The NiSource Microsoft agreement announced on October 16, 2026, calls for approximately 1,100 megawatts of additional generation resources, with Microsoft expected to begin receiving electricity in 2028 under a 20-year term. Microsoft will fully fund the generation and transmission needed to serve its northwest Indiana data center campus, under a structure intended to protect existing utility customers from those costs.
Key Takeaways
- Microsoft is expected to start taking electric service in 2028 under a 20-year agreement.
- NiSource expects total savings across its data center customer contracts to reach approximately $1.75 billion.
- A related 600 MW battery-storage agreement will support a shared pool serving multiple large-load customers.
Table of Contents
- NiSource Microsoft agreement expands the generation pool
- Customer savings depend on the funding structure
- Battery storage will serve more than one customer
- Conclusion
NiSource Microsoft agreement expands the generation pool
NiSource will serve Microsoft through NiSource Generation Company LLC, known as GenCo. Its generation portfolio is set to expand by approximately 1,100 MW, while GenCo and Northern Indiana Public Service Company, or NIPSCO, will provide the generation and transmission infrastructure.
NiSource’s long-term energy agreement announcement says the arrangement is designed to coordinate power supply for Microsoft’s campus and NIPSCO customers. The planned transmission upgrades are also intended to improve grid reliability and resilience in Indiana.
The announcement describes future service and infrastructure additions, not capacity already operating. The 2028 start remains an expectation.
| Item | Details |
|---|---|
| Previously expected customer savings | $1.4 billion over the life of data center customer contracts. |
| Updated expected customer savings | Approximately $1.75 billion across those contracts. |
| Estimated annual customer benefit | As much as $140 per NIPSCO electric customer, according to NiSource. |
Customer savings depend on the funding structure
Under the GenCo model, large-load customers fund the generation and infrastructure needed to meet their demand. NiSource says the structure also returns value to existing NIPSCO electric customers for use of the existing system.
The Microsoft agreement increases NiSource’s estimate of total customer savings over the life of its data center contracts. Those figures cover the broader contract portfolio, rather than savings attributable solely to Microsoft, and remain company expectations rather than benefits already delivered.
Battery storage will serve more than one customer
In connection with the Microsoft agreement, GenCo has contracted 600 MW of battery storage under a long-term tolling agreement. An affiliate of AGP Group will develop and construct the facility.
The battery resource will join GenCo’s pooled assets serving multiple large-load customers. It is therefore distinct from an exclusively dedicated Microsoft storage facility; the announcement does not say Microsoft alone funds the entire battery project.
Execution remains subject to risks including regulatory approvals, data center construction and the timely completion of generation and transmission assets. NiSource said further operational and financial details would be shared on its third-quarter earnings call.
Conclusion
NiSource’s next confirmed update is its third-quarter earnings call, when the company plans to provide additional operational and financial details on the agreement and its broader data center strategy.
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