List of energy abbreviations

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

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—generation control
AGD—Associated Gas Distributors
AIEE—American Institute of Electrical Engineers
AIMA—Agricultural Impact Mitigation Agreement
ALARP—as low as reasonably practicable
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
AOB—Any Other Business
AOS—authorized overrun service
AP—action point
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 (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
BESS—Battery Energy Storage System
BfP—Bureau Fédéral du Plan.
BIPS—Bulk Independent Power System
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
BPCS—Basic Process Control System
BPL—Broadband over power line
BPS—Bulk Power System
BTMG—Behind The Meter Generation
BTU—British thermal unit
BTU—Board of Trade 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.
CAM—Compact Auxiliary Module
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
CCF—Common Cause Failure
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
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"
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
CGR—Charge Gas Recirculation, Compact Gas Ramp
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
CW—Cooling Water
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
DD—Dangerous Detected
DEFG—Distributed Energy Financial Group
DEIS—Draft Environmental Impact Statement
DER—Distributed Energy Resources
DERMS—Distributed Energy Resource Management Systems
DF—Distribution Factor, Dual-Fuel
DG—Distributed generation
*—Directorate-General
DIIS—Danish Institute for International Studies
DLC—Direct load control
DME—Disturbance Monitoring Equipment
DO—Dissolved oxygen
DoD—Depth of discharge, energy drawn from a battery
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
DPI—Differential Pressure Indicator
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
DU—Dangerous Undetected

E

E&D—Exploration and development expenses
E/E/PE—Electrical/Electronic/Programmable Electronic
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
*—Energy Efficiency Index for European Union energy labels
EEQ—Engineered Equipment
EERS—Energy Efficiency Resource Standards
EF—Earth Fault
EGHE—Exhaust Gas Heat Exchanger
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
EPC—Engineering, Procurement and Construction
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
ESM—Engine Safety Module
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
EUC—Equipment Under Control
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
FAT—Factory Acceptance Testing
FBD—Function Block Diagram
FBR—fast breeder reactor
FCITC—First Contingency Incremental Transfer Capability
FE—Final Element
FEIS—Final Environmental impact statement
FELCC—Firm Energy Load Carrying Capability
FERA—Fire and Explosion Risk Assessment
FERC—Federal Energy Regulatory Commission
FG—Fuel Gas
FGD—Flue-gas desulfurization
FGSU—Fuel Gas Supply Unit
FINESSE—Financing Energy Services for Small Scale Users
Fishway—Fish ladder
FLD—Functional Logic Diagram
FLPMA—Federal Land Policy and Management Act
FME—Free market economics
FMEA—Failure Modes and Effects Analysis
FONSI—Finding of no significant impact. See Environmental impact statement
FPA—Federal Power Act
FPC—Federal Power Commission
FPL—Fixed Program Language
FPS—Firm peaking service. See Peaking power plant
FRCC—Florida Reliability Coordinating Council
FRS—Financial Reporting System
FS—Functional Safety
FSA—Functional Safety Assessment
FSD—Functional Safety Deliverables
FSM—Functional Safety Management, Functional Safety Manager
FSMS—Functional Safety Management System
FT—Firm Transportation Service
FTA—Fault Tree Analysis
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
FVL—Full Variability Language
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
GCB—Generator Circuit Breaker
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 (electricity). Also known as a TransCo
GSF—Generator to Load Distribution Factor. See Load balancing
GPE—gravitational potential energy
GPRS—Gas Pressure Reduction System
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

H&RA—Hazard And Risk Analysis
HAZOP—Hazard And Operability Study
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
HMI—Human Machine Interface
hp—Horsepower
HRSG—Heat recovery steam generation
HS—Hardware Safety proof test frequency
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
IEC—International Electrotechnical Commission
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
IPF—Independent Protection Function
IPL—Independent Protection Layer
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
KPI—Key Performance Indicator
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 (ERCOT category)
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
LE—Latest Estimate
LED—Light Emitting Diode
LEL—Lower Explosion Limit
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
LO—Lube Oil
LOC—Lube Oil Cooler
LODF—Line Outage Distribution Factor
LOLE—Loss of load expectation
LOLP—Loss of load probability
LOPA—Layer of Protection Analysis
LOTO—Lockout / tagout.
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
LVL—Limited Variability Language
LWR—light water reactor

M

MAAC—Mid Atlantic Area Council (US- geographically within PJM)
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
MBOE—One million barrels of oil equivalent
MBR—Market based Rates
MBS—Macro economic Budget Support
MBU—Main Breaker Unit
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
MEDREG—Mediterranean Energy Regulators
MEDREP—Mediterranean Renewables Energy Partnership
MER—Maximum efficient rate
MERC—Mobile Emission Reduction Credit (MERC)
MFS—Minimum Functional Specification
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
MoC—Management of Change
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
MRT—Mean Repair Time
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 (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
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
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
OATT—Open Access Transmission Tariff
OCGT—Open Cycle Gas Turbine
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 (U.S.)
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

P&ID—Piping & Instrumentation Diagram
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, electric power conversion. Plant Control System.
PCT—Programmable Communicating Thermostat, Production Conformity Test
PD—Preliminary Determination
PDC—Phasor data concentrator. See description in phasor measurement unit article.
PDCI—Pacific Direct Current Intertie
PDT—Pressure Differential Transmitter
PE—Programmable Electronic
PERC—Passivated Emitter Rear Contact
PEM—Proton Exchange Membrane
PFC—perfluorocarbons
PFD—Probability of Failure on Demand
PFDavg—Average Probability of Failure on Demand
PFH—Probability of Failure per Hour
PG&E—Pacific Gas & Electric
PGA—Purchased gas adjustment
PHA—Production Handling Agreement, Process Hazard Analysis
PHFFU—Plant held for future use
PIDX—Petroleum Industry Data Exchange
PIER—Public Interest Energy Research (CEC)
PIFUA—Powerplant and Industrial Fuel Use Act of 1978
PIU—Proven In Use
PJM—PJM Interconnection, LLC, a regional transmission organization.
PLC—Power line communication, Programmable Logic Controller
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 (DOE)
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 (electricity) nuclear, hydro, geothermal, wind, solar
PSC—Public Service Commission
PSD—Prevention of Significant Deterioration
PSE—Puget Sound Energy
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
PTP—Point to Point Transmission Service
PUC—Public utilities 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
QRA—Quantitative Risk Assessment
QSE—Qualifying scheduling entity
QUAD—10¹⁵ Btu

R

R/P—Reserve on Production
*—Reserves to Production
RA—Risk Assessment
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
RCM—Reliability-Centered Maintenance
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#Deregulated market experience.
RPN—Risk Priority Number
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 (US- NYISO category)
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
Seams—Interconnections Seam Study
SEPA—Smart Energy Power Alliance
SERC—Southeastern Electric Reliability Council
SERH—Safety Equipment Reliability Handbook
SF—Safe Failure
SF₆—sulfur hexafluoride
SFC—Solid oxide fuel cell
SFEIS—Supplemental Final Environmental Impact Statement
SFF—Safe Failure Fraction
SFV—Straight Fixed Variable
SG—Spark-ignited Gas
SGR—State game refuge
SHPO—State Historic Preservation Office
SI—International System of Units (Système international d'unités)
SIC—Standard Industrial Classification
SIF—Safety Instrumented Function
SIL—Safety Integrity Level
SIS—Safety Instrumented System
SLC—Safety Life Cycle
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.
SPP—Southwest Power Pool Inc., a regional transmission organization
*—Statewide Pricing Pilot (US-California)
*—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
SRS—Safety Requirements Specification
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.
SSOV—Safety ShutOff Valve
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
TF—Test frequency
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
TMEL—Target mean time between failures
TO—Transmission owner
toe—Ton of oil equivalent
TOP—transmission operator
TOU—time of use (rate)
Transco—transmission company
*—Transcontinental Pipeline
*—National Transmission Corporation
TRM—Transmission reliability margin
TS—Two-stage
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
UD—Useful Diagnostic coverage
UF₆—uranium hexafluoride
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

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

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
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