A light control device that allows light levels to be manually adjusted. A dimmer can save energy by reducing the amount of power delivered to the light while consuming very little themselves.

A mixture of substances that has a melting point lower than that of any mixture of the same substances in other proportions.

An electrically charged atom or group of atoms that has lost or gained electrons; a loss makes the resulting particle positively charged; a gain makes the particle negatively charged.

The amount of energy absorbed (or converted) by a solar collector (or photovoltaic cell or module) over a 15 minute period.

A type of heating appliance that performs more than one function, for example space and water heating.

A complete PV power system composed of the module (or arrary), and balance-of-system (BOS) components including the array supports, electrical conductors/wiring, fuses, safety disconnects, and grounds, charge controllers, inverters, battery storage, etc.

A type of anaerobic digester that has a mechanical mixing system and where temperature and volume are controlled to maximize the anaerobic digestion process for biological waste treatment, methane production, and odor control.

An electrical device that resists electric current flow.

The quantity of heat required to change the temperature of one unit weight of a material by one degree.

The demand on an energy producing system; the energy consumption or requirement of a piece or group of equipment.

Electric power plant or utility capacity on line and running at low power in excess of actual load.

A combustion heating appliance in which heat is captured from the burning of a fuel for distribution, comprised mainly of a combustion chamber and heat exchanger.

A thermostat that can be set to automatically lower temperatures in an unoccupied house and raise them again before the occupant returns.

A term used to describe short and long-term affects on the Earth's climate as a result of human activities such as fossil fuel combustion and vegetation clearing and burning.

Any material that can be burned to make energy.

A complete lighting unit consisting of a lamp(s), housing, and connection to the power circuit.

An amount to be paid for energy periodically by a customer without regard to demand or energy consumption.

A smaller version of standard fluorescent lamps which can directly replace standard incandescent lights. These lights consist of a gas filled tube, and a magnetic or electronic ballast.

A thermodynamic property of a substance, defined as the sum of its internal energy plus the pressure of the substance times its volume, divided by the mechanical equivalent of heat. The total heat content of air; the sum of the enthalpies of dry air and w ...

Materials that prevent or slow down the movement of heat.