Neckarwestheim Nuclear Power Station is a nuclear power plant in Neckarwestheim, Germany. It is sometimes abbreviated GKN (for Gemeinschaftskraftwerk Neckar). It is operated by EnBW Kernkraft GmbH.GKN 1The nominal electrical power of block I, in service since 1976, is 840 megawatts. The 50 Hz three phase AC power is 567 megawatts and for the 16.7 Hz traction current power 174 MW. The traction current generator is the world's largest single-phase AC generators. The generator block 1 is rated 21,000 volts at a current of 27,000 amperes, and the traction current generator is rated 14,500 volts and a current of 12,000 amperes. The current produced by the generators is stepped up to 220 kilovolts (three-phase alternating current) or 110 kilovolts (single-phase traction current) with the unit transformers. Block I was the only nuclear power station which produces traction current. Block I was shut down on March 17, 2011 for a three-month moratorium on nuclear power, an announcement on May 30, 2011 named block I as a unit that would not be returning to service.GKN 2The nominal electrical power of block 2, in service since 1988, is 1400 megawatts. The generator produces 50 Hz three-phase alternating current with a voltage of 27,000 V and a current of 35,000 amperes. Unlike Unit 1, no dedicated traction current generation takes place, but some of the power produced is converted at the traction current substation. This is transmitted through the 380 kV generator transformer block of the II and the 380 kV-machine transformer of the motor-generator sets.