Gravel PitSubstation and Transmission Line Upgrades

Indiana Michigan Power (I&M) is enhancing the power grid in northern Indiana. Gravel Pit Substation and Transmission Line Upgrades is essential to improve reliability for the region.

The improvements include upgrading the Gravel Pit Substation from 34.5 kilovolts (kV) to 138 kV. In addition to the substation work, approximately 6 miles of two new 138-kV transmission lines are being constructed to reconfigure how the substation is tied into the electric grid.

The approximately $20 million investment is essential to reduce power outages in the region and speed recovery of service when outages occur. Constructing two new lines and converting to a looped service improves reliability by ensuring if an outage occurs on one line, the other line can still provide power to the substation.

Project Updates

Spring 2017: I&M announced the final line route for the Gravel Pit Substation and Transmission Line Upgrades. The announcement follows an open house held in January, which provided information about the project and provided property owners with the opportunity to ask questions and provide input. Details around the final line route can be viewed on the interactive map above.

Project Releases

I&M Announces Final Line Route of Gravel Pit Transmission Line Upgrades, March 29, 2017 (PDF)

I&M Announces major improvements to South Bend News Release, January 9, 2017 (PDF)


Project Timeline



I&M will construct steel monopole structures ranging between 90 and 110 feet in height. The structures will be placed in the center of a 100-foot-wide right-of-way corridor.

I&M is committed to meeting the energy needs of customers while protecting the environment and natural beauty of the region.

* Exact structure, height and right-of-way may vary


Project Fact Sheet Access Roads Field Activities

Indiana Michigan Power serves 575,000 customers in Indiana and Michigan.

I&M Outreach Team

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