A type of high intensity discharge light that has the most lumens per watt of any light source.

The type of alternative current generated by alternating current generators, rotary inverters, and solid-state inverters.

A type of insulation that is molded or expanded to produce coarse, closed cells containing air. The rigid cellular structure provides thermal and acoustical insulation, strength with low weight, and coverage with few heat loss paths. Often used to insulat ...

A plan developed by an electric utility, sometimes as required by a public regulatory commission or agency, that defines the short and long term capacity additions (supply side) and demand side management programs that it will undertake to meet projected ...

Any fuel that is in solid form, such as wood, peat, lignite, coal, and manufactured fuels such as pulverized coal, coke, charcoal, briquettes, pellets, etc.

The amount of heat required to raise a unit mass of a substance through one degree, expressed as a ratio of the amount of heat required to raise an equal mass of water through the same range.

The damping of interior temperature fluctuations by massive construction.

The difference between the brightness of an object compared to that of its immediate background.

A heat exchanger in which two fluids flow in opposite directions for transfer heat energy from one to the other.

Materials with high thermal energy storage capacity contained in or part of a building's walls, floors, or freestanding elements.

A solar photovoltaic device with a specified area.

A type of furnace in which fuel is burned and the heat is used to produce steam.

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 amount of power density in sunlight received at the earth's surface at noon on a clear day (about 1,000 Watts/square meter).

This committee has legislative jurisdiction and general and special oversight and investigative authority on all matters relating to energy and environmental research and development and demonstration.

A widely used rate of return for performing economic analysis. This method solves for the interest rate that equates the equivalent worth of an alternative's cash receipts or savings to the equivalent worth of cash expenditures, including investments. The ...

One layer of glass in a window frame. It has very little insulating value (R-1) and provides only a thin barrier to the outside and can account for considerable heat loss and gain.

A power plant that uses two thermodynamic cycles to achieve higher overall system efficiency; e.g.: the heat from a gas-fired combustion turbine is used to generate steam for heating or to operate a steam turbine to generate additional electricity.

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

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