The total generating units' capacities in a power plant or on a total utility system. The capacity can be based on the nameplate rating or the declared net (dependable) capacity (DNC).

Losses that result from the heating effect of current as it flows through wires to travel from the generation facility to the customer. Because of losses, the electricity produced by the utility is greater than the electricity that shows up on the customer bills.

Flow of electricity that constantly changes direction between positive and negative sides. Electricity produced in the UK moves in current that shifts direction at a rate of 50 times per second (50 Hertz, 50Hz).

The minimum load experienced by an electric utility system over a given period of time. Baseload capacity - Generating equipment operated to serve loads 24-hours per day (eg. nuclear power plants).

the British Electricity Transmission and Trading Arrangements introduced in April 2005, extending NETA to Scotland.

The maximum load a generating unit, generating station, or other electrical apparatus is rated to carry.

The ratio of the electrical energy produced by a generating unit relative to the electrical energy that could have been produced at continuous full power operation during the same period of time. The Capacity Factor for wind energy in the UK is typically between 20% and 40%.

Sometimes referred to as capacity credit, this is an expression of the percentage of conventional generation that can be displaced by wind generation. The capacity value may be equal to the capacity factor at low levels of wind penetration, but will be lower as penetration increases.

Combined cycle gas turbine; modern gas powered electricity generating technology.

A foregoing or reduction of electric usage for the purpose of saving natural energy resources and limiting peak demand in order to ultimately reduce the capacity requirements for plant and equipment.