In the 1970's, the Washington Public Power Supply System (WPPSS, aka "whoops") began the largest nuclear power plant construction project in U.S. history: reactors 1, 2, and 4 at Hanford, and reactors 3 and 5 at Satsop, west of Olympia. As the budget swelled to $24 billion, and public opinion turned against nuclear power (after Three-Mile Island), the project was cancelled, with only one plant to be completed (at Hanford). At Satsop, construction was well along, and plant number 3 was about 85% complete, with the reactor in place. Cooling towers, 480 feet tall, never saw a breath of steam, and demolition costs are estimated to be in the hundreds of millions. The site has been transformed into a unique business/technology park.