D
- Dam
- Day-Ahead and Hour-Ahead Markets
- Day-ahead Schedule
- Daylighting Controls
- Deadweight Tons (DWT)
- Dealer Tank Wagon (DTW)
- Dealer Tank Wagon (DTW) Sales
- Decatherm
- Decommissioning
- Decontamination
- Dedicated Energy Crops
- Dedicated Reserves
- Dedicated Vehicle
- Deepest Total Depth
- Deferred Cost
- Deferred Fuel Costs
- Deferred Fuel Costs (DFC)
- Deferred Income Tax (Liability)
- Deforestation
- Degasification System
- Degradable Organic Carbon (DOC)
- Degree Day
- Delayed Coking
- Deliverability
- Delivered (Gas)
- Delivered Cost
- Delivered Energy
- Deliveries (Electric)
- Demand
- Demand Bid
- Demand Charge
- Demand Charge Credit
- Demand Indicator
- Demand Interval
- Demand Response Programs
- Demand Response Programs (DR Programs)
- Demand Side Management (DSM)
- Demand-Metered
- Demand-side Management (DSM)
- Demand-side Management Costs
- Demand-side Management Costs (DSM Costs)
- Demonstrated Reserve Base (Coal)
- Demonstrated Reserves
- Demonstrated Resources
- Demonstration and Test Vehicles
- Demurrage
- Denaturant
- Denatured
- Denatured Ethanol
- Densified Biomass Fuel
- Department of Energy (DOE)
- Dependable Capacity
- Depleted Resources
- Depleted Storage Field
- Depletion (Coal)
- Depletion Allowance
- Depletion Factor
- Depreciation
- Depreciation and Amortization of Property, Plant, and Equipment
- Depth of Deepest Production
- Derate
- Deregulation
- Deregulation in Energy
- Design Electrical Rating (Capacity) Net
- Design Head
- Desulfurization
- Development
- Development (Phase)
- Development and Reserves Board (DRB)
- Development Costs
- Development Drilling
- Development Well
- Diesel Fuel
- Diesel Fuel System
- Diesel-Electric Plant
- Diffusive Transport
- Diluent
- Direct Access
- Direct Control Load Management (DCLM)
- Direct Current (DC)
- Direct Electricity Load Control
- Direct Electricity Load Control (DELC)
- Direct Labor Hours
- Direct Load Control (DLC)
- Direct Milling Cost
- Direct Mining Cost
- Direct Nonprocess End Use
- Direct Process End Use
- Direct Use
- Direct Utility Cost
- Direct-use Energy
- Directional (Deviated) Well
- Discharged Fuel
- Discrete-delivery Energy Sources
- Dispatching
- Disposable Income
- Disposition, Natural Gas
- Disposition, Petroleum
- Distillate Fuel Oil
- Distillation Unit (Atmospheric)
- Distributed Generator
- Distributed/Point-of-Use Water-Heating System
- Distribution
- Distribution Provider (Electric)
- Distribution System
- Distribution Use
- Distributor
- District Chilled Water
- District Energy
- District Heat
- Diversity
- Diversity Exchange
- Divestiture
- Docket
- Domestic
- Domestic Crude Oil
- Domestic Inland Consumption
- Domestic Uranium Industry
- Domestic Vehicle Producer
- Double Circuit Line
- Drainage Basin
- Drawdown
- Drawdown (Maximum)
- Dredge Mining
- Drift Mine
- Drilling
- Drilling and Equipping of Wells
- Drilling Arrangement
- Dry (Coal) Basis
- Dry Bottom Boiler
- Dry Gas
- Dry Hole
- Dry Hole Charge
- Dry Hole Contribution
- Dry Natural Gas
- Dry Natural Gas
- Dry Natural Gas Production
- Dry Production
- Dual Fuel Vehicle
- Dual-Fired Unit
- Dump Energy