Stationary gas turbine - any simple cycle gas turbine, regenerative cycle gas turbine or any gas turbine portion of a combined cycle steam/electric generating system that is not self-propelled. It may be mounted on a vehicle for portability.

Simple cycle gas turbine - any stationary gas turbine which does not recover heat from the gas turbine exhaust gases to preheat the inlet combustion air to the gas turbine, or which does not recover heat from the gas turbine exhaust gases to heat water or generate steam.

Regenerative cycle gas turbine - any stationary gas turbine which recovers heat from the gas turbine exhaust gases to preheat the inlet combustion air to the gas turbine.

Combined cycle gas turbine - any stationary gas turbine which recovers heat from the gas turbine exhaust gases to heat water or generate steam.

Emergency gas turbine - any stationary gas turbine which operates as a mechanical or electrical power source only when the primary power source has been rendered inoperable by an emergency.

Ice fog - an atmospheric suspension of highly reflective ice crystals.

ISO (International Standards Organization) standard day conditions - 2880 K temperature, 60% relative humidity, and 101.3 kilopascals pressure.

Efficiency - gas turbine manufacturer’s rated heat rate at peak load, in terms of heat input per unit of power output, based on the lower heating value of the fuel.

Peak load - 100% of the manufacturer’s design capacity of a gas turbine at ISO standard day conditions.

Base load - the load at which a gas turbine is normally operated.

Electric utility stationary gas turbine - any stationary gas turbine constructed for the purpose of supplying more than one-third of its potential electric output capacity to any utility power distribution system.

Emergency fuel - a fuel fired by a gas turbine only during a breakdown or other occurrence.