P
- Packaged Air Conditioning Units (PACUs)
- Packaged Units
- Parabolic Dish
- Parabolic Trough
- Paraffin (Oil)
- Paraffin (Wax)
- Paraffinic Hydrocarbons
- Parent and its Consolidated Entities
- Parent Company
- Parent Well
- Partial Requirements Consumer
- Particulate
- Parting
- Passenger-Miles Traveled (PMT)
- Passive Solar Heating
- Payables to Municipality
- Payment Method for Utilities
- Peak Capacity of an LNG Export Facility
- Peak Day Withdrawal
- Peak Demand
- Peak Kilowatt (kW)
- Peak Load
- Peak Load Month
- Peak Load Plant
- Peak Megawatt (MW)
- Peak Watt (Wp)
- Peaking Capacity
- Peat
- Pentanes Plus
- Percent Difference
- Percent Utilization
- Perfluorocarbons (PFCs)
- Perfluorocarbons (PFCs)
- Perfluoromethane (CF4)
- Performance-Based Regulation (PBR)
- Permanently Discharged Fuel
- Permeability
- Persian Gulf
- Person
- Person-Year
- Personal Computer (PC)
- Petrochemical Feedstocks
- Petrochemicals
- Petroleum
- Petroleum Administration for Defense District (PADD)
- Petroleum Administration for Defense Districts (PADDs)
- Petroleum and Other Liquids
- Petroleum Coke (PetCoke)
- Petroleum Coke, Catalyst
- Petroleum Consumption
- Petroleum Exchange
- Petroleum Imports
- Petroleum Jelly
- Petroleum Products
- Petroleum Refinery
- Petroleum Stocks, Primary
- pH (Potential of Hydrogen)
- Photosynthesis
- Photovoltaic (PV)
- Photovoltaic and Solar Thermal Energy
- Photovoltaic Cell (PVC)
- Photovoltaic Cell Net Shipments
- Photovoltaic Cells (PVCs)
- Photovoltaic Module (PV Module)
- Pig Iron
- Pipeline (Natural Gas)
- Pipeline (Petroleum)
- Pipeline Freight
- Pipeline Fuel
- Pipeline Purchases
- Pipeline Quality Natural Gas
- Pipeline, Distribution
- Pipeline, Gathering
- Pipeline, Transmission
- Pipelines, Rate Regulated
- Pitchblende (Uraninite)
- Place in Service
- Planetary Albedo
- Planned Generator
- Planning Authority (Electric)
- Plant
- Plant Condensate
- Plant Hours Connected to Load
- Plant Liquids (NGLs)
- Plant or Gas Processing Plant
- Plant Products
- Plant Use
- Plant-use Electricity
- Play (Oil and Gas)
- Plug-in Electric Vehicle (PEV)
- Plug-in Hybrid Electric Vehicle (PHEV)
- Plugged-back Footage
- Plutonium (Pu)
- Pneumatic Device
- Pole-mile
- Pole/Tower Type
- Polychlorinated Biphenyl (PCB)
- Polystyrene (PS)
- Polyvinyl Chloride (PVC)
- Polyvinyl Chloride (PVC)
- Pondage (Water Storage)
- Pool
- Pool Site
- Population-weighted Degree Days (PWDD)
- Pore
- Pore Space
- Porosity
- Portable Electric Heater
- Portable Fan
- Portable Kerosene Heater
- Post-Mining Emissions
- Potential Consumption
- Potential Peak Reduction (PPR)
- Poultry Fat
- Pound (lb)
- Pounds (District Heat)
- Power
- Power (Electrical)
- Power Ascension
- Power Exchange
- Power Exchange Generation
- Power Exchange Load
- Power Factor
- Power Loss
- Power Marketers
- Power Pool
- Power Production Plant
- Power Transfer Limit
- Powerhouse
- PPE, Additions to
- Prediscovery Costs
- Pregnant Solution
- Preliminary Permit (Hydroelectric Power)
- Premium Gasoline
- Preparation Plant
- Preproduction Costs
- Pressurized Water Reactor (PWR)
- Pressurized-water Reactor (PWR)
- Preventive Maintenance Program for Heating and/or Cooling Equipment
- Price
- Primary Coal
- Primary Energy
- Primary Energy Consumption
- Primary Energy Consumption Expenditures
- Primary Energy Production
- Primary Fuels
- Primary Metropolitan Statistical Area (PMSA)
- Primary Recovery
- Primary Transportation
- Prime Mover
- Prime Supplier
- Private Fueling Facility
- Privately Owned Electric Utility
- Probable Energy Reserves
- Probable Reserves, Coal
- Process Cooling and Refrigeration
- Process Fuel
- Process Heating or Cooling Demand-Side Management (DSM) Program
- Process Heating or Cooling Waste Heat Recovery
- Processed Gas
- Processing
- Processing Gain
- Processing Loss
- Processing of Uranium
- Processing Plant
- Producer
- Producer and Distributor Coal Stocks
- Producer Contracted Reserves
- Producer Price Index (PPI)
- Producing Property
- Product Supplied
- Production
- Production Capacity
- Production Costs
- Production Expenses
- Production of Natural Gas Liquids (NGLs)
- Production Payments
- Production Plant Liquids (PPLs)
- Production, Crude Oil
- Production, Lease Condensate
- Production, Natural Gas
- Production, Natural Gas, Dry
- Production, Natural Gas, Wet After Lease Separation
- Production, Oil and Gas
- Production, Wet After Lease Separation
- Productive Capacity
- Profit
- Program Cost
- Propane (C3H8)
- Propane Air
- Propane, Consumer Grade
- Proportional Interest in Investee Reserves
- Proposed Rates
- Propylene (C3H6)
- Prospecting
- Prospecting Costs
- Proved (Measured) Reserves, Coal
- Proved Energy Reserves
- Proved Undeveloped Reserves (PUD)
- Public Authorities
- Public Authority Service to Public Authorities
- Public Street and Highway Lighting
- Public Utility
- Public Utility District (PUD)
- Public Utility Holding Company Act (PUHCA)
- Public Utility Holding Company Act of 1935 (PUHCA)
- Public Utility Regulatory Policies Act (PURPA)
- Public Utility Regulatory Policies Act of 1978 (PURPA)
- Public Utility Regulatory Policies Act of 1978 (PURPA)
- Publicly Owned Electric Utility
- Pulp Chips
- Pulp Wood
- Pulping Liquor (Black Liquor)
- Pumped-storage Hydroelectric Plant
- Purchase-Contract Imports of Uranium
- Purchased Electricity
- Purchased Energy
- Purchased Gas Adjustment (PGA)
- Purchased Power
- Purchased Power Adjustment
- Pure Pumped-Storage Hydroelectric Plant
- Pyrolysis