Gang, this had to have been a big plant, with serious capacity. I've been inside a 7 mW "peaker" plant which comes on only when demand is highest (and the power company can get the most for the electricity generated, maybe an hour a month average). It's the size of a 45-foot long trailer pulled by a Volvo or a Mack (trucks). It's a gas turbine--essentially, a jet engine. Completely automated--it can be turned on by a computer command 50 miles away.
This thing was big.
ETA: 620 mW, from a link to Kleen Energy's web site.