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

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

A system of astronomical time in which the sun crosses the true north-south meridian at 12 noon, and which differs from local time according to longitude, time zone, and equation of time.

Standardized codes used to classify businesses by type of activity they engage in.

The device in an air conditioner or heat pump in which the refrigerant condenses from a gas to a liquid when it is depressurized or cooled.

A cooling device that uses mechanical energy to produce chilled water.

Infrared or radiant heat.

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

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

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

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

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.

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

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

A solar collector in which the absorber is contained in a sealed glass tube, thereby providing for relatively high temperature heat gain.

A type of combustion heating system in which combustion air is drawn directly from outside and the products of combustion are vented directly outside. These features are beneficial in tight, energy-efficient homes because they will not depressurize a home ...

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