NiSource's Microsoft Deal Adds 1.1 GW Without Shifting Costs to Ratepayers

NiSource has signed one of the clearest examples yet of how utilities can serve power-hungry data centers without asking existing customers to finance the expansion. Microsoft agreed to fund the generation and transmission infrastructure needed for roughly 1,100 megawatts of new capacity at its northwest Indiana campus.

Service is expected to begin in 2028 under a 20-year agreement executed through NiSource Generation Company, or GenCo. The structure matters as much as the scale. NiSource says large-load customers will bear the incremental infrastructure costs and will also pay for their use of the existing Northern Indiana Public Service Company system.

The company now estimates that its data center contracts will generate about $1.75 billion of savings for existing NIPSCO electric customers over the life of the agreements, up from a previous estimate of $1.4 billion. NiSource says that could equal as much as $140 per customer annually, although the figure is a projection across the contract portfolio rather than a guaranteed bill reduction for every household.

A 600 MW battery commitment adds flexibility

GenCo has also contracted 600 MW of battery storage under a long-term tolling agreement with an AGP Group affiliate. The disclosure specifies power capacity but not storage duration, so it does not reveal the system's total energy capacity in megawatt-hours. That missing detail limits conclusions about how long the batteries could support peak demand.

For investors, the agreement expands NiSource's contracted large-load opportunity while reducing the most obvious regulatory concern: who pays for the grid buildout. The company has not yet disclosed total capital spending, the mix of generation resources or the contract's expected contribution to earnings and cash flow.

Those gaps make NiSource's October 28 third-quarter update the next important checkpoint. The commercial framework is attractive because Microsoft funds the assets and existing customers are promised a share of the economic benefit. The remaining question is whether the return profile and construction schedule justify the execution risk attached to a project of this size.