Google launches Minnesota data hub with world’s largest battery, keeping power costs flat

Google’s Pine Island campus will be powered by a 1,900‑megawatt clean‑energy package that the company is financing directly with Xcel Energy, according to a CNBC report. The bundle includes 1,400 MW of wind and 200 MW of solar, plus a 300‑MW, 30‑GWh iron‑air battery from Form Energy that can store power for up to 100 hours—making it the largest long‑duration battery ever announced (Fast Company). By shouldering the cost of the new generation assets, Google says the arrangement will keep electricity rates flat for existing Xcel customers, a claim the utility echoed in its statement to Fast Company.

The battery’s chemistry is a departure from the lithium‑ion packs that dominate today’s data‑center back‑ups. Form Energy describes its system as “reversibly rusting iron,” a process that lets the device discharge slowly over days rather than the minutes‑to‑hours window typical of conventional storage (Fast Company). Xcel highlighted the strategic value of that duration, noting that Minnesota’s winter can bring several consecutive days of low wind and cloud cover, a scenario where a 100‑hour buffer can keep the grid stable without resorting to fossil‑fuel peakers (Fast Company). The 30 GWh capacity dwarfs the total U.S. battery installations slated for 2024, underscoring the scale of the experiment (Fast Company).

Google’s approach mirrors a previous venture in Nevada, where the firm funded a geothermal plant from Fervo to avoid adding expensive, intermittent capacity to the grid (Fast Company). In Minnesota, the company is essentially buying the right to clean power and then gifting that capacity to the broader system, a model that analysts have called “grid‑as‑a‑service.” Reuters confirmed that Xcel signed separate power‑purchase agreements with both Google and AES, the latter providing additional renewable generation to meet the data‑center’s demand (Reuters). The dual‑supply structure ensures that the data center’s load is covered while excess generation can be dispatched to the grid during peak periods.

Industry observers see the Pine Island project as a template for how hyperscale operators can decouple growth from carbon emissions. The long‑duration battery, in particular, addresses a known limitation of wind and solar—intermittency that stretches beyond a single day. Fast Company quoted Google’s Lucia Tian, head of advanced energy technologies, saying that investing in “systems that make our communities more resilient is table stakes” for the company (Fast Company). If the battery performs as projected, it could prove cost‑competitive with natural‑gas peaker plants, offering a cleaner alternative for utilities facing seasonal shortfalls (Fast Company).

The rollout also arrives at a moment when tech CEOs are converging on the White House to pledge greater self‑sufficiency in energy (Fast Company). Google’s Minnesota hub therefore serves as a concrete proof point that corporate‑scale clean‑energy procurement can be bundled with innovative storage, delivering both corporate resilience and public‑grid benefits without shifting costs onto ratepayers. Whether the model scales to other regions will depend on regulatory alignment and the economics of long‑duration storage, but the Pine Island data center has already set a new benchmark for the industry.