R
- R-value
- Rack Sales
- Radiant Barrier
- Radiant Ceiling Panels
- Radiant Energy
- Radiation
- Radiative Forcing
- Radiatively Active Gases
- Radiator
- Radioactive Waste
- Radioactivity
- Radioisotope
- Radon
- Rail Transport
- Railroad and Railway Electric Service
- Railroad Locomotive
- Railroad Use
- Range Top
- Rankine Cycle
- Rankine Cycle Engine
- Rate Base
- Rate Base (Electric)
- Rate Case
- Rate Features
- Rate of Return (ROR)
- Rate of Return on Rate Base (RRRB)
- Rate Schedule (Electric)
- Ratemaking Authority
- Rates
- Rating
- Ratio Estimate
- Ratoon Crop
- Raw Coal
- Rayleigh Frequency Distribution
- Reactance
- Reactive Power
- Real Dollars
- Real Power
- Real Price
- Reasonably Assured Reserves (RAR)
- Reasonably Assured Resources (RAR)
- Rebate Program
- Reburn
- Receipts
- Receivables from Municipality
- Received
- Reclamation
- Reclamation Expenses
- Recoverability
- Recoverable Authorized Capacity (RAC)
- Recoverable Coal
- Recoverable Proved Reserves
- Recoverable Resources of Coal
- Recovery Factor (Coal)
- Recovery Factor (Oil and Natural Gas)
- Recovery Percentage (Coal)
- Rectifier
- Recycled Feeds
- Recycling
- Redox Potential
- Redrill Footage
- Reduced Use-Off Hours
- Reference Month
- Reference Year
- Refined Coal
- Refined Petroleum Products
- Refiner
- Refiner Acquisition Cost of Crude Oil
- Refinery
- Refinery and Blender Net Inputs
- Refinery and Blender Net Production
- Refinery Capacity Utilization
- Refinery Fuel
- Refinery Gas
- Refinery Input, Crude Oil
- Refinery Input, Total
- Refinery Losses and Gains
- Refinery Olefins
- Refinery Output
- Refinery Production
- Refinery Utilization Rate
- Refinery Yield
- Refinery-Grade Butane
- Reflective Film
- Reflectivity
- Reforestation
- Reformulated Blendstock for Oxygenate Blending (RBOB)
- Reformulated Blendstock for Oxygenate Blending (RBOB)
- Reformulated Gasoline (RFG)
- Reformulated Gasoline (RFG)
- Refrigeration Unit
- Refunding
- Refuse Bank
- Refuse Mine
- Refuse Recovery
- Refuse-derived Fuel (RDF)
- Refuse-Derived Fuel (RDF)
- Regional Reserves, Regional Reserve Estimates (Coal)
- Regional Transmission Group (RTG)
- Regular Gasoline
- Regulated Entity
- Regulated Streamflow
- Regulation
- Regulation, Procedures, and Practices
- Reheating Coils
- Reid Vapor Pressure (RVP)
- Reid Vapor Pressure (RVP)
- Reinjected
- Reinserted Fuel
- Reinsertion
- Relative Standard Error (RSE)
- Reliability (Electric System)
- Reliability Coordinator (Electric)
- Relocation of Tailings
- Remaining Coal Reserves
- Renewable Diesel Fuel
- Renewable Energy Certificates (RECs)
- Renewable Energy Resources
- Renewable Fuel Standard (RFS)
- Renewable Gasoline
- Renewable Heating Oil (RHO)
- Renewable Jet Fuel (RJF)
- Renewable Naphtha
- Replacement Energy Source for Primary Heating
- Replacement Vehicle
- Report State
- Report Week
- Report Year (Calendar)
- Report Year (Fiscal)
- Reporting
- Repowering
- Repressuring
- Reprocessing
- Requirements Power
- Reregulation
- Resale (Wholesale) Sales
- Research and Development (R&D)
- Reseller
- Reserve
- Reserve Additions
- Reserve Cost Categories of $15, $30, $50, and $100 per Pound U3O8
- Reserve Generating Capacity
- Reserve Margin (Operating)
- Reserve Revisions
- Reserves Changes
- Reserves, Coal
- Reserves, Energy
- Reserves, Net
- Reservoir (Hydrocarbon Reservoir)
- Reservoir Capacity
- Reservoir Repressuring
- Residential Building
- Residential Consumers
- Residential Energy Consumption Survey (RECS)
- Residential Heating Oil Price
- Residential Propane Price
- Residential Sector
- Residential Type Central Air Conditioner
- Residential Vehicles
- Residential/Commercial (Consumer Category)
- Residual Fuel Oil (RFO)
- Residue Gas
- Residuum
- Respondent
- Restoration Time
- Restricted-Universe Census
- Restructuring
- Retail Motor Gasoline Prices
- Retail Sales (Electric)
- Retail Wheeling
- Retailer
- Retained Earnings
- Retire from Service
- Retired Hydropower Plant Sites
- Return on Common Equity (ROCE)
- Return on Common Stock Equity (ROE)
- Revenue (Electricity)
- Revenue Requirement
- Reversible Turbine
- Revisions and Additions (Gross Change in Reserves)
- Ribbon Silicon
- Right-of-Way
- Right-of-Way (Electric)
- Rip Rap
- River Transport in Energy
- Road Oil
- Rodlet or GAD Basket
- Roll Front
- Roof (Coal)
- Roof Insulation
- Roof or Ceiling Insulation
- Roof Pond (Passive Solar Heating System)
- Room Air Conditioner
- Room Heater Burning Gas, Oil, and Kerosene
- Room-and-Pillar Mining
- Rotary Rig
- Round Test Mesh
- Roundwood
- Royalties (Coal)
- Royalty
- Royalty Cost
- Royalty Interest
- Royalty Interest (Including Overriding Royalty)
- Rulemaking (Regulations)
- Run-of-mine Coal
- Run-of-River Hydroelectric Plant
- Running and Quick-Start Capability
- Runoff
- Rural Electrification Administration (REA)
- Rural Electrification Administration (REA)