Any material that can be burned to make energy.

The amount of energy an energy storage device or system can store.

The outer casing of a window that sits in a designated opening of a structure and holds the window panes in place.

Methyl Tertiary Butyl Ether (MTBE) is an ether compound used as a gasoline blending component to raise the oxygen content of gasoline. MTBE is made by combining isobutylene (from various refining and chemical processes) and methanol (usually made from nat ...

The gaseous byproducts of the combustion of a fuel.

A popular term for highly insulating window with a heat loss so low it performs better than an insulated wall in winter, since the sunlight that it admits is greater than its heat loss over a 24 hour period.

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

A type of furnace in which fuel is spread, automatically or mechanically, across the furnace grate.

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 sum of sensible heat and latent heat in a substance above a base temperature, typically 32 degrees Fahrenheit.

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

Water heated for residential washing, bathing, etc.

A turbine that generates power from the combustion of a fuel.

The flow of electrical energy (electricity) in a conductor, measured in amperes.

A small groove scribed into the surface of a solar photovoltaic cell which is filled with metal for contacts.

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

To reduce or avoid the consumption of a resource or commodity.

A heat source, such as a space heater, used to provide more heat than that provided by a primary heating source.

A closed-loop solar heating system in which the heat transfer fluid in the collector loop drains into a tank or reservoir whenever the booster pump stops to protect the collector loop from freezing.

A water heater that releases hot water from the top of the tank when a hot water tap is opened. To replace that hot water, cold water enters the bottom of the tank to ensure a full tank.