP—Loss of load probability (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

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
 * 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
 * MEDREG—Mediterranean Energy Regulators
 * 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)

N

 * 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
 * NIMYBY- Not In My BackYard

O

 * 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)

P

 * 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)
 * PERC—Passivated Emitter Rear Contact (type of PV cell)
 * 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 utilities 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

Q

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

R

 * 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)
 * 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

S

 * 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

T

 * 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

 * 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

 * 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

 * 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)

Appendix: Residential energy acronyms
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)