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)
- Acc.—Accession countries (to the European Union) (government)
- 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)
- —Alternative dispute resolution
- 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)
- 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)
- 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)
Read more about this topic: List Of Energy Abbreviations