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 ...

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.)

The air that is supplied to the combustion chamber of a furnace.

A window located on the roof of a structure to provide interior building spaces with natural daylight, warmth, and ventilation.

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 power required to energize the magnetic field of a generator.

The apparent angle of the sun north or south of the eath's equatorial plane. The earth's rotation on its axis causes a daily change in the declination.

see Peak Watt.

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

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.

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

The monochromatic irradiance of a surface per unit bandwidth at a particular wavelength, usually expressed in Watts per square meter-nanometer bandwidth.

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

A deposition process whereby heat is used to break molecules into elemental sources that are then spray deposited on a substrate.

Restrictions on the use of a property.

A generator with a single armature coil, which may have many turns and the alternating current output consists of a succession of cycles.

A water and energy conserving device that limits the amount of water that a faucet or showerhead can deliver.

The region between an n-layer and a p-layer in a single material, photovoltaic cell.

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

A tax credit granted for specific types of investments.