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In page William H. Zimmer Power Station:

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The construction of Zimmer was a consortium of CG&E, Columbus & Southern Ohio Electric, and DP&L. The project was announced in 1969 with a cost of $420 million to construct two 840 MW nuclear power units with completion dates set for 1975 and 1976.[1] The plant is named after William H. Zimmer, who was chairman and president of CG&E from 1962 to 1975.[1][2] Construction of the plant did not start until 1972 because the Atomic Energy Commission (AEC) demanded stricter standards to approve of nuclear plants.[3] The second proposed unit was upgraded from 840 MW to 1,170 MW in 1974. General Electric's BWRs were chosen for the plant's nuclear reactors.[4] Ultimately, the second unit was never constructed due to regulatory issues and costs.[5]