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This statistic shows average power plant operating expenses for major investor-owned electric utilities in the United States between 1998 and 2011. In 2005, the operating expenses for nuclear power plants run by major U.S. investor-owned electric totaled 18.15 mills per kilowatt hour. According to the source, a mill is a monetary cost and billing unit equal to 1/1000 of the U.S. dollar (equivalent to 1/10 of one cent).