Unit operating hour
Unit operating hour means a clock hour during which a unit combusts any fuel, either for part of the hour or for the entire hour.
40 CFR § 72.2
The terms used in this part, in parts 73, 74, 75, 76, 77 and 78 of this chapter shall have the meanings set forth in the Act, including sections 302 and 402 of the Act, and in this section as follows:
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