Fuel Cells for Data Center Power: How They Work and Where They Fit

A fuel cell produces electricity through an electrochemical reaction rather than by burning fuel to spin a generator. In a solid oxide fuel cell, a ceramic electrolyte carries oxygen ions that react with hydrogen and carbon monoxide reformed from natural gas inside the unit. The output is direct current, which inverters convert to AC for the facility. The U.S. Department of Energy’s fuel cell office has examined this pairing directly, holding a 2019 workshop on hydrogen and fuel cells for data centers at which presenters examined fuel cells as primary on-site power.⁸

Most of the capacity being sold for data centers today is solid oxide. Bloom Energy’s Energy Server, the most widely deployed product in this segment, is sold in blocks of roughly 325 kW and scales to hundreds of megawatts by adding units side by side or stacking them.² Other chemistries exist (molten carbonate, phosphoric acid and proton exchange membrane units), but SOFCs dominate the large-load announcements of 2024–2026.¹³

• Fuel: pipeline natural gas in almost every current data center project; biogas and hydrogen are possible in some products.²
• Efficiency: Bloom cites about 54% lifetime electrical efficiency, and more than 90% combined efficiency when waste heat is captured.²
• Operation: no combustion, few moving parts and no water consumption in normal operation, which matters in water-stressed sites.⁴

The driver is time to power. In many markets a large load waits years for transmission upgrades. AEP, for example, told Ohio regulators it could take 7 to 10 years for transmission to meet full demand in central Ohio, and it proposed on-site fuel cells to let data centers start operating in the meantime.⁹ Our guide to power timelines and interconnection queues explains why those waits arise.

Fuel cells answer that gap in three ways. They are modular, so capacity can be added as the ramp schedule grows. They are dense: Bloom says its deployments reach about 100 MW per acre, a vendor figure that implies a small footprint for the output.¹ And they can be installed quickly once gas and equipment are on hand; Bloom and Oracle said in announcing their 2025 agreement that Bloom would provide onsite power for an entire data center within 90 days.⁴

Fuel cells can serve as bridge power until a grid connection arrives, as a permanent behind-the-meter source, or as a utility-owned asset on the customer’s site. The last model is new and worth understanding, because it changes who carries the cost and the regulatory approvals.

The market changed quickly between late 2024 and early 2026. The deals below are public and well reported; they show the range of ownership models.

The Ohio case is a useful template. AEP Ohio owns the fuel cells, the data center customers pay for them under long-term contracts, and the application stated that other ratepayers would not pay for the system.⁹ The Wyoming project, by contrast, sits in an unregulated AEP subsidiary that sells all of the output to a single investment-grade customer under a 20-year agreement.¹¹ For a landowner, these are two different counterparties with different approval paths.

A fuel cell plant is only as reliable as its gas supply. A data center running on fuel cells as its primary source needs gas around the clock, so the buyer will look for firm transportation and a dedicated lateral sized for the full build, not interruptible service from a local distribution main. Our guides to natural gas pipeline access and firm gas transportation cover how to judge that.

New pipe can be the long pole. For AEP’s central Ohio fuel cell project, a gas utility agreed to build, own and operate a new pipeline to the site, with service targeted for October 2026 when the deal was announced in August 2025.⁷ That is a gas lateral project with its own easements and approvals, separate from the electric side.

• Land: fuel cells are compact, but the site still needs room for gas metering, inverters, switchgear, access roads and maintenance clearances.
• Layout: modules are typically placed outdoors on pads near the electrical yard. Stacking options reduce footprint further.²
• Maintenance: stacks degrade over time and are replaced on a schedule, so access for heavy equipment matters for the life of the plant.
• Grid tie: many designs keep a utility connection for backup or eventual transition; confirm the utility’s rules for parallel operation early.

Because there is no combustion, fuel cells emit very little nitrogen oxide, carbon monoxide or particulate matter. California’s Air Resources Board certifies qualifying units under its Distributed Generation Certification Program, which state law exempts from local air district permit requirements; Bloom’s 325 kW natural gas ES-6.5 unit was certified in 2024 under Executive Order DG-058, with NOx limited to 0.07 lb per MWh.⁵ Certification is not itself a permit, and the owner still has to meet other applicable rules. Other states treat fuel cells differently, so confirm with the state air agency whether a permit, registration or exemption applies. Our guide to air permits for data center generators covers the combustion alternatives.

Carbon dioxide is another matter. A natural gas fuel cell oxidizes the carbon in the fuel, so CO2 output follows efficiency. Bloom publishes emission rates of 679–833 pounds of CO2 per MWh for its natural gas units, against its own reference figures of about 970 pounds for an average gas plant and 2,260 pounds for an average coal plant.⁶ That is a meaningful reduction from the average fleet, but it is in the range of modern combined-cycle gas generation, not near zero.

Fuel cells generally cost more per MWh than grid power in markets with ample capacity, and their economics depend heavily on gas price, financing structure and incentives. The case for them is speed and certainty, not cheapness. Bloom has positioned its partnerships around this: the Brookfield deal is explicitly about on-site, behind-the-meter power for AI facilities facing grid congestion.³ In announcing it, Bloom claimed capital costs on par with gas turbines and 15–20% lower fuel use; treat those as vendor figures to test against quotes. The same coverage noted that hydrogen remains too costly for most deployments, so nearly all units run on natural gas, and that an Amazon contract for Bloom fuel cells at three Oregon data centers had been cancelled the year before.³ Deals can change, so diligence should cover the counterparty and the contract, not just the technology.

The comparison with engines and turbines is covered in more depth in our guide to gas turbines vs. reciprocating engines, and the broader choice in grid power vs. on-site generation. Fuel cells are rarely the only answer on a large campus; many designs pair them with batteries, engines or a later grid connection.

1. 01Confirm gas: which pipeline or distribution utility can deliver firm volume to the site, at what pressure, and how long a new lateral would take.
2. 02Ask the electric utility how it treats on-site generation: parallel operation, standby charges, and whether it offers a utility-owned model like AEP Ohio’s.
3. 03Check the state air rules for fuel cells, and whether local zoning treats a fuel cell plant as an accessory use or a power plant.
4. 04Reserve land for pads, metering, inverters and future expansion, and keep heavy-equipment access to every row.
5. 05Plan the end state: whether fuel cells remain primary, become backup, or are replaced by a grid connection once transmission arrives.

A site with strong gas and weak near-term electric capacity is exactly where fuel cells help. If you want an outside view of both, you can get a site reviewed.