Glossary of Terms

Day-Ahead Market

The forward market for energy and ancillary services to be supplied during the settlement period of a particular trading day that is conducted by the Independent System Operator, the power exchange, and other Scheduling Coordinators. This market closes with the Independent System Operator's acceptance of the final day-ahead schedule.

Day-Ahead Schedule

A schedule prepared by a Scheduling Coordinator or the Independent System Operator before the beginning of a trading day. This schedule indicates the levels of generation and demand scheduled for each settlement period that trading day.

Demand

The rate at which energy is delivered to loads and scheduling points by generation, transmission, and distribution facilities.

Demand (Electric)

The rate at which electric energy is delivered to or by a system, part of a system, or piece of equipment, at a given instant or averaged over any designated period of time.

Demand Bid

A bid into the power exchange indicating a quantity of energy or an ancillary service that an eligible customer is willing to purchase and, if relevant, the maximum price that the customer is willing to pay.

Demand-Side Management

The planning, implementation, and monitoring of utility activities designed to encourage consumers to modify patterns of electricity usage, including the timing and level of electricity demand. It refers only to energy and load-shape modifying activities that are undertaken in response to utility-administered programs. It does not refer to energy and load-shape changes arising from the normal operation of the marketplace or from government-mandated energy-efficiency standards. Demand-Side Management (DSM) covers the complete range of load-shape objectives, including strategic conservation and load management, as well as strategic load growth.

Deregulation

The elimination of regulation from a previously regulated industry or sector of an industry.

Direct Access

The ability of a retail customer to purchase commodity electricity directly from the wholesale market rather than through a local distribution utility.

Distribution

The delivery of electricity to retail customers (including homes, businesses, etc.).

Distribution System

The portion of an electric system that is dedicated to delivering electric energy to an end user.

A thru C   D   E   F   G   H thru K   L thru M   N thru O   P   Q thru R   S   T   U thru W   All Glossary Terms