Question: WNP-3 and WNP-5 were constructed by the agency formed in which year?
Sentence (from "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.
Relevant evidence: Yes