This term does not refer to the amount of energy available when supply is at peak. Instead it refers to the party who supplies energy used to meet peak demand requirements. In other words, a peak supply is a supply of energy which will be used to augment existing energy sources during periods of peak demand. As examples, the noontime output of a hydroelectric generator is not considered to be a peak supply. The peak supply is instead the generating unit which produces output for noontime use.

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