NiSource's Answer to the Data Center Backlash: Make Microsoft Pay for the Grid It Needs
NiSource announced on October 16 that its Indiana utility, NIPSCO, has signed a 20-year energy agreement with Microsoft to supply a planned data center campus in La Porte, in the northwest corner of the state. The deal adds roughly 1,100 MW of new generation to the portfolio of NiSource Generation Company LLC, the subsidiary built specifically to serve large industrial and data center loads, with Microsoft expected to start drawing power in 2028.
Buried in the generation figure is a second number that matters more to regulators: 600 MW of battery storage, contracted under a long-term tolling agreement with a facility to be built by an affiliate of AGP Group. The batteries join GenCo's pooled assets, which are shared across NIPSCO's large-load customers rather than dedicated to Microsoft alone — a design choice that lets the utility spread capital risk across a growing roster of big industrial tenants instead of betting the balance sheet on one hyperscaler's build-out.
Who actually pays for the gigawatt
NiSource's pitch is specifically about cost allocation, the fight now consuming state commissions and RTOs from Virginia to Ohio to PJM's footprint. The company says the new agreement raises its projected savings for existing NIPSCO electric customers from a previously disclosed $1.4 billion to about $1.75 billion over the life of the contracts, or up to $140 per customer per year. The mechanism: large-load customers like Microsoft fund the generation, storage and transmission upgrades built to serve them, and that infrastructure then adds capacity to a shared pool that lowers costs for everyone else, rather than being billed back through general rates.
Affordability is not separate from economic development; it is a key pillar of our GenCo model. — Lloyd Yates, President and CEO, NiSource
Microsoft's side of the quote is just as pointed. Jeff Riles, the company's senior director of energy markets, said Microsoft has "always been committed to paying our own way" and framed the deal as supporting grid reliability rather than straining it. That language is a direct answer to the complaint utilities and ratepayer advocates have been making all year: that hyperscale data centers socialize their power costs onto households and small businesses.
A template built for a hostile political moment
The timing is not incidental. A Virginia state senator proposed a three-year statewide data center moratorium on October 15. Ohio's Supreme Court is weighing a challenge to AEP's data center tariff. And FERC has spent the fall rejecting and reworking RTO proposals for how large loads get curtailed and billed during grid stress. Against that backdrop, NiSource is trying to show regulators and the public a version of hyperscale buildout where the math is explicit and the ratepayer is better off, not worse — full-cost recovery from the load that caused the spending, plus a shared-asset structure that turns a single customer's infrastructure into system-wide capacity.
Whether that holds up depends on details NiSource hasn't released yet, including the specific large-load rate class terms, the battery system's duration and megawatt-hour capacity, and how NIPSCO will treat Microsoft's load if the campus ramps up unevenly. NiSource says more will come on its third-quarter earnings call on October 28. The La Porte campus itself is already one of Microsoft's largest Midwest commitments — building on a 2024 announcement of over $1 billion for a 489-acre site at Radius Industrial Park, expanded in April 2026 to as many as 17 buildings — with Microsoft separately holding 939 acres in nearby Mishawaka that could see a similar deal follow.
For supply-chain vendors watching where the next gigawatt of demand lands, the GenCo structure is worth tracking less for this one contract than as a model other regulated utilities may copy: battery storage and gas or renewable generation procured specifically against a hyperscaler's signature, pooled rather than siloed, and marketed to regulators as a rate cut rather than a rate risk.