Facility
An existing or planned location or site at which prime movers, electric generators, and/or equipment for converting mechanical, chemical, and/or nuclear energy into electric energy are situated, or will be situated. A facility may contain more than one generator of either the same or different prime mover type. For a cogenerator, the facility includes the industrial or commercial process. 

Firm Power
Power or power-producing capacity intended to be available at all times during the period covered by a guaranteed commitment to deliver, even under adverse conditions.

Fly Ash
Particule matter from coal ash in which the particle diameter is less than 1 x 10-4 meter. This is removed from the flue gas using flue gas particulate collectors such as fabric filters and electrostatic precipitators. 

Forced Outage
The shutdown of a generating unit, transmission line or other facility, for emergency reasons or a condition in which the generating equipment is unavailable for load due to unanticipated breakdown. 

Fossil Fuel
Any naturally occurring organic fuel, such as petroleum, coal, and natural gas. 

Fossil-Fuel Plant
A plant using coal, petroleum, or gas as its source of energy.

Fuel
Any substance that can be burned to produce heat; also, materials that can be fissioned in a chain reaction to produce heat. 

Fuel Expenses
These costs include the fuel used in the production of steam or driving another prime mover for the generation of electricity. Other associated expenses include unloading the shipped fuel and all handling of the fuel up to the point where it enters the first bunker, hopper, bucket, tank, or holder in the boiler-house structure. 

Full-Forced Outage
The net capability of main generating units that is unavailable for load for emergency reasons.