Stock Photo - Detroit, Michigan - Contractors for DTE Energy replace old cast iron and bare steel natural gas pipes. The utility is in the midst of a 25-year plan to upgrade its underground infrastructure. Some of the pipes to be replaced were laid before 1900.

Stock Photo: Detroit, Michigan - Contractors for DTE Energy replace old cast iron and bare steel natural gas pipes. The utility is in the midst of a 25-year plan to upgrade.

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