The gaseous byproducts of the combustion of a fuel.

A hydrocarbon gas, C3H8, occurring in crude oil, natural gas, and refinery cracking gas. It is used as a fuel, a solvent, and a refrigerant. Propane liquefies under pressure and is the major component of liquefied petroleum (LPG).

The sum of sensible heat and latent heat in a substance above a base temperature, typically 32 degrees Fahrenheit.

An electrically charged atom or group of atoms that has lost or gained electrons; a loss makes the resulting particle positively charged; a gain makes the particle negatively charged.

Major energy consuming sectors of the economy. The Commercial Sector includes commercial buildings and private companies. The Industrial Sector includes manufacturers and processors. The Residential Sector includes private homes. The Transportation Sector ...

The process of changing the structure of the electric power industry from one of guaranteed monopoly over service territories, as established by the Public Utility Holding Company Act of 1935, to one of open competition between power suppliers for custome ...

The component of a central air conditioner that is designed to remove heat absorbed by the refrigerant and transfer it outside the conditioned space.

An amount to be paid for energy periodically by a customer without regard to demand or energy consumption.

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

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

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.

The demand on an energy producing system; the energy consumption or requirement of a piece or group of equipment.

The amount of energy an energy storage device or system can store.

The physical material upon which a photovoltaic cell is applied.

Electric power plant or utility capacity on line and running at low power in excess of actual load.

A closed-loop solar heating system in which the heat transfer fluid in the collector loop drains into a tank or reservoir whenever the booster pump stops to protect the collector loop from freezing.

A water heater that releases hot water from the top of the tank when a hot water tap is opened. To replace that hot water, cold water enters the bottom of the tank to ensure a full tank.

A device used to regulate motor speed, or, in a wind energy conversion system, to control the rotational speed of the rotor.

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 ...

To reduce or avoid the consumption of a resource or commodity.