Transparent or translucent material (glass or plastic) used to admit light and/or to reduce heat loss; used for building windows, skylights, or greenhouses, or for covering the aperture of a solar collector.

The total diffuse and direct insolation on a horizontal surface, averaged over a specified period of time.

A popular term used to describe the increase in average global temperatures due to the greenhouse effect.

A device used to regulate motor speed, or, in a wind energy conversion system, to control the rotational speed of the rotor.

Ethanol.

To price and sell greenpower/electricity higher than that produced from fossil or nuclear power plants, supposedly because some buyers are willing to pay a premium for greenpower.

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.

Those gases, such as water vapor, carbon dioxide, tropospheric ozone, methane, and low level ozone that are transparent to solar radiation, but opaque to long wave radiation, and which contribute to the greenhouse effect.

A popular term for energy produced from renewable energy resources.

Freshly cut, unseasoned, wood.

Waste water from a household source other than a toilet. This water can be used for landscape irrigation depending upon the source of the greywater.

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.

The total amount of electricity produced by a power plant.

A device used to protect the user of any electrical system or appliance from shock.

Solar radiation reflected from the ground onto a solar collector.

A sinusoidal quantity having a frequency that is an integral multiple of the frequency of a periodic quantity to which it is related.

A unit of pressure for a fluid, commonly used in water pumping and hydropower to express height a pump must lift water, or the distance water falls. Total head accounts for friction head losses, etc.

A form of thermal energy resulting from combustion, chemical reaction, friction, or movement of electricity. As a thermodynamic condition, heat, at a constant pressure, is equal to internal or intrinsic energy plus pressure times volume.

A type of window glass that contains special tints that cause the window to absorb as much as 45% of incoming solar energy, to reduce heat gain in an interior space. Part of the absorbed heat will continue to be passed through the window by conduction and ...