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In this May 12, 2014 photo, a worker puts additives into a furnace at Rochester Metal Products Corp. in Rochester, Ind. The hulking induction furnaces the plant uses to melt scrap iron consume enough electricity to power 7,000 households. (AP Photo/AJ Mast)

In this May 12, 2014 photo, a worker puts additives into a furnace at Rochester Metal Products Corp. in Rochester, Ind. The hulking induction furnaces the plant uses to melt scrap iron consume enough electricity to power 7,000 households. (AP Photo/AJ Mast)

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