A colorless, odorless, tasteless gas composed of one molecule of Carbon and four of hydrogen, which is highly flammable. It is the main constituent of "natural gas" that is formed naturally by methanogenic, anaerobic bacteria or can be manufactured, and w ...

A concrete pad that sits on gravel or crushed rock, well-compacted soil either level with the ground or above the ground.

In reference to solar thermal collectors, the condition where the heat transfer fluid is flowing through the collector loop under normal operating conditions.

Waste water from a household source other than a toilet. This water can be used for landscape irrigation depending upon the source of the greywater.

Turning off or disconnecting loads to limit peak demand.

Pounds/force per square inch gauge.

The sum of the ratings of the electricity consuming apparatus connected to a generating system.

In reference to solar photovoltaic devices, the growth of one crystal on the surface of another crystal. The growth of the deposited crystal is oriented by the lattice structure of the original crystal.

The highest possible pressure in a fuel-air mixture before spontaneous ignition occurs.

Any liquid petroleum product burned for the generation of heat in a furnace or firebox, or for the generation of power in an engine. Domestic (residential) heating fuels are classed as Nos. 1, 2, 3; Industrial fuels as Nos. 4, 5, and 6.

The part of an energy utility's charge based on actual energy consumed by the customer; the product of the kilowatt-hour rate and the total kilowatt-hours consumed.

The ratio of available energy per pound; usually used to compare storage batteries.

An unregulated subsidiary of an electric utility that is allowed to generate and sell wholesale power as an independent energy producer, and is exempt from the Public Utility Holding Company Act of 1935.

A type of lamp that produces light from sodium gas contained in a bulb operating at a partial pressure of 0.13 to 1.3 Pascal. The yellow light and large size make them applicable to lighting streets and parking lots.

Amorphous silicon with a small amount of incorporated hydrogen. The hydrogen neutralizes dangling bonds in the amorphous silicon, allowing charge carriers to flow more freely.

An electric current taking a shorter or different path than intended.

A toilet that uses less water than a standard one during flushing, for the purpose of conserving water resources.

The heat produced by combusting a specific quantity and volume of fuel in an oxygen-bomb colorimeter under specific conditions.

Steam available directly from a boiler under full pressure.

That part of an electricity bill that is based on the amount of electrical energy consumed or supplied.