The process of using heat that is rejected in one part of a cycle for another function or in another part of the cycle.

The ratio of the percentage change in the quantity of a good or service demanded to the percentage change in the price.

A device consisting of two dissimilar conductors with their ends connected together. When the two junctions are at different temperatures, a small voltage is generated.

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 ...

One thousand kilowatt-hours or 1 million watt-hours.

A device that converts heat or sunlight directly to electricity, invented by Standford Ovshinsky, that has a unique glass composition that changes from an electrically non-conducting state to a semiconducting state.

The distance between similar points on successive waves.

The total amount of electric energy loss in an electric system between the generation source and points of delivery.

The heat that flows from the building interior, through the building envelope to the outside environment.

A device used to measure total incident solar radiation (direct beam, diffuse, and reflected radiation) per unit time per unit area.

The process of the absorption of heat from one location and its transfer to another for rejection or recuperation.

The rate at which electricity is delivered to or by a system, part of a system, or piece of equipment expressed in kilowatts, kilovoltamperes, or other suitable unit, at a given instant or averaged over a specified period of time.

A valve used to mix heated water with cold in a heating system to provide a desired water temperature for end use.

Solid fuels made from primarily wood sawdust that is compacted under high pressure to form small (about the size of rabbit feed) pellets for use in a pellet stove.

A generic term for an electrical conductor.

This is a national organization dedicated to representing the interests of cooperative electric utilities and the consumers they serve. Members come from the 46 states that have an electric distribution cooperative.

A hydropower plant that is operated at maximum allowable capacity for part of the day and is either shut down for the remainder of the time or operated at minimal capacity level.

The coldest months of the year; months where average daily temperatures fall below 65 degrees Fahrenheit creating demand for indoor space heating.

This designates the resistance of a material to heat conduction. The greater the R-value the larger the number.

The alignment of a building along a given axis to face a specific geographical direction. The alignment of a solar collector, in number of degrees east or west of true south.