 Construction started 12 April 1982 and the 5 new turbine generator units came on-line between 13 April 1985 and 12 April 1986.Units 1 and 2 are Kaplan turbines connected to single-phase generators to produce 25 Hz single-phase electric power for railroad use by Amtrak and SEPTA, but also can be connected to a motor-generator to convert any spare 25 Hz power to 60 Hz.The rest of the units generate 60 Hz, three-phase, power.