The amount of heated air, or heating capacity, to be supplied by a heating system; usually the maximum amount to be delivered based on a specified number of heating degree days or design outside temperature.

A battery that uses lithium in the negative electrode and a metal sulfide in the positive electrode, and the electrolyte is molten salt; can store large amounts of energy per unit weight.

A gasifier in which the feedstock (fuel) is suspended by the movement of gas to move it through the gasifier.

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

The highest possible pressure in a fuel-air mixture before spontaneous ignition occurs.

A measure of the surface burning characteristics of a material.

The demand of a consumer of electricity at the time of a power supplier's peak system demand.

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

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

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

A component of a heat pump that reverses the refrigerant's direction of flow, allowing the heat pump to switch from cooling to heating or heating to cooling.

An insulation product made of a fibrous material or plastic foams, pressed or extruded into board-like forms. It provides thermal and acoustical insulation strength with low weight, and coverage with few heat loss paths.

A solar collector in which the absorber is contained in a sealed glass tube, thereby providing for relatively high temperature heat gain.

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

The local climate of specific place or habitat, as influenced by landscape features.

A power plant that generates power by combusting a fuel.

That part of an electricity bill that is based on the amount of electrical energy consumed or supplied.

Power plants, whose output depends on a factor(s) that cannot be controlled by the power generator because they utilize intermittent resources such as solar energy or the wind.

Amorphous silicon with a small amount of incorporated hydrogen. The hydrogen neutralizes dangling bonds in the amorphous silicon, allowing charge carriers to flow more freely.

An electric current taking a shorter or different path than intended.