Heat Rate : A measure of generating station thermal efficiency and generally expressed as Btu per net k/Wh. The heat rate is computed by dividing the total Btu content of the fuel burned (or of heat released from a nuclear reactor) by the resulting net kWh generated.
High Heat Value (HHV) : The high or gross heat content of the fuel with the heat of vaporization included; the water vapor is assumed to be in a liquid state.
Hourly Metering : Tracking or recording a customer's consumption during specific periods of time that can be tied to the price of energy.
Hourly Non-Firm Transmission Service : Transmission scheduled and paid for on an as-available basis and subject to interruption.
Hydroelectric : An electric generating station in which a water wheel is driven by falling water, thus generating electricity.