Question: WNP-3 and WNP-5 were constructed by the agency formed in which year?

full_context: Document 1: Enron scandal: The Enron scandal, publicized in October 2001, eventually led to the bankruptcy of the Enron Corporation, an American energy company based in Houston, Texas, and the "de facto" dissolution of Arthur Andersen, which was one of the five largest audit and accountancy partnerships in the world. In addition to being the largest bankruptcy reorganization in American history at that time, Enron was cited as the biggest audit failure.
Document 2: Eversource Energy: Eversource Energy (formerly known as Northeast Utilities) is a publicly traded, Fortune 500 energy company headquartered in Hartford, Connecticut and Boston, Massachusetts, with several regulated subsidiaries offering retail electricity and natural gas service to more than 3.6 million customers in Connecticut, Massachusetts and New Hampshire.
Document 3: Energy Northwest: Energy Northwest (formerly Washington Public Power Supply System) is a United States public power joint operating agency formed by State law in 1957 to produce at-cost power for Northwest utilities. Headquartered in Richland, Washington, the WPPSS became commonly known as "Whoops" due to over-commitment to nuclear power in the 1970s which brought about financial collapse and the second largest municipal bond default in U.S. history. WPPSS was renamed Energy Northwest in November 1998. Agency membership includes 28 public power utilities, including 23 of the state’s 24 public utility districts.
Document 4: WNP-1 and WNP-4: 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.
Document 5: NorthWestern Corporation: NorthWestern Corporation owns NorthWestern Energy, a utility company that serves South Dakota, Nebraska, and Montana that is based in Sioux Falls. As of December 31, 2007, the company serves approximately 650,000 customers. The company's corporate headquarters are located in Sioux Falls while the headquarters for the South Dakota operations (and which was the headquarters for the old NorthWestern Public Service Company) are in Huron, SD.
Document 6: NRG Energy: NRG Energy, Inc. is a large American energy company, dual-headquartered in West Windsor Township, New Jersey, and Houston, Texas. It was formerly the wholesale arm of Xcel Energy, and was spun off in bankruptcy in 2004.
Document 7: Northern States Power Company: Northern States Power Company (NYSE: NSP ) was a publicly traded S&P 500 electric and natural gas utility holding company based in Minneapolis, Minnesota that is now a subsidiary of Xcel Energy ().
Document 8: Sibirskaya Nuclear Power Plant: The Siberian Nuclear Power Plant (Sibirskaya Nuclear Power Plant) was built in the city of Seversk (then known as Tomsk-7), Tomsk Oblast. It was the second nuclear power plant in the USSR and the first industrial-scale nuclear power plant in the country (the first NPP, built in Obninsk, had a capacity of only 6 MW).
Document 9: Karachi Nuclear Power Complex: The Karachi Nuclear Power Complex or KNPC is located in Paradise Point, Karachi, Sindh, Pakistan. It consists of the Karachi Nuclear Power Plant (KANUPP) and the Pakistan Atomic Energy Commission's Control & Instrumentation Analysis Lab (CIAL KARACHI). Two new nuclear power plants, KANUPP-2 and KANUPP-3, are also under construction at the site. When complete, the complex of civilian nuclear power plants will produce over 2000 MW of electricity. The International Atomic Energy Agency safeguards and inspects the complex. The plant is under construction by the Pakistan Atomic Energy Commission (PAEC) and is financed by the IAEA, the China Guangdong Nuclear Power Group, the China National Nuclear Corporation, and the China Atomic Energy Authority.
Document 10: Nooksack Falls Hydroelectric Power Plant: The 1500 kilowatt capacity Nooksack Falls Hydroelectric Power Plant was constructed at Nooksack Falls on the Nooksack River in 1906 by Stone & Webster, which is the second oldest operating facility in western Washington. The plant operated for over 90 years and ceased operation in 1997 due to a fire which destroyed the generator. The generator was replaced in 2003 and the plant resumed operations.
Document 11: Washington State University Reactor: The Washington State University Reactor (WSUR) is housed in the Washington State University Nuclear Radiation Center (WSUNRC), and was completed in 1961. The (then) Washington State College Reactor was the brainchild of Harold W. Dodgen, a former researcher on the Manhattan Project where he earned his PhD from 1943 to 1946. He secured funding for the ambitious 'Reactor Project' from the National Science Foundation, the Atomic Energy Commission, and the College administration totaling $479,000 (roughly $3.5 million in today's dollars). Dodgen's basis for constructing a reactor was that the College was primly located as a training facility for the Hanford site, as well as Idaho National Laboratory because there was no other research reactor in the West at that time. After completing the extensive application and design process with the help of contractors from General Electric they broke ground in August 1957 and the first criticality was achieved on March 7, 1961 at a power level of 1W. They gradually increased power over the next year to achieve their maximum licensed operating power of 100 kW.
Document 12: P-9 Project: The P-9 Project was the codename given during World War II to the Manhattan Project's heavy water production program. The Cominco plant at Trail, British Columbia, was upgraded to produce heavy water. DuPont built three plants in the United States: at the Morgantown Ordnance Works, near Morgantown, West Virginia; at the Wabash River Ordnance Works, near Dana and Newport, Indiana; and at the Alabama Ordnance Works, near Childersburg and Sylacauga, Alabama. The American plants operated from 1943 until 1945. The Canadian plant at Trail continued in operation until 1956. Three nuclear reactors were built using the heavy water produced by the P-9 Project: Chicago Pile 3 at Argonne, and ZEEP and NRX at the Chalk River Laboratories in Canada.
Document 13: WNP-3 and WNP-5: 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) 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.
Document 14: Nevada Power Company: Nevada Power Company was a Las Vegas-based company that produced, distributed, and sold electricity in the southern part of the state of Nevada. In 2005, it had over 700,000 electric customers in parts of three Nevada counties — a service area of more than 4000 sqmi . In 1998, Nevada Power merged with Nevada's other major utility, Sierra Pacific Resources. It continued as a subsidiary of Sierra Pacific until 2005, when the company changed its name to NV Energy.
Document 15: Exelon: Exelon Corporation is an American Fortune 100 energy company headquartered in Chicago, Illinois. It generates revenues of approximately $34.5 billion and employs approximately 34,000 people. Exelon is the largest electric holding company in the United States by revenue, the largest regulated utility in the United States with approximately 10 million customers, and is also the largest operator of nuclear power plants in the United States. It was created in October 2000 by the merger of PECO Energy Company and Unicom, of Philadelphia and Chicago respectively. Unicom owned Commonwealth Edison. Exelon operates regulated utilities in Illinois, Pennsylvania, Maryland, Delaware, New Jersey, and Washington, DC. In October 2009, Exelon had full or majority ownership of 17 nuclear reactors in 10 nuclear power plants. Exelon has operations and business activities in 47 states, the District of Columbia and Canada and is the largest competitive U.S. power generator with approximately 35,000 megawatts of owned capacity. Exelon merged with Constellation Energy Group in March 2012 and acquired Pepco Holdings in March 2016. Exelon consists of eight main operating subsidiaries with Exelon Generation, a deregulated energy generator, Constellation, a deregulated competitive energy supplier, and six regulated utilities, Commonwealth Edison (Illinois), Philadelphia Electric Company (Pennsylvania), Baltimore Gas and Electric (Maryland), Delmarva Power & Light (Delaware and Maryland), Atlantic City Electric (New Jersey), and Potomac Electric Power Company (Washington, DC and Maryland).
ground_truth: 1957