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Peak demand/load
The maximum energy demand or load in a specified time period.

Peak hour demand
Time when the largest demand for hot water is needed.

Peak load
Time that the highest electrical load is in use.

Peak load period
The period of the day in which the system has the greatest demand.

Peak power
Power generated by a utility unit that operates at a very low capacity factor; generally used to meet short-lived and variable high demand periods.

Peak shifting
The process of moving existing loads to off-peak periods.

Peak watt
A unit used to rate the performance of a solar photovoltaic (PV) cells, modules, or arrays; the maximum nominal output of a PV device, in Watts (Wp) under standardized test conditions, usually 1000 Watts per square meter of sunlight with other conditions, such as temperature specified.

Peak wind speed
The maximum instantaneous wind speed (or velocity) that occurs within a specific period of time or interval.

Peaking capacity
Power generation equipment or system capacity to meet peak power demands.

Peaking hydropower
A hydropower plant that is operated at maximum allowable capacity for part of the day and is either shut down for the remainder of the time or operated at minimal capacity level.

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