The wind speed with 50 percent probability of occurring.

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 class of power generator that is not a regulated utility and that has generating plants for the purpose of supplying electric power required in the conduct of their industrial and commercial operations.

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.

The discomfort or interference with visual perception when viewing a bright object against a dark background.

The use of devices to limit or prevent the release of pollution into the atmosphere.

Standardized weights or volumes for heating fuels.

A generic term for an electrical conductor.

A unit used to rate the performance of a solar photovoltaic (PV) cells, modules, or arrays; the maximum nominal output of a PV device, in Watts (Wp) under standardized test conditions, usually 1000 Watts per square meter of sunlight with other conditions, ...

The ratio of a photovoltaic cell's actual power to its power if both current and voltage were at their maxima. A key characteristic in evaluating cell performance.

An idealized process in which a working fluid (water, air, ammonia, etc) successively changes its state (from a liquid to a gas and back to a liquid) for the purpose of producing useful work or energy, or transferring energy.

A refined petroleum product suitable for use as a fuel in internal combustion engines.

A turbine that is driven by high velocity jets of water or steam from a nozzle directed to vanes or buckets attached to a wheel. (A pelton wheel is an impulse hydroturbine).

Any gaseous, liquid, or solid fuel used for indoor space heating.

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

A water heater that heats water before it is directly distributed for end use as required; a demand water heater.

The path followed by electrons from a generation source, through an electrical system, and returning to the source.

A house built into the ground or slope of a hill, or which has most or all exterior surfaces covered with earth.

A construction element used for ceiling support.

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