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The current power industry efficiency focuses usually on the whole industry or the efficiency changes in different periods, and little care about the power enterprise efficiency fluctuation in a single period is taken. Also at present there is little attention paid to the efficiency difference between four types of power enterprise. In the present paper, an improvement of DEA CCR model was carried out to calculate the power enterprise efficiency fluctuation in a single period. This would provide a platform for the improvement of the power enterprise efficiency.

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