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War of the currents
The War of the currents was the late-1880s American rivalry between Thomas Edison's direct current and George Westinghouse's alternating current, which prevailed after the 1893 Chicago World's Fair.
Wara Coal Mine
Wara Coal Mine is a large open-pit thermal coal mine in Tabalong regency, South Kalimantan, Indonesia, operated by PT Adaro Indonesia. It began commercial production in 2010 and yielded 7.0 million tonnes in 2024.
Warren County power station
The Warren County power station is a 1,329 MW natural gas-fired combined-cycle plant owned by Dominion in Warren County near Front Royal, Virginia, opened in 2014.
Warrior Run (power plant)
Warrior Run, formally the AES Warrior Run Generating Station, is a 205 MW coal-fired power plant near Cumberland, Maryland, owned by AES, which ran from 2000 until 2024.
Wärtsilä 31
The Wärtsilä 31 is a Finnish marine and power-plant engine, launched in 2015 and recognized by Guinness World Records as the most efficient 4-stroke diesel engine.
WASH-1400
WASH-1400, formally the Reactor Safety Study and often called the Rasmussen Report, is a 1975 Nuclear Regulatory Commission report that founded probabilistic risk assessment in the nuclear industry.
Washington Gas
Washington Gas, formally the Washington Gas Light Company, is a regulated natural gas utility serving Washington, D.C., and parts of Maryland and Virginia since 1848, serving over 1.2 million customers.
Washington Public Power Supply System
The Washington Public Power Supply System (WPPSS) was a Washington utility consortium whose 1983 default of $2.25 billion in bonds was the largest in U.S. history.
Waskahigan Oil and Gas Field
Waskahigan Oil and Gas Field is an operating onshore oil and gas field in west-central Alberta, Canada, producing light oil and gas from the Montney Formation.
Wassit power station
Wassit power station, also known as the Zubaydiyah thermal power station, is an oil-fired power station of at least 2,540 MW in Wasit governorate, Iraq.
Waste Disposal Facilities
Waste disposal facilities, mainly municipal solid waste landfills and waste-to-energy incinerators, are engineered sites for managing residual waste. Key facts: RCRA closed US open dumps; 42 USC 7429 sets incinerator emission limits; Chinese cities show inverted-U capacity versus GDP per capita.
Waste heat boiler
A waste heat boiler is a boiler that makes steam, hot water, or thermal oil from hot exhaust gases of industrial processes and engines, recovering heat otherwise vented.
Waste heat recovery
Waste heat recovery (WHR) is the capture and reuse of thermal energy that industrial processes, power plants, or building systems would otherwise reject to the environment.
Waste heat recovery unit
A waste heat recovery unit (WHRU) is heat-transfer equipment that captures heat from industrial exhaust to produce steam or heated water, cutting fuel use and emissions.
Waste Treatment Plant (Hanford)
The Waste Treatment Plant is a Department of Energy facility at the Hanford Site in Washington state that converts radioactive tank waste into glass, built by Bechtel.
Waste-to-energy
Waste-to-energy (WtE), also called energy-from-waste or thermal recycling, is the recovery of energy from municipal solid waste, most commonly mass-burn incineration; over 3,100 plants worldwide operated as of early 2025.
Wataynikaneyap Power
Wataynikaneyap Power is an electricity transmission company in northwestern Ontario, majority owned by 24 First Nations with Fortis Inc., connecting remote communities to the provincial grid to end diesel reliance.
Water and Power Development Authority (Pakistan)
The Water and Power Development Authority (WAPDA) is a Pakistani state-owned statutory body, established by act of parliament in 1958 and headquartered in Lahore, responsible for water resources and hydropower.
Water gas
Water gas, also called blue gas, is a manufactured fuel gas of carbon monoxide and hydrogen made by passing steam over incandescent carbon, first industrialized in 1873.
Water heating
Water heating, or direct water heating, raises household water temperature using storage, tankless, heat pump, or solar water heaters fueled by electricity, gas, or solar energy, and accounts for roughly 13% of US residential energy use.
Water scrubbing
Water scrubbing is a biogas upgrading technique that removes carbon dioxide and hydrogen sulfide from raw biogas with pressurized water, producing biomethane for grid injection or vehicle fuel.
Water shut-off
Water shut-off is a set of petroleum-engineering treatments, mechanical or chemical, that reduce or stop unwanted water production from an oil or gas well, or divert injected water.
Water splitting
Water splitting, also known as decomposing water, is the chemical separation of water into hydrogen and oxygen, first achieved by electricity in 1789 and today the basis of hydrogen production by electrolysis.
Water treeing
Water treeing is a degradation process in polymeric power cable insulation, chiefly XLPE, where tree-shaped regions of water-filled microcavities grow slowly under an alternating electric field.
Water turbine
A water turbine, also known as a hydraulic turbine, converts the energy of flowing or falling water into mechanical power, usually to drive an electrical generator in a hydroelectric plant. Types include Francis, Kaplan, and Pelton.
Water wheel
A water wheel, also known as a mill wheel, converts the energy of flowing or falling water into rotary power and was the chief source of mill power for over 2,000 years.
Water-alternating-gas injection
Water-alternating-gas (WAG) injection is an enhanced oil recovery method that injects water and gas into a reservoir in alternating slugs, displacing oil toward production wells and improving sweep efficiency.
Water-in-salt electrolyte
A water-in-salt electrolyte (WiSE) is a highly concentrated aqueous battery electrolyte in which dissolved salt exceeds the water in weight and volume, first proposed in 2015 at the University of Maryland.
Water-tube boiler
A water-tube boiler is a steam boiler in which water flows inside tubes surrounded by hot gases, generating steam at far higher pressures than fire-tube boilers.
Waterberg Coal Project
The Waterberg Coal Project is a proposed coal mine in Limpopo Province, South Africa, planned to supply ten million tonnes of coal a year to Eskom.