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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.

Waste-based Energy (WBE):
The process of extracting useful energy from a waste stream

Waste Characterization Study:
An analysis of samples from a waste stream to determine its composition.

Waste Collection:
All the operations involved in collecting waste and channelling it to a transfer or sorting center, incineration plant or landfill.

Waste collector: a person employed by a local authority or a private firm to collect waste from residences, businesses, and community bins.

Waste Dealer: A middleman who buys recyclable materials from waste generators and itinerant buyers and sells them, after sorting and some processing, to wholesale brokers or recycling industries.

Waste Management Hierarchy:
A ranking of waste management operations according to their environmental or energy benefits. The purpose of the waste management hierarchy is to make waste management practices as environmentally sound as possible.

Waste Picker: A person who picks out recyclables from mixed waste wherever it may be temporarily accessible or disposed of.

Waste Prevention: A change in the design, manufacturing, purchase or use of materials or products (including packaging) to reduce their amount of toxicity before they are discarded. Waste prevention also refers to the reuse of products or materials.

Waste Reduction:
All means of reducing the amount of waste that is produced initially and that must be collected by solid waste authorities. This ranges from legislation and product design to local programs designed to keep recyclables and compostables out of the final waste stream.

Waste Residue:
The portion of the waste stream (domestic and commercial) which cannot currently be recovered or recycled

Waste Stream: Specific types of waste found in customer's disposal (trash, cardboard, aluminum and metal) or a more broad definition of disposal type. (e.g. MSW, C&D, Hazardous, etc.).The total flow of waste from a community, region, or facility.

Waste-to-Energy:
Burning of waste to generate steam, heat or electricity.

Waste-to-Energy (WTE) Plant:
A facility that generates steam and/or electricity through the combustion of municipal solid waste. These facilities consist of large incinerator-type operations where trash is incinerated (burned). The heat from this combustion process is converted into high-pressure steam, which can be used to generate electricity for sale to public utility companies under long-term contracts. The residue from the incineration process is disposed of in a Landfill.

Wastewater: Water carrying dissolved or suspended solids from homes, farms, businesses and industries.

Water Heater: An appliance for supplying hot water for purposes other than space heating or pool heating.

Water Table: Level below the earth's surface at which the ground becomes saturated with water.

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.

Watt: A measure of electricity. If you have 10, 100-watt bulbs all on at the same time, the “demand” or instantaneous measure of the power required for the job, is 1,000 watts, also called 1 kilowatt, or kW. If you keep them lit for one full hour, you have used 1,000 watt-hours of electricity, also called a kilowatt-hour or kWh. The typical American home uses about 840 kWh per month.

Watt-Hour:
One watt of power expended for one 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.

Wetland:
An area that is regularly wet or flooded and has a water table that stands at or above the land surface for at least part of the year.

Wheelabrator (WTI): The WMI waste-to-energy facilities are part of Wheelabrator Technologies, Inc. These facilities consist of large incinerator-type operations where trash is incinerated (burned). The heat from this combustion process is converted into high-pressure steam, which can be used to generate electricity for sale to public utility companies under long-term contracts. The residue from the incineration process is disposed of in a Landfill.

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 EP Act).

Windrow:
An elongated pile of aerobically composting materials that are turned periodically to expose the materials to oxygen and to control the temperature to promote biodegradation.

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.

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.

Working Face :
The length and width of the row in which waste is being deposited at a landfill. Also known as the tipping face.

Worin Castings: The material produced from the digestive tracts of worms as they live in earth or compost piles. The castings are rich in nitrates, potassium, phosphorous, calcium, and magnesium.

Worm Culture:
A relatively cool, aerobic composting process that uses worms and microorganisms; also known as viniculture.