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MONROE CO. -- The Fermi 2 nuclear power plant in Monroe County has been shut down.

DTE Energy says it took the plant offline after finding an excess of hydrogen gas in a cooling center for the main electrical generator.

An increase in hydrogen gas in the water-cooled system decreases its efficiency.

The generator is on the non-nuclear side of the plant and has two separate cooling systems for its different sections.   One uses water and the other hydrogen.