The practice of using a single meter to measure consumption and generation of electricity by a small generation facility (such as a house with a wind or solar photovoltaic system). The net energy produced or consumed is purchased from or sold to the gener ...

The coldest months of the year; months where average daily temperatures fall below 65 degrees Fahrenheit creating demand for indoor space heating.

The ability of a building construction assembly (partition, wall, floor, etc.) to resist the passage of fire. The rating is expressed in hours.

A wood or gas burning heating appliance that fits into the opening or protrudes on to the hearth of a conventional fireplace.

A type of motor that has a rotor with electrical windings connected through slip rings to the external power circuit. An external resistance controller in the rotor circuit allows the performance of the motor to be tailored to the needs of the system and ...

A measure of the efficiency of an appliance's energy efficiency.

A unit or measure of electricity supply or consumption of 1,000 Watts over the period of one hour; equivalent to 3,412 Btu.

This is an independent regulatory agency within the U.S. DOE that has jurisdiction over interstate electricity sales, wholesale electric rates, natural gas pricing, oil pipeline rates, and gas pipeline certification. It also licenses and inspects private, ...

The process of breaking down organic material; reduction of the net energy level and change in physical and chemical composition of organic material.

Energy supplied during periods of relatively high system demands as specified by the supplier.

Features and vegetation on the outside of or surrounding a building for aesthetics and energy conservation.

A type of motor designed to operate precisely at the synchronous speed with no slip in the full-load speeds (rpm).

A measure of the amount of light incident on a surface; measured in foot-candles or Lux.

A material applied to window panes that controls heat gain and loss, reduces glare, minimizes fabric fading, and provides privacy. These films are retrofitted on existing windows.

The absolute centimeter-gram-second unit of force; that force that will impart to a free mass of one gram an acceleration of one centimeter per second per second.

The transfer of heat through matter or space by means of electromagnetic waves.

A type of heating system where heat, resulting when electric current flows through an "element" or conductor, such as Nichrome, which has a high resistance, is radiated to a room.

All the components of the appliance used to condition interior air of a building.

An electrochemical battery that uses lead and lead oxide for electrodes and sulfuric acid for the electrolyte.

The force that pulls a wind turbine blade, as opposed to drag.