A charge for the maximum rate at which energy is used during peak hours of a billing period. That part of a utility service charged for on the basis of the possible demand as distinguished from the energy actually consumed.

The unit of illuminance equivalent to 1lumen per square meter.

Draft that is caused by temperature differences in the air.

Generation of energy at the location where all or most of it will be used.

The process of transmitting electricity over one or more separately owned electric transmission and distribution systems. (See Wholesale and Retail Wheeling.)

The point or outdoor temperature where the heating capacity of a heat pump matches the heating requirements of a building.

A type of turbine in which combusted, pressurized gas is directed against a series of blades connected to a shaft, which forces the shaft to turn to produce mechanical energy.

A group of wind turbines interconnected to a common utility system through a system of transformers, distribution lines, and (usually) one substation. Operation, control, and maintenance functions are often centralized through a network of computerized mo ...

A material that can be used to store thermal energy as latent heat. Various types of materials have been and are being investigated such as inorganic salts, eutectic compounds, and parrafins, for a variety of applications, including solar energy storage ( ...

A light source composed of a metal base, a glass tube filled with an inert gas or a vapor, and base pins to attach to a fixture.

The rate of heat production by a steady current in any part of an electrical circuit that is proportional to the resistance and to the square of the current, or, the internal energy of an ideal gas depends only on its temperature.

A building energy auditing technique used to determine and/or locate air leaks in a building shell or envelope.

A profile of how the wind speed changes with height above the surface of the ground or water.

A material used to seal gaps around windows and exterior doors.

An air conditioner consisting of one or more assemblies that move, clean, cool, and dehumidify air.

A WECS that is used to grind grain, and that typically has a high-solidity rotor; commonly used to refer to all types of WECS.

The approximate energy producing capacity of a power plant, under specified conditions, usually during periods of highest load.

Gasoline fuel additives such as ethanol, ETBE, or MTBE that add extra oxygen to gasoline to reduce carbon monoxide pollution produced by vehicles.

The first law states that energy can not be created or destroyed; the second law states that when a free exchange of heat occurs between two materials, the heat always moves from the warmer to the cooler material.

A substance(s) or pollutant emitted as a result of a process.