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

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 ...

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 process of producing electricity by transforming other forms or sources of energy into electrical energy; measured in kilowatt-hours.

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

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

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 ...

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.

A device that produces mechanical energy directly from two heat reservoirs of different temperatures. A machine that converts thermal energy to mechanical energy, such as a steam engine or turbine.

A measure of the effective cooling capacity of a refrigerator, expressed in Btu per hour or in tons, where one (1) ton of capacity is equal to the heat required to melt 2,000 pounds of ice in 24 hours or 12,000 Btu per hour.

The process of using heat that is rejected in one part of a cycle for another function or in another part of the cycle.

The ability to send or wheel electric power to a customer over a transmission and distribution system that is not owned by the generator (seller) of the power.

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

The amount of time required for positive cash flows to equal the total investment costs.

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.

Material such as brick, rock, or stone.

An electric current induced by radiant energy.

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

The addition of dopants to a semiconductor.

The maximum value of natural solar insolation.