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

A drag-type wind machine that can react to wind from any direction.

A device that measures the intensity of direct beam solar radiation.

A type of insulation, composed of small diameter pink, yellow, or white glass fibers, formed into blankets or batts, or used in loose-fill and blown-in applications.

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.

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

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

A turbine that uses water pressure to rotate its blades; the primary types are the Pelton wheel, for high heads (pressure); the Francis turbine, for low to medium heads; and the Kaplan for a wide range of heads. Primarily used to power an electric generat ...

Any light source designed specifically to direct light a task or work performed by a person or machine.

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.

A column of burning combustion gases that are so hot and strong that the heat is lost up the chimney before it can be transferred to the house. A draft brings air to the fire to help keep it burning.

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

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

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.

The heat absorbed or released when a substance undergoes a change in temperature.

Those elements of building used to control the interior climate.

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

A device mounted in the vent connector that closes the vent when the heating unit is not firing. This traps heat inside the heating system and house rather than letting it draft up and out the vent system.

The pressure of the steam or water in a boiler as measured; usually expressed in pounds per square inch gauge (psig).

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