Manufacturing News
April 30, 2026
April 30, 2026 · Statewide · Story 1 of 3
Indiana's Generation Mix and Mammoth Solar: What's Actually Being Built
Indiana's 2024 mix ran roughly 42% coal, 36% natural gas, 9% wind, and 6% solar. Industrial load accounts for about 43% of total in-state electricity consumption, this is an industrial grid first, and that matters when costs shift.
On the solar side, Doral's Mammoth Solar project in Pulaski and Stark counties is one of the clearest examples of new capacity coming online. The project is 1,600 MW total. The first 480 MW came online in July 2024. Phases two and three, about 900 MW combined, are financed at roughly $1.5 billion and are under construction now, with completion targeting late 2026 or early 2027.
At the same time, NIPSCO is retiring its coal units at Schaeffer between 2026 and 2028 and replacing them, through a new subsidiary called NIPSCO GenCo, with 2,300 MW of new natural gas generation and 400 MW of battery storage. The load driver is Amazon data centers in northern Indiana. NIPSCO's planning documents show that once those data centers are counted, the utility's energy needs more than double. Every dollar of that infrastructure investment goes into the rate base. Rate base is where utility earnings come from. You pay for it.
For your morning huddle
- Q
How will NIPSCO's 2,300 MW natural gas build for Amazon data centers affect long-term electricity costs for Indiana manufacturers?
Every dollar NIPSCO invests through GenCo goes into its rate base and gets recovered from ratepayers over time through future rates. Manufacturers in NIPSCO territory should use conservative rate increase assumptions, not flat ones, in any three-to-five-year energy cost forecast.
From the brief, April 30, 2026
- Indiana's Generation Mix and Mammoth Solar: What's Actually Being Built
- Duke Energy Indiana's $103 Billion Capital Plan Is Already in Your Bills
- DOE Emergency Orders Are Keeping Aging Coal Plants Online, and the Costs Are Landing Somewhere
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