This week, the abstract challenge of powering the digital economy with clean energy took a concrete, massive step forward. A landmark deal between utility Xcel Energy, Google, and startup Form Energy will deploy a 30 GWh iron-air battery system to help power a data center in Minnesota. This isn’t just another large battery project; it represents the commercial-scale arrival of a new class of long-duration energy storage (LDES) technology aimed squarely at one of the grid’s most pressing problems: the voracious, 24/7 electricity demand of data centers. While the U.S. installed a record 58 GWh of energy storage in 2025, the vast majority has been lithium-ion systems providing 2-4 hours of duration, insufficient for bridging multi-day gaps in renewable generation.

Form Energy’s iron-air chemistry, which essentially “rusts” and “un-rusts” iron pellets to store and discharge electricity, promises over 100 hours of storage capacity at a capital cost projected to be significantly lower than lithium-ion alternatives for long-duration applications. This technological leap provides a potential pathway for utilities and large energy consumers like Google to achieve true 24/7 carbon-free energy, moving beyond the limitations of hourly renewable energy credits. The project serves as a powerful counter-narrative to the idea that meeting new, massive loads from data centers and electrification necessitates a new “dash to gas.” This alternative path is also gaining momentum, evidenced by the Department of Energy’s historic $26.5 billion loan to Southern Company, which will fund grid upgrades and 5 GW of new natural gas generation.

The financial and strategic implications are profound. For tech giants, this model offers a way to directly fund innovative grid infrastructure that solves their unique power needs, ensuring ratepayer costs are managed. For utilities, it presents a non-combustion alternative for maintaining reliability as baseload fossil fuel plants retire. As discussed at the recent Energy Storage Summit, the sector has been grappling with revenue certainty for LDES projects. A major offtake agreement with a credit-worthy entity like Google provides a bankable model that could de-risk investment in other nascent LDES technologies, from thermal storage to compressed air.

This Minnesota project will be a critical test case. Its performance and economics will be scrutinized by grid operators, regulators, and investors globally. If successful, it could catalyze a major shift in grid planning, moving the industry’s focus from short-duration energy shifting to multi-day reliability, and proving that novel battery chemistries are ready to play a foundational role in the future power system. For more information on energy system modeling, check out the resources from the National Renewable Energy Laboratory (NREL) or learn about global trends from the International Energy Agency (IEA).

This Week’s Top 5 Energy News Items

1. Google: Minnesota data centre energy deal includes 30GWh ‘multi-day’ iron-air batteries from Form Energy
2. DOE loans Southern $26.5B for 5 GW of new gas, other grid investments
3. New U.S. electric generating capacity expected to reach a record high in 2026
4. Ohio gas mega-plant tops first projects under U.S.-Japan $550B investment pledge
5. House passes bills to weaken DOE’s appliance efficiency program, repeal home rebates

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