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- Aggregators: Brokers who seek to bring together customers to create a "load" so that they can buy power in bulk, taking advantage of economies of scale.
- Ampere (amp): Unit that measures electrical current in a circuit.
- Base-Load Capacity: Generating units, such as coal-fired steam and combined cycle plants, that are used around the clock to meet consumer's electric needs.
- Capacity: The maximum load a generating unit, generating station, or other electrical apparatus is rated to carry or can actually carry under existing service conditions.
- Circuit: Conductor for electric current.
- Combustion Turbine Plants: Small electric generating units, usually gas and/or oil-fired, that are typically used for peaking capacity.
- Combined Cycle Plants: Electric generating units in which electricity is produced from otherwise lost waste heat, in the form of steam, exiting from one or more combustion turbines.
- Coal-Fired Steam Units: Generating plants that use the steam produced by heating water with burning coal to create electricity.
- Current: Current is the flow of electrons in an electric conductor.
- Demand: The rate at which electric energy is delivered to or by a system, part of a system, or a piece of equipment. The primary source of demand is the power-consuming equipment of the customers.
- Deregulation (also called Restructuring, Customer Choice, Retail Wheeling, etc.): The ability of generation companies or brokers to sell electricity directly to retail consumers, utilizing regulated transmission lines and the regulated distribution facilities of existing utility companies.
- Distribution: The function of delivering power to retail customers after it reaches the city gates by way of the transmission grid.
- Energy: This is broadly defined as the capability of doing work. In the electric power industry, energy is more narrowly defined as electric energy supplied over time, expressed in kilowatt-hours (kWh) or megawatt-hours (MWh).
- Generation or Production: The actual creation of electricity at power plants or generating stations.
- Generation Costs: Costs to produce electricity or acquire it by contract.
- Grid: The system of transmission lines, regionally and locally, linking generating facilities to distribution systems.
- Independent System Operator or Regional Transmission Operator: Regional, independent managers of transmission facilities formed to ensure safe, reliable and fair transfer of electricity from generators to distribution companies at a consistent price.
- Investor-Owned Utility (IOU): A utility that is owned by shareholders who receive a dividend based on profits from electric sales.
- Joint Action Agency: A not-for-profit organization of municipal utilities that band together to jointly own and operate generation and transmission facilities to gain economies of scale.
- kWh: Kilowatt-hour - how consumption of electricity is measured.
- Load: Amount of electricity needed at a given time.
- Market Power: When one or a few large companies dominate power production in a regional market and use such dominance to manipulate the market.
- Megawatt (MW): One million watts
- Megawatt-hour (MWh): One thousand kilowatt-hours or one million watt-hours.
- Municipal Utility: A utility that is owned and operated by a municipality, a Public Power utility.
- North American Electric Reliability Council (NERC): NERC is a voluntary membership organization that makes reliability rules and standards fro the electric utility industry.
- Obligation to Serve: Obligation by a utility to assure adequate supply of electricity for all customers into the future.
- "Pancaked" Transmission Rates: The practice of adding a transmission fee on top of previous transmission fees each time power passes through a different utility service area between the generator and the distribution system.
- Peak Demand: The point at which demand for electricity reaches its highest level.
- Peaking Capacity: Generating units, like combustion turbine plants, that are used when the demand for electricity is high.
- Power Exchange: A spot market for electricity in competitive marketplaces.
- Public Power: The term used for not-for-profit utilities that are owned and operated by a municipality, state or the federal government.
- Regulated Monopoly: Utility with service territory protection. The system currently in place in the regulated electric utility industry in which one utility is designated to serve a defined service territory.
- Regulation: Supervision over rates, terms and conditions of service, financing and service areas by a governmental agency.
- Reliability: Steady, predictable and consistent electric service and prices.
- Restructuring: Reconfiguring the market structure by eliminating the monopoly on some of the necessary functions of an electric company.
- Retail Customer: A residential, commercial, industrial or other ultimate user of electricity.
- Rural Electric Membership Cooperative (REMC): A member-owned utility funded through government or CFC loans or private funding to serve a rural area.
- Service Territory: A designated area served by an individual utility under a regulated utility structure.
- Stranded Investments: Generation, transmission or distribution facilities whose costs cannot be recovered because the power or service cannot be sold on the open market at a price that allows for recovery of the investment in the facilities.
- Substation: A facility used for switching and/or changing or regulating the voltage of electric energy. Substation may tie generating stations to transmission systems or transmission systems to distribution systems.
- Transformer: A device for changing the voltage of alternating current. Step-up transformers increase voltage, for example, from a power plant to a transmission system. Step-down transformers reduce voltage, for example, from a transmission system to a distribution system or from a distribution line to a retail customer's premises.
- Transmission: The system of lines that carries electricity from generators to distribution companies.
- Vertically-Integrated Utility: A utility that provides all generation, transmission and distribution services to its customers.
- Voltage: A measure of the force which makes electrons move or provides potential for them to move.
- Watt: The electric unit of power or rate of doing work. One horsepower is equivalent to approximately 750 watts.
- Watt-hour: One watt of power expended for one hour.
- Wholesale Customer: An entity that purchases power for resale to others.
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