Report Highlights

Supercapacitors in the United States: Market Overview

The U.S. supercapacitor market was valued at USD 0.42 billion in 2024 and is forecast to reach USD 0.79 billion by 2032, a compound annual growth rate of 8.2 percent. Demand concentrates in transportation regenerative braking, grid frequency regulation, industrial uninterruptible power, and defense electronics. Domestic manufacturing is small, with most cells sourced from Japan, South Korea and China. That structure reflects decades of tariff-free import access and minimal federal production support before 2022, when the Inflation Reduction Act changed investment incentives.

Private firms have led product development, while government has dominated demand. The Department of Defense, through DARPA and ground-vehicle programmes, funded early high-power energy storage work, and the Department of Energy's Advanced Research Projects Agency-Energy supported electrode and electrolyte research. Commercial leadership sits with Eaton and Ioxus in the United States and with Panasonic and Murata abroad, whose product roadmaps determine what reaches American buyers.

Policy-Driven Growth in U.S. Supercapacitors

Three mechanisms drive demand. The Inflation Reduction Act of 2022 offers Section 48C advanced energy project credits worth 30 percent of qualifying manufacturing investment, drawn from a USD 10 billion allocation, lowering capital costs for new electrode and cell lines. The Bipartisan Infrastructure Law of 2021 funds the Federal Transit Administration's Low or No Emission Vehicle Program, which purchases regenerative-braking buses where ultracapacitor modules absorb peak power. Together these convert public capital into recurring component orders.

The third mechanism is sourcing compulsion. The FY2024 National Defense Authorization Act extended restrictions in DFARS 225.7018 on electrochemical energy storage from covered foreign entities, forcing Department of Defense buyers toward domestic or allied modules. Build America, Buy America under Division G of Public Law 117-58 applies domestic content thresholds to federally funded transit and grid projects, channelling procurement to American assembly lines.

Regulatory Barriers and Compliance Costs

Chemical and product compliance is the first barrier. Electrolyte salts and solvents such as tetraethylammonium tetrafluoroborate in acetonitrile must clear premanufacture notice review under Section 5 of the Toxic Substances Control Act, administered by the Environmental Protection Agency's Office of Pollution Prevention and Toxics, which allows 90 days for review and can extend through consent orders. Cells must also pass UL 810A testing through a Nationally Recognized Testing Laboratory recognised under OSHA's 29 CFR 1910.7, adding months and six-figure test budgets to each product family.

Trade and content rules form the second barrier. Section 301 duties apply to Chinese-origin capacitors under HTSUS heading 8532, enforced by U.S. Customs and Border Protection under the Office of the United States Trade Representative's lists. Buy America certifications require the Federal Transit Administration to verify domestic content before grant funds release, and importers must retain origin documentation for five years under 19 CFR 163, adding administrative cost to every shipment.

Policy-Created Opportunities in the United States

The Federal Transit Administration's Low or No Emission Vehicle Program creates a dependable order stream for ultracapacitor modules, because regenerative-braking bus fleets need high-cycle energy buffers that lithium-ion cannot sustain economically. Transit agencies receiving Low-No awards must document domestic content, giving qualified module suppliers preferred status before importers can compete. Suppliers certifying Buy America compliance first capture these contracts for multi-year delivery.

Defense procurement under Title III of the Defense Production Act, administered by the Department of Defense, funds domestic capacity in critical electronics components and opens multi-year offtake for U.S. supercapacitor makers. Section 48C credits from the Internal Revenue Service reward factories producing electrode carbon and cell assembly in the United States. The Department of Energy's Loan Programs Office, operating under Title XVII of the Energy Policy Act of 2005, can finance these plants at scale.

Market at a Glance

Leading Market Participants

• Eaton
• Ioxus
• Panasonic
• Murata Manufacturing
• Kyocera AVX
• Nichicon
• Skeleton Technologies
• CAP-XX
• Nippon Chemi-Con
• Maxwell Technologies

Regulatory and Policy Environment

The primary instruments are the Inflation Reduction Act of 2022 (Public Law 117-169), the Bipartisan Infrastructure Law (Public Law 117-58), and the FY2024 National Defense Authorization Act. The Internal Revenue Service administers Sections 45X and 48C, and the Federal Transit Administration enforces Buy America under 49 CFR Part 661. Key compliance requirements include TSCA premanufacture notices for electrolyte chemicals, UL 810A certification, HTSUS origin documentation, and DFARS supplier declarations. Upcoming changes include scheduled Section 301 increases on Chinese lithium-ion batteries from 1 January 2026, and the One Big Beautiful Bill Act (Public Law 119-21) of 2025, which tightened foreign-entity restrictions on 45X credits. Section 45X phase-down begins in 2030.

Compared with regional peers, the U.S. framework relies on tax credits and procurement rules rather than mandates. The EU Battery Regulation (EU) 2023/1542 imposes carbon footprint declarations and due diligence obligations, a more prescriptive model than American incentive design. China's 14th Five-Year Plan for new-type energy storage set a 30 GW target for 2025 through the National Energy Administration, supported by domestic cell subsidies. The U.S. approach delivers stronger buyer-side protection, but it trails China in scale.

Long-Term Policy Outlook for U.S. Supercapacitors

Between 2026 and 2032, the decisive policy variable is the continued tightening of foreign-entity rules. Tariff escalation under Section 301 and DFARS sourcing restrictions will progressively shift procurement toward domestic and allied producers, favouring firms with qualified U.S. assembly. Section 45X credits begin phasing down in 2030, so manufacturers must reach production volume before that date to capture full benefit.

Grid policy will become the larger growth driver after 2028. FERC Order 841 market access for storage will broaden frequency regulation revenue in PJM and CAISO, rewarding high-cycle devices. Defense and transit programmes will continue to set specifications, meaning that UL 810A and Buy America compliance will define competitive entry more than price.