Sequential use of energy
Sequential use of energy means:
(1) For a topping-cycle cogeneration unit, the use of reject heat from electricity production in a useful thermal energy application or process; or
(2) For a bottoming-cycle cogeneration unit, the use of reject heat from useful thermal energy application or process in electricity production.
40 CFR § 96.302
The terms used in this subpart and subparts BBBB through IIII shall have the meanings set forth in this section as follows: