A measure of the unavailable or unusable energy in a system; energy that cannot be converted to another form.

Energy that is capable or available for doing work; the time rate at which work is performed, measured in horsepower, Watts, or Btu per hour. Electric power is the product of electric current and electromotive force.

Wind turbines that operate at a constant rotor revolutions per minute (RPM) and are optimized for energy capture at a given rotor diameter at a particular speed in the wind power curve.

The conversion of electric power to visible light by using an electric charge to excite gaseous atoms in a glass tube. These atoms emit ultraviolet radiation that is absorbed by a phosphor coating on the walls of the lamp tube. The phosphor coating produc ...

Pounds/force per square inch absolute.

A solar heating system that uses a liquid as the heat transfer fluid.

The fossil fuels: coal, oil, and natural gas.

A fuel gas with a heating value between 90 and 200 Btu per cubic foot.

A type of anaerobic digester that has a horizontal tank in which a constant volume of material is added and forces material in the tank to move through the tank and be digested.

A solid that contains pores; normally, it refers to interconnected pores that can transmit the flow of fluids. (The term refers to the aquifer geology when discussing sites for CAES.)

A commonly used analysis for reporting fuel properties; may be on a dry (moisture free) basis, as "fired", or on an ash and moisture free basis. Fractions usually reported include: volatile matter, fixed carbon, moisture, ash, and heating value (higher he ...

That portion of an electricity supply system used to deliver electricity from points on the transmission system to consumers.

The percentage of a building's seasonal energy requirements that can be met by a solar energy device(s) or system(s).

A plot of a wind energy conversion device's power output versus wind speed.

The interior area of a building, calculated in square feet or meters.

A coating applied to the surface of the glazing of a window to reduce heat transfer through the window.

A chemical element, of atomic number 14, that is semi-metallic, and an excellent semiconductor material used in solar photovoltaic devices; commonly found in sand.

see Solar Spectrum above.

The quantity of heat that a cooling appliance is capable of removing from a room in one hour.

An interior or exterior movable panel that operates on hinges or slides into place, used to protect windows or provide privacy.