Debates about hydrogen energy tend to operate at high altitude — future grids, decarbonized heavy industry, aviation fuel, zero-emission shipping lanes. The GAO’s April 2026 technology assessment is more grounded. It documents where hydrogen energy technology is actually working at commercial scale today, and the answer is narrower than the promotional literature suggests but more substantive than skeptics typically acknowledge.
Forklifts: The Clearest Success Story
Hydrogen fuel cell forklifts are the largest single deployment of hydrogen energy technology in the United States. As of 2023, more than 60,000 hydrogen-powered forklifts were in operation — approximately 16 percent of all forklifts used nationwide. By 2024, that number had grown to more than 70,000.
The economics work here for specific reasons. Warehouses and distribution centers operating multiple shifts cannot afford the downtime required to recharge battery-electric forklifts. Hydrogen forklifts refuel in approximately three minutes. They maintain consistent power output throughout the operating cycle, unlike batteries that degrade in performance as charge depletes. They produce no harmful emissions at the point of use — only water vapor and warm air — which eliminates the ventilation infrastructure costs that internal combustion forklifts require in enclosed environments.
The Department of Energy supported early deployment through the American Recovery and Reinvestment Act of 2009, investing roughly $9.7 million alongside $11.8 million in industry cost share for an initial deployment of 713 fuel cell forklifts. The market grew independently from there. By 2022, DOE-supported units represented less than 2 percent of deployed hydrogen forklifts — a signal that the technology achieved commercial self-sufficiency in this application.
Backup Power and Generators
Hydrogen fuel cell generators are an established commercial product in applications requiring quiet operation, zero on-site emissions, and reliable power. Hospitals, construction sites in noise-sensitive environments, and increasingly data centers are the primary customer base.
The data center connection is significant. The rapid expansion of AI and cloud infrastructure has created an acute near-term problem: data centers need large amounts of backup power, but diesel generators create emissions and noise that conflict with local regulations in many jurisdictions. Permitting new grid connections can take years. Hydrogen fuel cell backup systems offer an alternative that some operators are actively pursuing, with the GAO report citing industry stakeholders who are currently deploying cryo-compressed hydrogen systems for onsite power generation at data center facilities.
The same operational logic applies in the oil and gas sector. Companies operating drilling rigs in Colorado have expressed interest in hydrogen alternatives to diesel generators due to local air quality concerns and health impact regulations. The transition from diesel to hydrogen in this context is not ideologically motivated — it is regulatory compliance by the lowest-cost available path.
Heavy-Duty Buses and Trucks
Hydrogen fuel cell buses are operating in transit agency fleets in the United States. Officials from one transit agency interviewed by GAO reported that their hydrogen buses experience fewer weather-related performance issues than battery-electric alternatives, have lower operating costs, and have allowed the agency to expand its low-emission fleet beyond what battery technology alone would support.
The core operational advantages over battery-electric in heavy-duty applications are range and refueling time. A hydrogen fuel cell bus can be refueled in a comparable time to a diesel bus. A battery-electric bus of equivalent range requires significantly longer charging, creates depot scheduling constraints, and imposes a heavier weight penalty that reduces payload capacity. For transit agencies operating long routes or high-frequency schedules, those factors matter.
Heavy-duty trucking presents a similar calculus. Long-haul trucks require range, fast refueling, and maximum payload. Battery weight in long-range electric trucks consumes payload capacity. Hydrogen’s higher energy-to-weight ratio addresses that constraint, though the absence of a nationwide hydrogen truck refueling network remains a significant deployment barrier.
Where Light-Duty Vehicles Failed
Light-duty hydrogen fuel cell vehicles present a contrasting case study. Global sales peaked at 16,000 units in 2021 and fell to 5,000 in 2024. Battery electric vehicles grew from 17,000 on the road globally in 2010 to 7.2 million in 2019. The divergence is stark and largely infrastructure-driven.
Hydrogen refueling stations for passenger cars are scarce, prone to temporary closure, subject to supply disruptions, and often experience long wait times and equipment failures. Retail hydrogen prices rose in recent years. The combination of unreliable infrastructure, high fuel cost, and the continued improvement and expanding refueling network for battery-electric vehicles made the FCEV value proposition increasingly difficult to sustain in the passenger car segment. The GAO report treats this as a market outcome, not a technology failure.
The lesson is not that hydrogen vehicles do not work — it is that they require dedicated infrastructure that does not exist at the scale needed for consumer markets, and that battery technology improved faster and deployed more aggressively in the passenger vehicle segment. In heavy-duty applications where batteries face physical limitations, hydrogen remains competitive. In light-duty consumer applications where battery refueling infrastructure expanded rapidly, hydrogen did not build its network fast enough.