Haw. Code R. § 6-74-3
As used in this chapter, unless the context clearly requires otherwise:
"Biomass" means any organic material not derived from fossil fuels.
"Bottoming-cycle cogeneration facility" means a cogeneration facility in which the energy input to the system is first applied to a useful thermal energy process, and the reject heat emerging from the process is then used for production of electric energy.
"Cogeneration facility" means equipment used to produce electric energy and forms of useful thermal energy (heat or steam), used for industrial, commercial, heating, or cooling purposes, through the sequential use of energy.
"Electric utility holding company" means a holding company defined in §2(a)(7) of the Public Utility Holding Company Act of 1935, 15 U.S.C. 79b(a)(7), which owns one or more electric utility companies, as defined in §2(a)(3) of that Act, 15 U.S.C. §79b(a)(3), but does not include any holding company which is exempt by rule or order adopted or issued pursuant to §§3(a)(3) or 3(a)(5) of the Public Utility Holding Company Act of 1935, 15 U.S.C. §79c(a)(3) or § 79c(a)(5).
"Natural gas" means either natural gas unmixed, or any mixture of natural gas and artificial gas not derived from oil.
"Oil" means crude oil, residual fuel oil, natural gas liquids, or refined petroleum products, including any gas derived therefrom.
"Supplementary firing" means an energy input to the cogeneration facility used only in the facility, or only in the electric energy generating process of a bottoming-cycle cogeneration facility.
"Topping-cycle cogeneration facility" means a cogeneration facility in which the energy input to the facility is first used to produce useful power output to produce electricity, and the reject heat from power production is then used to provide useful thermal energy.
"Total energy input" means the total energy of all forms supplied from external sources.
"Total energy output" of a topping-cycle cogeneration facility is the sum of the useful power output and useful thermal energy output.
"Useful power output" of a cogeneration facility means the electric or mechanical energy made available for use, exclusive of any energy used in the power production process.
"Useful thermal energy output" of a topping cycle cogeneration facility means the thermal energy made available for use in any industrial or commercial process, or used in any heating or cooling application.
"Waste" means by-product materials other than biomass.
Haw. Code R. § 6-74-3