A system that records the consumption of electricity, gas, water, etc, and sends the data to a central data accumulation device.

A device that cuts off the flow of hot or cold air to or from a room as controlled by a thermostat.

Energy required to operate mechanical components of an energy system, or a source of energy or energy supply system to back-up another.

Describes the reliability of power plants. It refers to the number of hours that a power plant is available to produce power divided by the total hours in a set time period, usually a year.

The amount of heat energy that may be converted into useful energy from a fuel.

The total cost of production divided by the total quantity produced.

The demand on, or the power output of, an electrical system or any of its parts over an interval of time, as determined by the total number of kilowatt-hours divided by the units of time in the interval.

The mean wind speed over a specified period of time.

The incremental cost to an electric power producer to generate or purchase a unit of electricity or capacity or both.

An architectural element for shading windows and wall surfaces placed on the exterior of a building; can be fixed or movable.

Fans in which the direction of the flow of the air from inlet to outlet remains unchanged; includes propeller, tubaxail, and vaneaxial type fans.

A type of air compressor in which air is compressed in a series of stages as it flows axaily through a decreasing tubular area.

A turbine in which the flow of a steam or gas is essentially parallel to the rotor axis.

The angle between true south and the point on the horizon directly below the sun.

The flow of air down a flue/chimney and into a house caused by low indoor air pressure that can occur when using several fans or fireplaces and/or if the house is very tight.

A reserve appliance; for example, a standby generator for a home or commercial building.

Single-celled organisms, free-living or parasitic, that break down the wastes and bodies of dead organisms, making their components available for reuse by other organisms.

A device, such as a steel plate, used to check, retard, or divert a flow of a material.

The fibrous material remaining after the extraction of juice from sugarcane; often burned by sugar mills as a source of energy.

An air pollution control device used to filter particulates from waste combustion gases; a chamber containing a bag filter.