Glossary of Energy Terms

Click on the alphabet letter you wish to go to.

A B C D E F G H I J K L M N O P Q R S T U V W X-Z Acronyms

Note: No entries for Y or Z.

Letter W

WARRANTY-- A seller's guarantee to purchaser that product is what it is represented to be and, if it is not, that it will be repaired or replaced. Within the context of vehicles, refers to an engine manufacturer's guarantee that the engine will meet "certified" engine standards at 50,000 miles or the engine will be replaced. Retrofits may generally void an engine warranty.

WATER HEATER -- An appliance for supplying hot water for purposes other than space heating or pool heating. [See California Code of Regulations, Title 20, Section 1602(f)(8)]

WATSCO -- The Western Association for Transmission System Coordination.

WATT -- A unit of measure of electric power at a point in time, as capacity or demand. One watt of power maintained over time is equal to one joule per second. Some Christmas tree lights use one watt. The Watt is named after Scottish inventor James Watt and is capitalized when shortened to w and used with other abbreviations, as in kWh.

WATT-HOUR -- One watt of power expended for one hour. One thousandth of a kilowatt-hour.

WEATHERSTRIPPING -- Specially designed strips, seals and gaskets installed around doors and windows to limit air leakage.

WET-BULB TEMPERATURE -- The temperature at which water, by evaporating into air, can bring the air to saturation at the same temperature. Wet-bulb temperature is measured by a wet-bulb psychrometer.

WHEELING -- The transmission of electricity by an entity that does not own or directly use the power it is transmitting. Wholesale wheeling is used to indicate bulk transactions in the wholesale market, whereas retail wheeling allows power producers direct access to retail customers. This term is often used colloquially as meaning transmission.

WHOLE HOUSE FAN -- A system capable of cooling a house by exhausting a large volume of warm air when the outside air is cool.

WHOLESALE COMPETITION -- A system whereby a distributor of power would have the option to buy its power from a variety of power producers, and the power producers would be able to compete to sell their power to a variety of distribution companies.

WHOLESALE POWER MARKET -- The purchase and sale of electricity from generators to resellers (who sell to retail customers) along with the ancillary services needed to maintain reliability and power quality at the transmission level.

WHOLESALE TRANSMISSION SERVICES -- The transmission of electric energy sold, or to be sold, at wholesale in interstate commerce (from EPAct).

WOBBE INDEX -- A measure of the amount of heat released by a gas burner with a constant orifice, equal to the gross calorific value of the gas in British thermal units per cubic foot at standard temperature and pressure divided by the square root of the specific gravity of the gas. The index is an indicator of the quality of the fuel gas

WIRES CHARGE -- A broad term which refers to charges levied on power suppliers or their customers for the use of the transmission or distribution wires.

WRTA -- The Western Regional Transmission Association, an RTG.

WSSCC -- The Western System Coordinating Council. A voluntary industry association created to enhance reliability among western utilities.

WSSP -- The Western Systems Power Pool. A FERC approved industry institution that provides a forum for short-term trades in electric energy, capacity, exchanges and transmission services. The pool consists of approximately 50 members and serves 22 states, a Canadian province and 60 million people. The WSSP is headquarter in Phoenix, Arizona.

A B C D E F G H I J K L M N O P Q R S T U V W X-Z Acronyms

Return to Glossary Page