A type of water heater that has no storage tank thus eliminating storage tank standby losses. Cold water travels through a pipe into the unit, and either a gas burner or an electric element heats the water only when needed.

A machine for converting mechanical energy into electrical energy by magneto-electric induction; may be used as a motor.

The change in direction of a ray of light when it passes through one media to another with differing optical densities.

One thousand kilowatts, or 1 million watts; standard measure of electric power plant generating capacity.

A unit of power equal to 1 billion Watts; 1 million kilowatts, or 1,000 Megawatts.

The process of characterizing the wind resource, and its energy potential, for a specific site or geographical area.

A gas or liquid used to move heat energy from one place to another; a refrigerant.

A motor in which a three phase (or any multiphase) alternating current (i.e. the working current) is supplied to iron-cored coils (or windings) within the stator. As a result, a rotating magnetic field is set up, which induces a magnetizing current in the ...

The ratio of the minimum amount of work or energy required to perform a task to the amount actually used.

A wood-burning appliance for space and/or water heating and/or cooking.

A building design that uses structural elements of a building to heat and cool a building, without the use of mechanical equipment, which requires careful consideration of the local climate and solar energy resource, building orientation, and landscape fe ...

Those privately or publicly owned establishments that generate, transmit, distribute, or sell electricity.

Alternating current in which three separate pulses are present, identical in frequency and voltage, but separated 120 degrees in phase.

The amount (percent) of light that is reflected by a surface relative to the amount that strikes it.

A mathematical representation of the frequency or ratio that specific wind speeds occur within a specified time interval.

In reference to a wind energy conversion system, the area of a turbine blade surface that first comes into contact with the wind.

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

Energy output from a system that equals energy input.

The products of all combustion processes formed by the combination of nitrogen and oxygen.

An electricity generating facility that uses geothermal energy.