LAKE TOWNSHIP, Mich. (AP) -- Officials say a reactor at the Donald C. Cook Nuclear Plant in southwestern Michigan has been returned to service following a refueling outage that began in March.

The Herald-Palladium of St. Joseph reports ( http://bit.ly/Im6DqP ) the outage included installation of new transformers in addition to refueling the Unit 2 reactor, regular maintenance and testing. During the outage, about 1,000 contract workers supplemented the plant's regular 1,100-person staff.

The reactor returned to service on Saturday.

The plant is located in Berrien County's Lake Township. It's run by Indiana Michigan Power, a subsidiary of Columbus, Ohio-based American Electric Power Co.

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Information from: The Herald-Palladium, http://www.heraldpalladium.com