The process of storing, or converting energy from one form to another, for later use; storage devices and systems include batteries, conventional and pumped storage hydroelectric, flywheels, compressed gas, and thermal mass.

The process of controlling indoor moisture levels and condensation.

The two times of the year when the sun is apparently farthest north and south of the earth's equator; usually occurring on or around June 21 (summer solstice in northern hemisphere, winter solstice for southern hemisphere) and December 21 (winter solstice ...

A measure of the quality of a light source by expressing the color appearance correlated with a black body.

Restrictions on the use of a property.

Salt mixtures with potential applications as solar thermal energy storage materials.

The lower or net heat of combustion for a fuel that assumes that all products of combustion are in a gaseous state. (See Net Heating Value below.)

The net south-facing glazing area projected on a vertical plane. Also, the solid area covered at any instant by a wind turbine's blades from the perspective of the direction of the windstream (as opposed to the swept area).

The ratio of the sum of the noncoincidental maximum demands of two or more loads to their coincidental maximum demands for the same period.

A tax credit granted for specific types of investments.

A source of power (electricity) that can displace power from another source so that source's power can be transmitted to more distant loads.

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 ...

The space between a hanging ceiling and the floor above or roof; usually contains HVAC ducts, electrical wiring, fire suppression system piping, etc.

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

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 process by which sunlight directly enters a building through the windows and is absorbed and stored in massive floors or walls.

Pounds of pressure per square inch.

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

see Solar Spectrum above.

see Peak Watt.