NiSource announced on 16 October 2026 a long-term energy agreement with Microsoft for Microsoft’s previously announced northwest Indiana campus. Through NiSource Generation Company (GenCo), NiSource says it will add approximately 1,100 MW of new generation resources under a 20-year agreement beginning in 2028.
The release is full of forward-looking statements. NiSource’s own risk language flags regulatory approvals among factors that could change outcomes. Treat megawatts, savings and start dates as announced plans, not energised capacity.
What the deal structures
Under the agreement, Microsoft is expected to begin taking electric service under a 20-year term starting in 2028. The GenCo-owned pool portfolio will increase by approximately 1,100 MW, with NIPSCO and GenCo providing transmission and generation infrastructure. Microsoft fully funds all generation and transmission required to serve its load, NiSource says — the GenCo model is designed so large-load customers fund the assets needed for their demand and existing NIPSCO electric customers are protected from incremental costs.
Important wording: 1,100 MW is new generation added to the GenCo pool to help serve Microsoft’s data centre and NIPSCO customers. NiSource does not state that figure as Microsoft’s campus load, and the release does not disclose a fuel mix for the new resources.
Battery storage alongside the deal
In connection with the Microsoft agreement, GenCo has contracted 600 MW of battery storage under a long-term tolling agreement. The facility will be developed and constructed by an affiliate of AGP Group, and added to GenCo’s pool resources designed to serve multiple large-load customers.
Customer savings — NiSource estimates
NiSource says the agreement builds on previously disclosed $1.4 billion expected customer savings over the life of data-centre customer contracts, increasing total expected NIPSCO electric customer savings to approximately $1.75 billion, equating to as much as $140 per customer annually. Those are NiSource estimates, not independent forecasts.
Lloyd Yates, NiSource president and CEO, said: “Affordability is not separate from economic development; it is a key pillar of our GenCo model.” Jeff Riles, Microsoft senior director of energy markets, said Microsoft is “committed to paying our own way… to ensure that our data centers don’t increase electricity prices for other ratepayers.”
More detail later; approvals still ahead
NiSource says further operational and financial details will come on its third-quarter earnings call. Until regulators approve the arrangements and assets are built and placed in service, the accurate status is a signed long-term agreement with pending approvals and construction risk — not power already flowing to the campus.
Why it matters
Hyperscale campuses live or die on who pays for new generation and transmission. NiSource’s GenCo framing — Microsoft funds its load; existing ratepayers share estimated savings — is the same political economy TSN tracked in Who Pays for AI’s Power?, which covered Duke’s data-centre settlement and Google in Indiana. Today’s item is a separate NiSource–Microsoft structure in northwest Indiana, not an update to those earlier deals.
Battery storage in the pool also matters: 600 MW of contracted storage is a flexibility hedge while fuel mix for the ~1,100 MW of new generation remains undisclosed.
What’s still unknown
- Fuel mix and technology for the ~1,100 MW
- Exact campus load versus pool capacity
- Timing and conditions of regulatory approvals
- How the $1.75bn / $140-per-customer savings estimates were calculated
What to watch
- Q3 earnings-call detail from NiSource
- Indiana regulatory filings on the Microsoft / GenCo arrangements
- Construction milestones for generation, transmission and the AGP-linked battery project
What this means
- ~1,100 MW new generation under a 20-year NiSource–Microsoft deal from 2028 (NiSource).
- Microsoft fully funds generation and transmission for its load; 600 MW battery storage contracted (tolling; AGP affiliate builds).
- Savings rise to ~$1.75bn / as much as $140 per customer annually — NiSource estimates.
- Regulatory approvals pending; no fuel mix stated.
Sources
Related stories
Follow @tsnmediahub on X for breaking AI news as it happens.
Follow on X
