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

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 highest possible pressure in a fuel-air mixture before spontaneous ignition occurs.

Nonglossy paint with a relatively high absorptance.

Solar radiation reflected from the ground onto a solar collector.

An insulation product made of a fibrous material or plastic foams, pressed or extruded into board-like forms. It provides thermal and acoustical insulation strength with low weight, and coverage with few heat loss paths.

A term used to describe a technologically advanced window system that contains glazing that can change or switch its optical qualities when a low voltage electrical signal is applied to it, or in response to changes in heat or light.

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

The ability to dispatch power.

A popular term used for an evaporative cooling device.

That part of an electricity bill that is based on the amount of electrical energy consumed or supplied.

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 local climate of specific place or habitat, as influenced by landscape features.

Fabricated as a single structure.

A gasifier in which the feedstock (fuel) is suspended by the movement of gas to move it through the gasifier.

Legal documents that regulate construction to protect the health, safety, and welfare of people. Codes establish minimum standards but do not guarantee efficiency or quality.

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

A popular term used to describe the heating effect due to the trapping of long wave (length) radiation by greenhouse gases produced from natural and human sources.

An electronic device that allows current to flow in one direction only.

A type of solar thermal system where sunlight is concentrated by a curved reflector onto a pipe containing a working fluid that can be used for process heat or to produce electricity. The world's largest solar thermal electric power plants use solar troug ...