The volume of a unit weight of a substance at a specific temperature and pressure.

The flow of electrical energy (electricity) in a conductor, measured in amperes.

The ratio of power produced by a wind energy conversion device to the power in a reference area of the free windstream.

The process of modifying a building's structure.

A popular term for highly insulating window with a heat loss so low it performs better than an insulated wall in winter, since the sunlight that it admits is greater than its heat loss over a 24 hour period.

A solar energy collection device consisting of containers of water located on a roof that absorb solar energy during the day so that the heat can be used at night or that cools a building by evaporation at night.

The physical material upon which a photovoltaic cell is applied.

Glass, plastic panels, or plastic sheets that reduce air infiltration and some heat loss when attached to either the interior or exterior of existing windows.

A type of High-Intensity Discharge (HID) lamp that uses sodium under high pressure as the primary light-producing element. These high efficiency lights produce a golden white color and are used for interior industrial applications, such as in warehouses a ...

A unit of mass equal to 1,000 kilograms or 2,204.6 pounds.

ICS solar systems are also called "batch" or "breadbox" water heaters. They combine the collector and storage tank in one unit. The sun shining into the collector strikes the storage tank directly, heating the water. The large thermal mass of the water, p ...

A solar energy system that produces electricity with a PV module, and collects thermal energy from the module for heating. There are no commercially available systems available (as of 11/97).

The storage of compressed air in a container for use to operate a prime mover for electricity generation.

Transmit high-voltage electricity from the transformer to the electric distribution system.

A heat source, such as a space heater, used to provide more heat than that provided by a primary heating source.

A common utility monetary measure equal to one-thousandth of a dollar or a tenth of a cent.

A system where heat is supplied to areas of a building from a single appliance through a network of ducts or pipes.

Methyl Tertiary Butyl Ether (MTBE) is an ether compound used as a gasoline blending component to raise the oxygen content of gasoline. MTBE is made by combining isobutylene (from various refining and chemical processes) and methanol (usually made from nat ...

The gaseous byproducts of the combustion of a fuel.

As defined by the Comprehensive National Energy Act of 1992 (or the Energy Policy Act; EPAct): any organic matter from a plant which is planted for the exclusive purpose of being used to produce energy." This does not include wood or agricultural wastes o ...