A
- Account Classification
- Account of Others (Natural Gas)
- Accounting System
- Acid Mine Drainage (AMD)
- Acid Rain
- Acquisition (Foreign Crude Oil)
- Acquisition (Minerals)
- Acquisition Costs, Mineral Rights
- Acre-Foot
- Acreage in Oil and Gas Investments
- Active Power
- Active Solar
- Actual Peak Reduction
- Adequacy (Electric)
- Adjustable Speed Drives (ASDs)
- Adjusted Electricity
- Adjustment Bid
- Administrative and General Expenses (A&G Expenses)
- Advance Royalty
- Advanced Fuel Ethanol
- Advanced Metering Infrastructure (AMI)
- Advances from Municipality
- Advances to Municipality
- Adverse Water Conditions
- Adverse Weather Conditions
- Affiliate
- Afforestation
- Aftermarket Converted Vehicle
- Aftermarket Vehicle Converter
- Agglomerating Character
- Aggregate Ratio
- Aggregator
- Agricultural and Forestry Residues
- Agriculture
- Agriculture, Mining, and Construction (Consumer Category)
- Air Cleaner
- Air Collector
- Air Conditioning (AC)
- Air Conditioning Intensity
- Air Pollution Abatement Equipment
- Alcohol
- Alkylate
- Alkylation
- All-electric Home
- All-Electric Vehicle (AEV)
- Allowance for Funds Used During Construction (AFUDC)
- Alternate Energy Source for Primary Heater
- Alternating Current (AC)
- Alternative Fuel
- Alternative Fuel Vehicle (AFV)
- Alternative Fuel Vehicle Converter
- Alternative-Rate DSM Program Assistance
- American Gas Association (AGA)
- American Indian Coal Lease
- American National Standards Institute (ANSI)
- American Petroleum Institute (API)
- Amorphous Silicon (a-Si)
- Amortization
- Ampere (A)
- Amsterdam-Rotterdam-Antwerp (ARA)
- Anaerobic Decomposition
- Anaerobic Lagoon
- Ancillary Services
- Annual Operating Factor
- Annual Requirement
- ANSI Assembly Identifier
- Anthracite Coal
- Anthropogenic
- API Gravity
- Apparent Consumption (Coal)
- Apparent Consumption, Natural Gas (International)
- Apparent Consumption, Petroleum (International)
- Apparent Power (VA)
- Appliance
- Appliance Efficiency Index (AEI)
- Appliance Efficiency Standards
- Arbitrage
- Aromatics
- As Received Coal
- As-received Condition (Coal)
- Asbestos
- Ash
- Asphalt
- Asphalt (Refined)
- Assembly Identifier
- Assembly Type
- Assessment Work
- Asset Condition-Based Maintenance (ACBM)
- Assistance for Heating in Winter
- Assistance for Weatherization of Residence
- Associated Natural Gas
- Associated-Dissolved Natural Gas
- ASTM (American Society for Testing and Materials)
- Atmospheric Crude Oil Distillation
- Atomic Weight (AT WT)
- Auger Mine
- Authorized Cash Distribution to Municipality
- Automatic Meter Reading (AMR)
- Automatic Set-Back or Clock Thermostat
- Automobile and Truck Classifications
- Auxiliary Generator
- Available but Not Needed Capability
- Average Annual Percent Change (Coal)
- Average Daily Production
- Average Delivered Price
- Average Household Energy Expenditures
- Average Mine Price
- Average Number of Employees (coal)
- Average Open Market Sales Price (coal)
- Average Production Per Miner Per Day
- Average Production Per Miner Per Hour
- Average Recovery Percentage (coal)
- Average Revenue Per Kilowatthour (ARPUKWH)
- Average Stream Flow
- Average Vehicle Fuel Consumption
- Average Vehicle Miles Traveled (AVMT)
- Average Water Conditions
- Aviation Gasoline (Finished)
- Aviation Gasoline Blending Components
- Azimuth Angle