A type of hydroelectric facility that uses the river flow with very little alteration and little or no impoundment of the water.

An empirical measure of the quantity of light. It is based upon the spectral sensitivity of the photosensors in the human eye under high (daytime) light levels. Photometrically it is the luminous flux emitted with a solid angle (1 steradian) by a point so ...

Major energy consuming sectors of the economy. The Commercial Sector includes commercial buildings and private companies. The Industrial Sector includes manufacturers and processors. The Residential Sector includes private homes. The Transportation Sector ...

A turbine that generates power from the combustion of a fuel.

An exterior door that protects the primary door.

The ratio of the electric power produced by a photovoltaic device to the power of the sunlight incident on the device.

The losses that result from inherent resistance in electrical conductors and transformation inefficiencies in distribution transformers in a transmission and distribution network.

The nominal voltage for which a conductor or electrical appliance is designed; the reference voltage for identification and not necessarily the precise voltage at which it operates.

A computer software program that simulates energy consumption of commercial buildings; used for design and auditing purposes.

Large, flat boxes with glass covers and dark-colored metal plates inside that absorb and transfer solar energy to a heat transfer fluid.

The measure of closeness in shape between a waveform and it's fundamental component.

In a solar photovoltaic device, an n-type dopant, such as phosphorus, that puts an additional electron into an energy level very near the conduction band; this electron is easily exited into the conduction band where it increases the electrical conductivi ...

Glass, plastic panels, or plastic sheets that reduce air infiltration and some heat loss when attached to either the interior or exterior of existing windows.

The process of modifying a building's structure.

Turbines in which the axis of the rotor's rotation is parallel to the wind stream and the ground.

The physical material upon which a photovoltaic cell is applied.

The ratio of power produced by a wind energy conversion device to the power in a reference area of the free windstream.

A device used to maintain a specified humidity in a conditioned space.

The amount of energy an energy storage device or system can store.

The total amount of electricity produced by a power plant.