A method of controlling a wind turbine's speed by varying the orientation, or pitch, of the blades, and thereby altering its aerodynamics and efficiency.

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

A concrete pad that sits on gravel or crushed rock, well-compacted soil either level with the ground or above the ground.

A generator with a single armature coil, which may have many turns and the alternating current output consists of a succession of cycles.

Legislation authorizing a U.S. biomass and alcohol fuel program, and that authorized loan guarantees and price guarantees and purchase agreements for alcohol fuel production.

A means of billing electric power consumers to pay for the costs of demand side management/energy conservation measures and programs. (See also Benefits Charge.)

A unit of pressure [hydraulic (liquid) or pneumatic (gas)] that does not include atmospheric pressure.

A chemical element that can be used as a fuel since it has a very high energy content.

The solar power density incident on a surface of stated area and orientation, usually expressed as Watts per square meter or Btu per square foot per hour.

Pounds of pressure per square inch.

A pre-cut layer of insulation applied around a water heater storage tank to reduce standby heat loss from the tank.

The ability of an electric power consumer to purchase electricity from a supplier of their choice without being physically inhibited by the owner of the electric distribution and transmission system to which the consumer is connected to. (See also Open Ac ...

The deferment of certain loads to limit electrical power demand, or the production of energy during off-peak periods for storage and use during peak demand periods.

A curve on a chart showing power (kW) supplied (on the horizontal axis) plotted against time of occurrence (on the vertical axis) to illustrate the variance in a load in a specified time period.

The part of an energy utility's charge based on actual energy consumed by the customer; the product of the kilowatt-hour rate and the total kilowatt-hours consumed.

Categories of energy consumers, as defined by consumption or demand levels, patterns, and conditions, and generally included residential, commercial, industrial, agricultural.

The amount of power density in sunlight received at the earth's surface at noon on a clear day (about 1,000 Watts/square meter).

A plan developed by an electric utility, sometimes as required by a public regulatory commission or agency, that defines the short and long term capacity additions (supply side) and demand side management programs that it will undertake to meet projected ...

A solar heating system that preheats water or air that is then heated more by another heating appliance.

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