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Interruptible Rate

The lower rate offered to a customer (generally a large industrial or commercial entity) who agrees to have electric service interrupted, usually during a high demand period

Investor-Owned Utility

a for-profit electric utility owned by stockholders that is regulated by the state and federal governments

IPP

An independent power producer that generates electricity but lacks transmission and distribution

IRP

Integrated resource planning by electric utilities that uses a least-cost combination of demand-side management, conservation and new resources to meet projected future demands

Island

A component of a transmission system (or several systems) that becomes separated from its interconnection because of the disconnection or failure of elements within the system

ISO

The independent system operator that manages a region's transmission grid

Kilowatt-hour (kWh)

A unit of energy or power multiplied by time (3 hours of watching television = 1 kWh)

LDC

Local distribution company

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)

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