Energy Mix in Transition

As the nation moves toward increasing use of renewable energy, I&M is proud that more than 60% of the energy generated in 2016 came from emission-free sources. Our Building the Future plan emphasizes our commitment to greener energy.

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  • I&M continues to invest in its emission-free Cook Nuclear Plant through the $1.2 billion life-cycle management project. In addition, government mandates require I&M to make upgrades and modifications at Cook in response to the Fukushima incident in Japan; make additional investments in cyber security; conduct new inspections of more than 1,600 pieces of key hardware in the plant; and make technical adjustments to ensure the reliable availability of a consistent flow of off-site power.
  • I&M is becoming a regional leader in developing solar power plants. I&M now has four solar generation plants and plans to build more.
    The Deer Creek Solar Facility in Marion is I&M’s first solar generation plant, generating up to 2.5 megawatts of energy and capable of powering 350 homes every year.
    The Twin Branch Solar Facility near Mishawaka generates up to 2.6 megawatts of energy and capable of powering more than 360 homes every year.
    The Olive Solar Facility west of South Bend is I&M’s largest solar generation plant, generating up to 5 megawatts of energy and capable of powering 700 homes every year.
  • I&M’s Building the Future plan will create a new renewable energy option that empowers customers to attribute a portion of their energy usage – 10 percent, 20 percent, 30 percent … up to 100 percent -- to solar and wind generation at a level the customer chooses.
  • I&M is transitioning to more diverse energy sources in a smart way designed to maintain reliable generation. In 2015, I&M closed one of its two remaining coal-fueled plants. I&M is adding more emission-control technology to its remaining plant at Rockport, which is still needed to ensure residential, commercial and industrial customers have the energy they require 24/7/365.
  • At the same time, I&M must plan for a future with less reliance on coal generation. The most prudent move is to adjust depreciation costs for Rockport. Delaying the adjustment could drive those costs higher on an annual basis.

Our Energy Mix

6 Hydro plants

Berrien Springs, MI

Buchanan, MI

Constantine, MI

Elkhart, IN

Mottville, MI

Twin Branch, IN

Total Capacity

22.4 MW

4 Solar plants

Deer Creek Plant (Marion)

2.5 MW

Olive Plant (New Carlisle)

5.0 MW

Twin Branch (Mishawaka)

2.6 MW

Watervliet, Mich.

4.6 MW

3 Wind plants

Fowler Ridge

150 MW


100 MW


200 MW

1 Coal plant

Rockport Plant

2600 MW

1 Nuclear plant

Cook Plant

2278 MW

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