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merit order
The merit order is a way of ranking available sources of energy, especially electrical generation, based on ascending order of price (which may reflect the order of their short-run marginal costs of production) together with amount of energy that will be generated. In a centralized management, the ranking is so that those with the lowest marginal costs are the first ones to be brought online to meet demand, and the plants with the highest marginal costs are the last to be brought on line. Dispatching generation in this way minimizes the cost of production of electricity. Sometimes generating units must be started out of merit order, due to transmission congestion, system reliability or other reasons.
== The merit order in the British electricity market ==
The merit order was the method used in the electricity market of Great Britain when electrical power generation was the responsibility of a single integrated utility (the CEGB). After privatisation of the sector this was replaced by a more complex bidding system, the electricity pool, in 1990.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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