Waste water from a household source other than a toilet. This water can be used for landscape irrigation depending upon the source of the greywater.

A group of solar photovoltaic modules connected together.

Infrared or radiant heat.

The vacancy where an electron would normally exist in a solid; behaves like a positively charged particle.

An automatic valve that is opened or closed by an electromagnet.

The temperature of the air as measured by a standard thermometer.

A nationally recognized energy rating program that gives builders, mortgage lenders, secondary lending markets, homeowners, sellers, and buyers a precise evaluation of energy losing deficiency's in homes. Builders can use this system to gauge the energy q ...

A load management objective that moves loads from on-peak periods to off-peak periods.

A type of inverter that produces square wave output.; consists of a DC source, four switches, and the load. The switches are power semiconductors that can carry a large current and withstand a high voltage rating. The switches are turned on and off at a c ...

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

The amount of conditioned air to be supplied by a cooling system; usually the maximum amount to be delivered based on a specified number of cooling degree days or design temperature.

A curve that displays load values on the horizontal axis in descending order of magnitude against the percent of time (on the vertical axis) that the load values are exceeded.

The heat produced by combusting a specific quantity and volume of fuel in an oxygen-bomb colorimeter under specific conditions.

A method of controlling a wind turbine's speed by varying the orientation, or pitch, of the blades, and thereby altering its aerodynamics and efficiency.

The sum of the ratings of the electricity consuming apparatus connected to a generating system.

A toilet that uses less water than a standard one during flushing, for the purpose of conserving water resources.

A concrete pad that sits on gravel or crushed rock, well-compacted soil either level with the ground or above the ground.

A law that requires electric utilities to purchase electricity produced from qualifying power producers that use renewable energy resources or are cogenerators. Utilities are required to purchase power at a rate equal to the avoided cost of generating the ...

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.

The number of revolutions that the motor turns in a given time period (i.e. revolutions per minute, rpm).