The production of electrical current from light.

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

The prevailing or average weather conditions of a geographic region.

To reduce or avoid the consumption of a resource or commodity.

In reference to wind energy, for any given instant, the power available in the wind is proportional to the cube of the wind velocity; when wind speed doubles, the power availability increases eight times.

An engine in which fuel is burned (or heat is applied) to the outside of a cylinder; a Stirling engine.

The physical measure of the subjective sensation of brightness; measured in lumens.

A class of energy producer that produces both heat and electricity from a single fuel.

An instrument for measuring relative humidity by means of wet and dry-bulb temperatures.

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

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 ...

The volume of a unit weight of a substance at a specific temperature and pressure.

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

The abrupt and large increase in electrical conductivity exhibited by some metals as the temperature approaches absolute zero.

Transmit high-voltage electricity from the transformer to the electric distribution system.

A value that describes the ability of a material to conduct heat. The number of Btu that flow through 1 square foot of material, in one hour. It is the reciprocal of the R-Value (U-Value = 1/R-Value).

A hydrocarbon gas, C3H8, occurring in crude oil, natural gas, and refinery cracking gas. It is used as a fuel, a solvent, and a refrigerant. Propane liquefies under pressure and is the major component of liquefied petroleum (LPG).

A solar collector that uses reflective surfaces to concentrate sunlight onto a small area, where it is absorbed and converted to heat or, in the case of solar photovoltaic (PV) devices, into electricity. Concentrators can increase the power flux of sunlig ...

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.

In refrigeration, an evaporating temperature of 5 degrees Fahrenheit (F), a condensing temperature of 86 degrees F., liquid temperature before expansion of 77 degrees F., and suction temperature of 12 degrees F.