Question: In how many nuclear power projects of Washington Nuclear Project  the Energy Northwest started construction?
Sentence (from "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.
Relevant evidence: Yes