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.

Energy output from a system that equals energy input.

A heating system that uses only outside air for combustion and vents combustion gases directly to the outdoors. These systems are less likely to backdraft and to negatively affect indoor air quality.

An electricity generating facility that uses geothermal energy.

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

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 ...

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.

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

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

The minimum temperature at which combustion of a solid or fluid can occur.

A device or media that absorbs heat for storage for later use.

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

The area of glass that fits in the window frame.

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.

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).

Material such as brick, rock, or stone.

The generation of an electric current, when two conductors of different metals are joined at their ends to form a circuit, with the two junctions kept at different temperatures.

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

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

The change in direction of a ray of light when it passes through one media to another with differing optical densities.