The total distribution of electromagnetic radiation emanating from the sun. The different regions of the solar spectrum are described by their wavelength range. The visible region extends from about 390 to 780 nanometers (a nanometer is one billionth of o ...

The amount of energy produced as a percentage of the amount of energy consumed.

The region between an n-layer and a p-layer in a single material, photovoltaic cell.

A window located on the roof of a structure to provide interior building spaces with natural daylight, warmth, and ventilation.

A type of anaerobic digester that has a horizontal tank in which a constant volume of material is added and forces material in the tank to move through the tank and be digested.

A plot of a wind energy conversion device's power output versus wind speed.

Freshly cut, unseasoned, wood.

A coating applied to the surface of the glazing of a window to reduce heat transfer through the window.

A measure of the unavailable or unusable energy in a system; energy that cannot be converted to another form.

The fossil fuels: coal, oil, and natural gas.

A method of financial and economic analysis used to determine present and future values of investments or expenses.

The mean distance a free electron or hole moves before recombining with another hole or electron.

Energy that is capable or available for doing work; the time rate at which work is performed, measured in horsepower, Watts, or Btu per hour. Electric power is the product of electric current and electromotive force.

A commonly used analysis for reporting fuel properties; may be on a dry (moisture free) basis, as "fired", or on an ash and moisture free basis. Fractions usually reported include: volatile matter, fixed carbon, moisture, ash, and heating value (higher he ...

A water and energy conserving device that limits the amount of water that a faucet or showerhead can deliver.

A chemical element, of atomic number 14, that is semi-metallic, and an excellent semiconductor material used in solar photovoltaic devices; commonly found in sand.

The interior area of a building, calculated in square feet or meters.

A law to protect consumers and investors. It placed geographic restrictions on mergers and limitations on diversification into non-utility lines of business and takeovers of electric and gas utilities, and also established regulated monopoly markets or se ...

The power required to energize the magnetic field of a generator.

Wind turbines that operate at a constant rotor revolutions per minute (RPM) and are optimized for energy capture at a given rotor diameter at a particular speed in the wind power curve.