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

The cutting of a grid pattern of grooves in a semiconductor material, generally for the purpose of making interconnections.

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

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.

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

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

Draft that is caused by temperature differences in the air.

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

A type of wind turbine in which the axis of rotation is perpendicular to the wind stream and the ground.

Houses that have earth berms around exterior walls.

A unit of rate of water evaporation equal to the evaporation per hour of 34.5 pounds of water at a temperature of 212 degrees Fahrenheit into steam at 212 degrees F.

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 ...

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.

A term used for a wind energy conversion device that produces electricity; typically having one, two, or three blades.

see Peak Power

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

Waste material from households and businesses in a community that is not regulated as hazardous.

A unit of electrical capacitance; the capacitance of a capacitor between the plates of which there appears a difference of 1 Volt when it is charged by one coulomb of electricity.

A device for converting a solid fuel to a gaseous fuel.

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.