A measure of the moisture content of air; may be expressed as absolute, mixing ratio, saturation deficit, relative, or specific.

Any wholly or partially enclosed space in which combustion takes place.

A particle of light that acts as an individual unit of energy.

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 group of solar photovoltaic modules connected together.

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 cooling device that uses mechanical energy to produce chilled water.

This type of heat pump is known as an air-to air system.

A utility owned by stockholders or other investors; sometimes referred to as a private utility, in contrast to a public utility that is owned by a government agency or cooperative.

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

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

The highest wind speed at which a wind turbine stops producing power.

A device or material with a high resistance to electricity flow.

Air that provides the necessary oxygen for complete, clean combustion and maximum heating value.

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.

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.

The vacancy where an electron would normally exist in a solid; behaves like a positively charged particle.

Solar Two is a retrofit of the Solar One project (see above). It is demonstrating the technical feasibility and power potential of a solar power tower using advanced molten-salt technology to store energy. Solar Two retains several of the main components ...

The demand of a consumer of electricity at the time of a power supplier's peak system demand.

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.