Glossary

EPA (Energy Policy Act of 1992)

The legislation passed by the US Congress requiring electric utilities to provide access to their transmission and increasing wholesale competition in order to reduce the price of electricity for all customers

EWG (Exempt Wholesale Generator)

Under the Energy Policy Act of 1992, a wholesale generator that is exempted from certain financial and legal restrictions specified in the Public Utility Holding Company Act of 1935

Exit Fee

The price paid by a customer who switches to another electricity supplier

Externalities

Costs that are not factored into ("internalized") electricity generation, such as the environmental costs of additional pollution

FERC Order 888

The comprehensive rules enacted in 1996 that require open, nondiscriminatory access to transmission lines for wholesale electricity suppliers

Flow-Based Pricing

Pricing transmission based on the cost of each parallel path upon which the electric power flows

Flowgate

A link in a transmission system

Genco

An electric generation company

Generation

Conversion of nuclear, thermal, etc. energy into electricity

Grid

The interconnected power lines and generators that supply, transmit and distribute electric power to the customers connected to it

Gridco

An independent company that operates an electric grid

Hedging Contract

A financial instrument that establishes the future prices and quantities of electricity independently of the short-term market, e.g., contracts for differences, forwards, futures, and option contracts

Hourly Market

The market in which blocs of energy are traded on an hourly basis

Hub

A transmission network location where the price of electricity is used by traders as a reference price for spot transactions and for contracting

Incremental Load

The portion of a generator's load that is in addition to its existing load

Interchange

Electric power or energy that flows from one entity to another

Interconnected System

A system consisting of two or more individual electric systems that operates synchroniously and have connecting tielines
  •  
  • 1 of 2
  • »

LDC

Local distribution company

LMP (Locational Marginal Pricing)

Pricing electricity to include the costs of transmission losses, congestion and the local costs of generation (also called location-based pricing)

Load

Any consumer of electrical energy; also, the amount of power (demand) used by a utility system, electrical device or consumer. Load can be manually or automatically curtailed or shed temporarily during times of high usage (customers have agreed beforehand to such actions) or managed to ensure a reliable electricity supply

Load Center

An area (city, etc.) that uses large amounts of electricity (also called a load pocket)

Load Following

Planning by utilities to ensure that electric generators operate as scheduled, based upon load forecasts (also, operating a generator to balance short-term load fluctuations)

Load Forecasting

Planning by utilities to ensure a reliable electricity supply

Load Response

Reducing electricity use from the grid during peak periods to increase reliability and moderate the energy-clearing price during system-wide peak demand; reducing electric load or using qualifying emergency generators on the customer side of the meter.

LSE (Load Serving Entity)

A transmission or distribution utility that has contractual or regulatory obligations to connect its load to the transmission grid

Margin

The difference between net capacity (a system's total capacity resources) and net internal demand, that is generally expressed in MW for operating reserves and as a percentage of either system load or installed generating capacity for planning reserves

Marginal Cost

The cost of providing additional electricity; "The competitive price of a MWh of electricity is equal to the additional amount it would cost to generate an additional MWh, once all current demand is met. This additional cost is commonly referred to as the marginal cost. The marginal cost of generating electricity rises as more electricity is produced, because different generators use different types and amounts of fuel_.under competition, the rising marginal cost of electricity leads to high prices when demand is high and low prices during low-demand periods." (GAO-02-828 Restructured... Read more about Marginal Cost

QF (Qualifying Facility)

Under PURPA, a non-utility generator of electric power that has received a certificate from FERC, enabling it to sell electricity only at wholesale avoided cost to a utility

Rate Base

Accumulated capital cost of a utility's purchased or installed facilities that serve customers

Real Option Theory

in economics, finding reduced economies of scale and applying them across all alternatives

Real Time Pricing

Pricing electricity based on the actual cost at the time it is demanded by a customer

Regional Transmission Organization (RTO)

A for-profit or non-profit entity that coordinates transmission planning, operations and use on a regional and inter-regional basis and that is subject to FERC approval

Regulatory Asset

An intangible (deferred debt cost, accelerated depreciation, etc.) that appears on a regulated utility's balance sheet and that can be recovered from ratepayers under regulation

Reliability

The measure of performance of a bulk-power system that results in electricity being delivered to consumers within accepted standards and in the amount desired; measured by frequency, duration and magnitude of adverse impacts on the electric supply (also called system reliability). Reliability comprises both generation adequacy and system security.

Retail Wheeling

Allowing a customer to buy electricity from a supplier of choice and transmit (wheel) it on the grid

Revenue Cap

An alternative regulation plan that caps a utility's allowed revenues with an external index

Schedule

An agreed-upon transaction size (measured in MW), start and end times, start and end ramp times and rates required for delivery and receipt of power and energy between contracting parties and the control areas involved in the transaction

VAR (Volt-Amperes Reactive)

The unit of measure of the power that maintains the constant variation of the electro-magnetic fields associated with alternating-current circuits

Voltage

The force that makes electricity flow; the unit of measure of electric potential

Volumetric Wires Charge

A fee for using the transmission or distribution system that is based on the volume of electricity that is transmitted

Wholesale Wheeling

Buying transmission services from a utility to transport (wheel) electricity to another utility, non-utility generator or a wholesale customer

Wires Charge

Charging electric suppliers or their customers for the use of transmission or distribution wires