New Carlisle-Bosserman Area Improvements Project

    Indiana Michigan Power (I&M) is building approximately 10 miles of 138-kilovolt (kV) transmission line, upgrading approximately 6 miles of transmission line from 34.5 kV to 138 kV, constructing a new Silver Lake Substation and retiring the existing Silver Lake Substation, and building the new Marquette Substation. The Springville Substation will be retired. The improvements in St. Joseph and La Porte counties are essential to ensure continued reliable electricity is available for customers across the region.

    The approximately $55 million investment improves reliability of the electric service by decreasing the possibility of power outages and speeding recovery of service when outages occur. Aging wood poles will be replaced with steel monopoles designed to expand the distance between poles to reduce impacts to landowners.

    Project Updates

    Early 2019: Construction on the New Carlisle-Bosserman Area Improvement Project began in Spring 2018 and is slated to finish late 2019 or early 2020. 

    Fall 2017: I&M announced the final proposed line route for the New Carlisle - Bosserman Area Improvements Project. The announcement follows an open house held in May, which provided information about the project and provided property owners with the opportunity to ask questions and provide input. Details around the final proposed line route can be viewed on the interactive map above.

    Project Releases

    Fact Sheet



    I&M will replace aging wood poles with steel monopole structures ranging between 80 and 90-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

    * The accompanying map depicts the project area. It should be noted that the map contained on this site is for information purposes only. AEP reserves the right to alter, change, or amend the map at any time without notice and AEP provides no warranty about the accuracy of content. Keep this in mind when reviewing this map. However, AEP will make all attempts to keep this map as accurate as possible. If you have any questions about the accuracy of the current map please Contact Us.