The quantity of heat produced to change a unit weight of a liquid to vapor with no change in temperature.

The process of managing the consumption of energy, generally to optimize available and planned generation resources.

A group of wind turbines interconnected to a common utility system through a system of transformers, distribution lines, and (usually) one substation. Operation, control, and maintenance functions are often centralized through a network of computerized mo ...

A furnace/combustion chamber in which finely ground fuel is blown in spirals in the combustion chamber to maximize combustion efficiency.

A type of lamp having a lens of heavy durable glass that focuses the light. They have longer lifetimes with less lumen depreciation than standard incandescents.

A layer of semiconductor material, such as copper indium diselenide or gallium arsenide, a few microns or less in thickness, used to make solar photovoltaic cells.

A material applied to window panes that controls heat gain and loss, reduces glare, minimizes fabric fading, and provides privacy. These films are retrofitted on existing windows.

A type of turbine in which combusted, pressurized gas is directed against a series of blades connected to a shaft, which forces the shaft to turn to produce mechanical energy.

The transfer of heat through matter or space by means of electromagnetic waves.

This is an independent regulatory agency within the U.S. DOE that has jurisdiction over interstate electricity sales, wholesale electric rates, natural gas pricing, oil pipeline rates, and gas pipeline certification. It also licenses and inspects private, ...

Air brought into a building from outside to replace exhaust air.

A system capable of rotating about one axis.

The ability of a building construction assembly (partition, wall, floor, etc.) to resist the passage of fire. The rating is expressed in hours.

The concept of capturing and converting the energy available in the motion of ocean waves to energy.

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.

The ratio of the radiant energy (heat) leaving (being emitted by) a surface to that of a black body at the same temperature and with the same area; expressed as a number between 0 and 1.

A way of joining photovoltaic cells by connecting positive leads to negative leads; such a configuration increases the voltage.

A raw material that can be converted to one or more products.

A curve that indicates the number of hours per year that specific wind speeds occur.

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