IN Brief:
- Google and Xcel Energy have agreed a package that includes a 300 MW, 30 GWh Form Energy iron-air battery in Minnesota.
- The wider deal adds 1,400 MW of wind, 200 MW of solar, and funding for distributed battery support through Xcel’s Capacity*Connect programme.
- The structure links new hyperscale electricity demand to grid-side generation, storage, and infrastructure funding rather than relying on offset procurement alone.
Google and Xcel Energy have agreed a power package for a new Google data centre in Pine Island, Minnesota that includes what the companies describe as the largest battery project by energy capacity yet announced globally — a 300 MW, 30 GWh iron-air system from Form Energy.
The storage project is only part of the arrangement. Under the Clean Energy Accelerator Charge structure agreed between the two companies, Xcel’s Upper Midwest grid would also gain 1,400 MW of new wind capacity, 200 MW of new solar, and a further $50 million contribution from Google into Xcel Energy’s Capacity*Connect programme, which is designed to place smaller batteries across the utility’s system to strengthen reliability.
What makes the deal significant is the duration of the storage. Form’s system is configured for 100 hours, which shifts the conversation from conventional battery arbitrage into multi-day grid support. Instead of simply moving solar generation from midday into the evening peak, this type of asset is intended to hold energy through longer weather events and lower-renewables periods, then discharge when system conditions tighten over several days.
That is why the project stands out in the context of data centre growth. Large new loads are arriving faster than utilities can comfortably absorb them through traditional planning cycles, and the clean power response is often framed in terms of annual energy matching or off-site procurement. This agreement is more system-oriented. Google will cover the costs associated with its electric service and any new grid infrastructure tied to the project, while the resource package is being built directly into Xcel’s network.
Xcel said the new clean energy resources would help move the utility beyond its current 70% carbon-free electricity mix. Google, meanwhile, is using the Minnesota site to push a model it has already been developing in other US markets: pair new load with new clean generation, then add storage and network support so that reliability does not simply get handed back to the rest of the grid.
The agreement still requires review by the Minnesota Public Utilities Commission, and that approval step matters because this is not a routine tariff filing. It is a test of how regulators, utilities, and hyperscale customers manage the collision between surging digital demand and the slower physics of power infrastructure.
If approved, the Form installation will become a commercial reference point for iron-air chemistry at utility scale, and a far clearer signal that long-duration storage is moving from pilot status into grid planning.
