Why does Illinois have more nuclear reactors than other states?

due to contamination and facility degradation.

It is ture that Illinois leads the nation in nuclear power generation, producing almost 50 per sent of the state's electricity and about 1/8 of the nations nuclear power generation

As well as In 2019, Illinois generated the most electricity from nuclear energy, and the state's six nuclear plants accounted for 12% of U. S. nuclear power net generation