Solar collector thermal performance ratings based on collector efficiencies, usually expressed in Btu per hour for solar collectors under standard test or operating conditions for solar radiation intensity, inlet working fluid temperatures, and ambient te ...

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.

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

A valve used to mix heated water with cold in a heating system to provide a desired water temperature for end use.

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

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

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.

The area of glass that fits in the window frame.

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.

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.

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

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).

An electricity generating facility that uses geothermal energy.

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

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

Material such as brick, rock, or stone.

A device used to measure total incident solar radiation (direct beam, diffuse, and reflected radiation) per unit time per unit area.

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