The ratio of fuel energy input as heat per unit of net work output; a measure of a power plant thermal efficiency, generally expressed as Btu per net kilowatt-hour.

A corporation, person, agency, authority or other legal entity that owns and/or operates facilities for the generation, transmission, distribution or sale of electricity primarily for use by the public.

The area of glass that fits in the window frame.

A coil of tungsten wire suspended in a vacuum or inert gas-filled bulb. When heated by electricity the tungsten "filament" glows.

The rate of heat flow required to maintain a specific indoor temperature; usually measured in Btu per hour.

A type of heating appliance similar to a fireplace, but much more efficient and clean burning. They are made of masonry and have long channels through which combustion gases give up their heat to the heavy mass of the stove, which releases the heat slowly ...

One thousand kilowatt-hours or 1 million watt-hours.

Energy produced by the conversion of biomass directly to heat or to a liquid or gas that can be converted to energy.

Energy output from a system that equals energy input.

This is a national organization dedicated to representing the interests of cooperative electric utilities and the consumers they serve. Members come from the 46 states that have an electric distribution cooperative.

A measure of the average amount of a specified pollutant or material emitted for a specific type of fuel or process.

Power generated by a utility unit that operates at a very low capacity factor; generally used to meet short-lived and variable high demand periods.

Equal to gross generation less electricity consumption of a power plant.

These lights use an electrically heated filament to produce light in a vacuum or inert gas-filled bulb.

An electricity generating facility that uses geothermal energy.

In a given electrical circuit, the amount of current in amperes (i) is equal to the pressure in volts (V) divided by the resistance, in ohms (R).

The ratio of the percentage change in the quantity of a good or service demanded to the percentage change in the price.

A lamp where the light beam is focused 2 inches ahead of the lamp reducing the amount of light trapped in the fixture.

Material such as brick, rock, or stone.

A solar water or space-heating system in which solar energy is collected, and/or moved by natural convection without using pumps or fans. Passive systems are typically integral collector/storage (ICS; or batch collectors) or thermosyphon systems. The majo ...