Portions of the electric transmission grid in Michigan were built more than 50 years ago and have experienced minimal investment since that time. The Marshall-Blackstone 138,000 volt (138kV) transmission line has become increasingly unreliable and costly to maintain as growing demand for electricity and outdated infrastructure technology have taxed its service capabilities and created the potential for the line to become overloaded. The line’s aged steel structures are exhibiting deterioration and obsolete conductors (wires) need to be replaced. Rebuilding the line with a higher capacity conductor will provide greater reliability in the southern region of the state. The work began in the third quarter of 2015 and was completed in the fourth quarter of 2016.
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