Title: List of power stations in Washington
Content:  This is a list of electricity-generating power stations in the U.S. state of Washington, sorted by type and name. These include facilities that are located in more than one state. In 2019, Washington had a total summer capacity of 30,927 MW through all of its power plants, and a net generation of 106,464 GWh. The corresponding electrical energy generation mix was 62.0% hydroelectric, 15.1% natural gas, 8.3% nuclear, 6.7% coal, 6.3% wind, and 1.5% biomass which includes most refuse-derived fuel. Petroleum and utility-scale solar facilities generated most of the remaining 0.1%. Small-scale photovoltaic installations generated an additional net 205 GWh to the state's electrical grid; an amount four times largen than Washington's utility-scale photovoltaic plants. Washington routinely delivers one-quarter of U.S. hydroelectric generation, and hosts the nation's largest capacity power station at Grand Coulee Dam. 60% of Washington households use electricity as their primary heating fuel, unlike most households in other U.S. states that typically utilize natural gas.
Title: Outline of Washington infrastructure
Content: Centralia Power Plant, the only coal fired power plant in the state ; Grays Harbor Biodiesel Plant ; Spokane waste-to-energy plant 
Title: Electric Light Works Building
Content:  Walla Gas Company, it built the Walla Walla River hydroelectric plant, which was one of the pioneering facilities to use significant engineering advances. This gave a new and improved source of power to both Walla Walla and Pendleton. During this time period other hydroelectric plants were being built in Washington because the cheapest available sources of power known were the falls and rapids of the rivers and mountain streams. Washington was in high supply of these, for it had more undeveloped water power within its boundaries than any other state in the Union. This use of hydropower has continued on to this day, with there being 1,233 regulated dams in Washington State.
Title: 2018 Washington Initiative 1631
Content:  in Washington state is derived from renewable sources. A 2017 report by The Washington Post indicated that 68% of electricity generated in Washington state comes from hydropower and 7% is from wind turbines. The same analysis further indicated that only 4% of Washington's energy comes from burning coal, all of which is generated by the Centralia Power Plant. This plant will begin phasing out its two coal boilers beginning in the year 2020 and transition completely to natural gas by the year 2025. Natural gas currently accounts for only 10% of Washington's energy generation, according to the Washington Post analysis. Ultimately, the initiative did not pass during the 2018 November election.
Title: WNP-1 and WNP-4
Content:  '''Washington Nuclear Project Nos. 1 and 4, abbreviated as WNP-1 and WNP-4''' were two of the five nuclear power plants on which construction was started by the Washington Public Power Supply System (WPPSS) in order to meet projected electricity demand in the Pacific Northwest. WNP-1, WNP-2 and WNP-3 were part of the original 1968 plan, with WNP-4 (a twin to WNP-1 and located at the same site) and WNP-5 (a twin to WNP-3, in similar fashion) added in the early 1970s. WNP-1 and -4 are located on 972 acre, within the boundaries of the Hanford Reservation in the U.S. state of Washington, approximately 1.5 mi east of the Columbia Generating Station. The WNP-1 site has been proposed as a potential pilot location for small modular reactors.
Title: WNP-3 and WNP-5
Content:  '''Washington Nuclear Project Nos. 3 and 5, abbreviated as WNP-3 and WNP-5 (collectively known as the Satsop Nuclear Power Plant''') were two of the five nuclear power plants on which construction was started by the Washington Public Power Supply System (WPPSS, also called "Whoops!" ) in order to meet projected electricity demand in the Pacific Northwest. WNP-1, WNP-2 and WNP-3 were part of the original 1968 plan, with WNP-4 (a twin to WNP-1 and located at the same site) and WNP-5 (a twin to WNP-3, in similar fashion) added in the early 1970s. WNP-2 was the only unit of the five that was completed and put into operation. WNP-3 and WNP-5 are located on 1600 acre on the Satsop Site near Elma in Grays Harbor County, Washington (N46° 57.536' W123° 28.163'). Today the site hosts the Satsop Business Park and the Overstock.com Call Center.
Title: Wind power in Washington (state)
Content:  At the end of 2015, the installed capacity of wind power in Washington was 3,075 megawatts (MW) with wind power accounting for 7,101 GWh. In 2016, it reached a generation of 8,041 GWh, comprising 7.1% of the electricity generated in the state. In 2019, it had a capacity of 3,085 MW, responsible for 7.33% of generation.
Title: List of dams and reservoirs in Washington
Content:  This is a list of dams and reservoirs in the U.S. state of Washington, and pertinent data. According to the Washington State Department of Ecology, there are 1166 dams in the state. King County has 124 dams, almost twice as much as any other. The largest dam in Washington, in terms of structural volume, reservoir capacity and electricity production, is the Grand Coulee Dam on the Columbia River. The tallest dam is Mossyrock Dam on the Cowlitz River, at 606 ft. The longest dam is O'Sullivan Dam on Crab Creek, at 19000 ft.
Title: Tri-Cities, Washington
Content:  The Columbia Generating station operates ten miles outside of Richland and is the only nuclear power station in the Pacific Northwest. It uses a boiling water reactor with a type 5 layout and was relicensed 10 years to operate until 2043. After nine years of construction, the plant began operating after a long and costly construction process that resulted in the largest municipal failure in U.S. history. Originally operated and owned by the Washington Public Power Supply System (WPPSS), the coalition changed its name to Energy Northwest in 1998 because of the negative association with the original name (commonly pronounced "Whoops" in place of WPPSS). WPPSS defaulted on $2.25 billion in bonds resulting in payments that exceeded $12,000 per customer, an amount which was finally paid out in 1992 (10 years later). Its 1,190 gross megawatts can power the city of Seattle, and is equivalent to about 10 percent of the electricity generated in Washington and 4 percent of all electricity used in the Pacific Northwest and has several safeguards to protect against seismic, natural, or terrorist threats.
Title: Wind power in Washington (state)
Content:  The National Renewable Energy Laboratory estimates that Washington has potential to install over 18,000 megawatts of onshore wind power. Washington ranks 24th in its potential for onshore wind generation, and also has the potential to install 120,964 MW of offshore wind generation which could generate 488,025 GWh/year.

Question: how many nuclear power plants in washington state?
Answer: 3.