Why is NiSource stock rallying today?

NiSource stock experienced a 2.8% rally during mid-day trading due to the announcement of a 20-year energy agreement with Microsoft for supplying approximately 1,100 MW of new generation capacity to the tech giant's northwest Indiana data center campus, with services set to begin in 2028. Executed through NiSource's generation subsidiary GenCo, this deal marks one of the largest utility-hyperscaler power commitments in NiSource's history.

Microsoft will fund all generation and transmission infrastructure required for powering the facility, ensuring existing NIPSCO residential and business customers do not bear the incremental costs. This arrangement is projected to generate approximately $1.75 billion in savings for existing NIPSCO electric customers over the life of the data center contracts, up from the previously announced $1.4 billion, which could translate to as much as $140 per customer annually.

The deal also incorporates a 600 MW battery storage component contracted through AGP Group, further enhancing grid reliability. This announcement occurred before NiSource's third-quarter 2026 earnings release scheduled for October 28, which will provide further financial and operational details on the data center strategy. Despite the broader market declining with the S&P 500 slipping 0.6% and the NASDAQ dropping 1.3%, NiSource's move is entirely company-specific, and investors view the combination of attracting large-scale industrial load while insulating its existing rate base favorably, driving shares toward the session high of $42.45.