The planting, cultivation, and harvesting of a single species of crop in a specified area.

An electronic device that allows current to flow in one direction only.

A vehicle with an engine capable of operating on two different types of fuels.

A heating unit where heat is distributed by means of convection or fans.

An electrical device that resists electric current flow.

A commmon term refering to an electricity transmission and distribution system.

The heat produced by combusting a specific quantity and volume of fuel in an oxygen-bomb colorimeter under specific conditions.

One pound of water in vapor phase; is NOT steam pressure, which is expressed as pounds per square inch (psi).

The component of a solar energy heating system that collects solar radiation, and that contains components to absorb solar radiation and transfer the heat to a heat transfer fluid (air or liquid).

Sunlight scattered by atmospheric particles and gases so that it arrives at the earth's surface from all directions and can not be focused.

The process of converting municipal solid waste to energy and/or recovering materials for recycling.

The part of an energy utility's charge based on actual energy consumed by the customer; the product of the kilowatt-hour rate and the total kilowatt-hours consumed.

A photovoltaic device where incident sunlight is split into different spectral regions, with an optical apparatus, that are directed to individual photovoltaic cells that are optimized for converting that spectrum to electricity.

Air that is returned to a heating or cooling appliance from a heated or cooled space.

The resistance between metallic contacts and the semiconductor.

Ethanol.

The transfer of heat by means of air currents.

The amount of money required to secure a specified cash flow at a future date at a specified return.

The process of storing, or converting energy from one form to another, for later use; storage devices and systems include batteries, conventional and pumped storage hydroelectric, flywheels, compressed gas, and thermal mass.

A popular term used to describe the heating effect due to the trapping of long wave (length) radiation by greenhouse gases produced from natural and human sources.