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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)

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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)

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In this May 12, 2014 photo, molten metal pours out of 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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In this May 12, 2014 photo, molten metal is cast 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)