List of energy abbreviations

A

• AAQS—Ambient Air Quality Standards
• AAU—Assigned amount units
• ABT—Availability based tariff
• ABF—Aquatic Base Flow
• AC—Alternating current
• ACA—Annual Charge Adjustment
• ACE—Area Control Error
• ACEEE—American Council for an Energy-Efficient Economy
• ACRS—Accelerated Cost Recovery System
• ADITC—Accumulated Deferred Investment Tax Credit
• ADR—Asset Depreciation Range
• AEP—American Electric Power
• 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
• AIEE—American Institute of Electrical Engineers
• AIMA—Agricultural Impact Mitigation Agreement
• 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
• API—American Petroleum Institute
• APPA—American Public Power Association
• APR—Actual peak reduction
• AQCR—Air Quality Control Region
• ARA— ports of Amsterdam – Rotterdam – Antwerp
• ARR—Auction Revenue Rights
• 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

  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
• *—Balgzand Bacton Line
• BCD—Barrel per day, on calendar days
• BCF—billion cubic feet
• BCP—Blackstart Capability Plan
• BES—Bulk electric system
• BfP—Bureau Fédéral du Plan.
• 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
• BPA—Bonneville Power Administration
• BPL—Broadband over power line
• BPS—Bulk Power System
• BTMG—Behind The Meter Generation
• BTU—British thermal unit
• BTX—from BTX process, a mixture of benzene, toluene, and xylene
• BuRec—United States Bureau of Reclamation
• BWR—Boiling water reactor

  C

• C&I—Commercial and industrial customers
• CA—Carbon Abatement- increasing carbon-neutrality
• *—Control area – The portion of the generation and transmission system controlled by a single transmission system operator..
• CAA—Clean Air Act
• CAEM—Center for the Advancement of Energy Markets
• CAES—Compressed Air Energy Storage
• CAFE—Corporate Average Fuel Economy standards
• CAISO—California Independent System Operator Corporation, a regional transmission organization.
• 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
• 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
• 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"
• CERCLIS—Comprehensive Environmental Response, Compensation, and Liability Information System
• CERTS—Consortium for Electric Reliability Technology Solutions sponsored by the United States Department of Energy and California Energy Commission
• 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
• *—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
• CPUC—California Public Utilities Commission
• CREF—Caribbean Renewable Energy Facility
• CRP—Conservation Reserve Program
• CRT—Capacity Reservation Tariff
• CSD—Commission for Sustainable Development
• CSEM—Center for the Study of Energy Markets
• CSP—Country Strategy Paper
• *—Curtailment service provider
• CT—Combustion turbine
• 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
• DC—Direct current
• DCLM—Direct control load management
• DCS—Disturbance Control Standard
• DEFG—Distributed Energy Financial Group
• DEIS—Draft Environmental Impact Statement
• DER—Distributed Energy Resources
• DERMS—Distributed Energy Resource Management Systems
• DF—Distribution Factor
• DG—Distributed generation
• *—Directorate-General
• DIIS—Danish Institute for International Studies
• DLC—Direct load control
• DME—Disturbance Monitoring Equipment
• DO—Dissolved oxygen
• DOE—United States Department of Energy
• DOE/FE—United States Department of Energy Office of Fossil Energy
• DOI—United States Department of the Interior
• DOT—United States Department of Transportation
• DP—Distribution point
• DR—Demand response
• DRAM—Demand Response and Advanced Metering Coalition
• DRB—Demonstrated reserve base
• DRCC—Demand Response Coordinating Council
• DRR—Demand Response resources
• DRRC—Demand Response Research Center
• DSM—Demand side management
• DSO—Distribution system operator
• Dth—Dekatherm
• DTW—dealer tank wagon

  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
• EPCIP—European Programme for Critical Infrastructure Protection
• ECPA—Electric Consumers Protection Act
• EDC—Electric Distribution Company
• 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
• *—Environmental impact assessment
• EIB—European Investment Bank
• EIM—Energy Imbalance Market
• EIPP—Eastern Interconnection Phasor Project
• EIS—Environmental Impact Statement
• 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
• *—Energy Policy Act of 2005
• EPRI—Electric Power Research Institute
• EPSA—Electric Power Supply Association
• EQR—Electric Quarterly Report
• ERA—Economic Regulatory Administration
• ERGEG—European Regulators Group for Electricity and Gas
• ERIS—Energy Resource Interconnection Service
• 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
• 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
• FELCC—Firm Energy Load Carrying Capability
• FERC—Federal Energy Regulatory Commission
• FGD—Flue-gas desulfurization
• FINESSE—Financing Energy Services for Small Scale Users
• Fishway—Fish ladder
• FLPMA—Federal Land Policy and Management Act
• FME—Free market economics
• FONSI—Finding of no significant impact. See Environmental impact statement
• FPA—Federal Power Act
• FPC—Federal Power Commission
• FPS—Firm peaking service. See Peaking power plant
• FRCC—Florida Reliability Coordinating Council
• FRS—Financial Reporting System
• FT—Firm Transportation Service
• FTC—Federal Trade Commission
• FTR—Firm Transmission Rights
• *—Financial Transmission Rights. See explanation in electricity markets.
• FTS—Firm transportation service
• FUA—The Fuel Use Act
• FUCO—Foreign Utility Company
• FWPA—Federal Water Power Act

  G

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

  H

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

  I

• I/C—Interruptible /Curtailable
• ICAP—Installed Capacity
• ICAP-SCR—Installed capacity special case resources
• ICCP—Inter-Control Center Communications Protocol
• ICE—Internal combustion engine
• ICT—Independent Coordinator of Transmission
• *—Information and Communication Technology
• IDC—Interchange Distribution Calculator
• IEA—International Energy Agency
• IEM—Internal electricity market
• IEEE—Institute of Electrical and Electronics Engineers
• IEPE—Institute of Energy Policy and Economics
• IER—Incremental Energy Rate
• IET—International emission trading
• IGCC—Integrated coal gasification combined cycle
• IGIC—Interim gas inventory charge
• IGSC—Interim gas supply charge
• IGT—Institute of Gas Technology
• IGU—International Gas Union
• IHR—Incremental Heat Rate- plant monitoring
• 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
• IOU—Investor owned utility
• IPAA—Independent Petroleum Association of America
• IPCC—Intergovernmental Panel on Climate Change
• IPP—Independent Power Producer
• 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
• IROL—Interconnection Reliability Operating Limit
• IRP—Integrated Resource Planning
• IRR—Internal Rate of Return
• ISO—Independent System Operator Responsible for grid management, but does not own assets.
• ISO-NE—Independent System Operator of New England, a regional transmission organization.
• ISO—NE ISO New England, Inc.
• 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.
• ITC—Investment tax credit
• 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.

  J

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

  K

• koe—One kilogram oil equivalent
• kV—Kilovolt
• kVA—One thousand volt Ampere
• kvar—one thousand vars
• kW—Kilowatt
• kWE—kilowatt electric
• kWh—Kilowatt hour

  L

• LaaR—Load acting as a resource
• LBA—Local Balancing Authority
• LBNL—Lawrence Berkeley National Laboratory
• LCOD—Levelized cost of delivery
• LCOE—Levelized cost of energy
• LCOS—Levelized cost of storage
• LDC—Local distribution company
• LED—Light Emitting Diode
• LEVP—Low Emissions Vehicle Program
• LHV—lower heating value
• Li-Ion—Lithium Ion
• LIHEAP—Low Income Home Energy Assistance Program
• LIPA—Long Island Power Authority
• LLF—Load-loss factor
• LMP—Locational marginal price/pricing. See explanation in electricity markets.
• LMR—Load Modifying Resource
• LNG—Liquified Natural Gas
• LODF—Line Outage Distribution Factor
• LOLE—Loss of Load Expectation
• 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
• MADRI—Mid Atlantic Distributed Resources Initiative
• MAIN—Mid America Interconnected Network
• MAOP—Maximum allowable operating pressure
• MAPP—Mid Continent Area Power Pool
• MBD—million barrels per day
• MBOED—One million barrels of oil equivalent
• MBR—Market based Rates
• MBS—Macro economic Budget Support
• Mcf—Roman numeral "M" for one thousand cubic feet
• 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
• MFV—Modified fixed variable rate
• MISO—Midcontinent Independent System Operator, Inc. A regional transmission organization.
• 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
• MMCFD—one million cubic feet per day
• MMGAL—one million gallons
• MMGAL/D—one million gallons per day
• MMS—Minerals Management Service
• MMST—one million short tons
• MODFLOW—model of groundwater flow
• MOU—Memorandum of Understanding
• MOX—mixed oxide fuel
• MPAN - Meter Point Administration Number
• MPG—Miles per gallon
• MRO—Midwest Reliability Organization
• MSA—metropolitan statistical area
• MSHA—Mine Safety and Health Administration
• msl—Mean sea level
• MSW—Municipal solid waste
• Mt—one million tons
• *—one Metric ton
• MTBE—methyl tertiary butyl ether
• MTEF—Medium Term Expenditure Framework
• MTEP—Midwest ISO Transmission Expansion Plan 2005
• Mtoe—One million tons of oil equivalent
• Muni—Municipality
• MVA—Megavolt amperes
• MW—Megawatt
• MWE—megawatt electric
• MWh—Megawatt hour

  N

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

  O

• O&M—Operation and Maintenance Expenses
• O₃—Ozone
• OASIS—Open Access Same-Time Information System
• OATI-Open Access Technology International
• OATT—Open Access Transmission Tariff
• OCS—Outer Continental Shelf
• OCSLA—Outer Continental Shelf Lands Act
• 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
• OPEC—Organization of Petroleum-Exporting Countries
• OPRG—oxygenated fuels program reformulated gasoline
• OREC-ocean resource energy credits
• ORNL—Oak Ridge National Laboratory
• 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

  P

• PA—Planning Authority
• *—Programmatic Agreement
• PADD—Petroleum Administration for Defense Districts
• PBR
• *—pebble bed reactor
• *—performance based rates
• *—Performance-based regulation
• PCB—polychlorinated biphenyl
• PCM—Project Cycle Management
• PCS—Power conversion system
• PCT—Programmable Communicating Thermostat
• PD—Preliminary Determination
• PDC—Phasor data concentrator. See description in phasor measurement unit article.
• PDCI—Pacific Direct Current Intertie
• PEM—Proton Exchange Membrane
• PFC—perfluorocarbons
• PG&E—Pacific Gas & Electric
• PGA—Purchased gas adjustment
• PHA—Production Handling Agreement
• PHFFU—Plant held for future use
• PIDX—Petroleum Industry Data Exchange
• PIER—Public Interest Energy Research
• PIFUA—Powerplant and Industrial Fuel Use Act of 1978
• PJM—PJM Interconnection, LLC, a regional transmission organization.
• PLC—Power line communication
• PLMA—Peak Load Management Association
• PM—Particulate matter
• PM&E—Protection, mitigation and enhancement
• PMA—Power Marketing Administration or Fed. Power Marketing Agency
• PMU—Phasor measurement unit
• PNNL—Pacific Northwest National Laboratory
• POD—Point of Delivery
• PoE—Power over Ethernet
• POLES—Prospective On Long Term Energy Systems
• POLR—Provider of last resort
• PPA—Power Purchase Agreement
• 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
• Prim—Primary nuclear, hydro, geothermal, wind, solar
• PSC—Public Service Commission
• PSD—Prevention of Significant Deterioration
• PSE—Puget Sound Energy
• PTDF—Power Transfer Distribution Factor
• PTP—Point to Point Transmission Service
• PUC—Public Utility Commission
• PUD—Public Utility District
• PUHCA—Public Utility Holding Company Act of 1935
• PURPA—Public Utility Regulatory Policies Act of 1978
• PV—photovoltaic
• PVC—photovoltaic cell
• PVC—polyvinyl chloride
• PWR—pressurized water reactor
• PX—Power exchange

  Q

• QF—qualifying facility
• QSE—Qualifying scheduling entity
• QUAD—10¹⁵ Btu

  R

• R/P—Reserve on Production
• *—Reserves to Production
• RAB—Regional Advisory Body
• 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"
• RBOB—reformulated gasoline blendstock for oxygenate blending
• RC—Reliability Coordinator
• RCIS—Reliability Coordinator Information System
• RCRA—Resource Conservation and Recovery Act
• RDF—refuse derived fuel
• REA—Rural Electrification Administration
• REC—Renewable energy credit
• RECS—Residential Energy Consumption Survey
• 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
• RFC—ReliabilityFirst Corporation
• RFG—reformulated gasoline
• 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
• RMR—Reliability Must Run
• RMU—Removal Units
• ROA—Return of Assets
• ROE—Return of Equity
• ROFR—Right of First Refusal
• ROI—Return on Investment
• ROW—Right of Way
• RPM—Reliability Pricing Model. See explanation in electricity market#Electricity market experience.
• RPS—Renewable Portfolio Standards
• RRO—Regional reliability organization
• RSE—Revenue Stream Estimate
• RSE—relative standard error
• RTBM—Real-Time Balancing Market
• RTEP—Regional transmission expansion plan
• RTG—Regional Transmission Group
• RTO—Regional transmission organization
• 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
• SCE&G—South Carolina Electric & Gas
• scf—Standard cubic foot
• SCO—Stranded Cost Obligation
• SCR—Special Case Resources
• SCR—Selective Catalytic Reduction
• SDG&E—San Diego Gas & Electric
• SEA—Strategic Environmental Assessment
• SEC—Securities and Exchange Commission
• SEER—seasonal energy efficiency ratio
• SEFI—Sustainable Energy Finance Initiative
• SEIA—Sustainable Energy Industry Association
• SEPA—Smart Energy Power Alliance
• SERC—Southeastern Electric Reliability Council
• SF₆—sulfur hexafluoride
• SFC—Solid oxide fuel cell
• SFEIS—Supplemental Final Environmental Impact Statement
• SFV—Straight Fixed Variable
• SGR—State game refuge
• SHPO—State Historic Preservation Office
• SI—International System of Units
• SIC—Standard Industrial Classification
• SMES—Superconducting magnetic energy storage
• SMPs—Special Marketing Programs
• SNG—Synthetic Natural Gas or Substitute Natural Gas
• SO₂—Sulfur dioxide
• SOL—System Operating Limit
• SPCC—Spill Prevention, Containment and Countermeasure Plan
• *SPM—Synchronized phasor measurement- a WAMS network with synchrophasor sensors.
• SPP—Southwest Power Pool Inc., a regional transmission organization
• *—Statewide Pricing Pilot
• *—Small power producer
• SPR—Strategic Petroleum Reserve
• SPS—Special Protection System
• SR—Speculative resources For example, regarding uranium deposits.
• SRP—Salt River Agricultural Improvement & Power District
• SSG—WI PWG Seams Steering Group of Western Interconnection PlanningWork Group
• SSM—Synchronized system measurement-a WAMS with synchronous sensors in addition to PMUs. See Phasor networks.
• STEP—Southwest Transmission Expansion Plan group
• SVC—Static VAR compensator
• SVEC—Shenandoah Valley Electric Cooperative
• SWAT—Southwest Area Transmission
• SWU—Separative work unit

  T

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

  U

• U.S.C.—United States Code
• U₃O₈—triuranium octaoxide
• UAE—United Arab Emirates
• UCAP—Unforced Capacity
• UCTE—Union for the Coordination of the Transport of Electricity, the power transmission system of continental Europe
• UF₆—uranium hexaflouride
• UFLS—Under frequency load shedding
• UHVAC—ultra-high-voltage alternating current
• UHVDC—ultra-high-voltage direct current
• ULCC—Ultra Large Crude Carrier
• UMTRA—Uranium Mill Tailings Radiation Control Act of 1978
• 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
• UO₃—uranium trioxide
• UO₄—uranyl peroxide
• UOX—uranium oxide
• 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

  V

• V—Volt
• VA—Volt-ampere
• var—Volt-ampere reactive
• VAWT—vertical axis wind turbine
• VIN—vehicle identification number
• VLCC—very large crude carrier
• VMT—vehicle miles traveled
• VOC—volatile organic compound
• VPP—Variable peak pricing
• 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.
• WCMC—World Conservation Monitoring Centre
• WCRE—World Commission on Renewable Energy
• WEA—World Energy Assessment
• WEC—World Energy Council
• WECC—Western Electricity Coordinating Council
• WEI—Western Electric Institute
• WEEA—World Energy Efficiency Organization
• WH—watthour
• WHO—World Health Organization
• WIRAB—Western Interconnection Regional Advisory Body
• WRI—World Resources Institute
• WSCC—Western Systems Coordinating Council
• WSPP—Western Systems Power Pool
• WSSD—World Summit on Sustainable Development
• WTG—Wind turbine generator
• WTI—West Texas Intermediate
• WTP—Willingness to pay
• WY—Water Year

  Appendix: Residential energy acronyms

• AFUE—annual fuel utilization efficiency
• BTL—building tightness limit
• CDH—cooling degree hours
• CFL—compact fluorescent light
• COP—coefficient of performance
• CRI—color rendering index
• EEM—Energy Efficient Mortgage
• EER—energy efficiency ratio
• EF—energy factor
• 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
• MINHERS—Mortgage Industry National Home Energy Rating Systems Standards
• MVG—minimum ventilation guideline
• MVL—minimum ventilation level
• NAECA—National Appliance Energy Conservation Act
• ODS—oxygen depletion sensor
• RESNET—Residential energy services network
• R-value—thermal resistance
• SC—shading coefficient
• SEER—seasonal E efficiency ratio
• SHGC—solar heat gain coefficient
• SIR—savings-to-investment ratio
• SLA—Specific leakage area
• SPB—Simple Payback
• SSE—steady-state efficiency
• U-value—thermal transmittance
• WF—water factor