US clean energy policy hits strategic paradox: security restrictions collide with decarbonization timelines
Brookings analysis exposes how tariff escalation and capital restrictions on Chinese components simultaneously advance strategic autonomy and delay the energy transition the US claims to accelerate.
The United States has engineered a strategic collision: security-driven restrictions on Chinese clean energy capital directly conflict with the cost-competitive components required to meet its own decarbonization deadlines. With China controlling 92% of solar module production, 85% of battery capacity, and 90% of rare earth processing, the US faces a trilateral tension between industrial security, climate commitments, and supply chain economics—forcing policymakers to choose between strategic autonomy and transition speed.
The paradox emerged in sharp relief through Brookings Institution analysis released in March 2026. Tariff escalation under successive administrations—Biden-era levies of 25-50% on solar and 7.5-25% on batteries, followed by Trump-era increases pushing battery Tariffs to 82.4% and solar duties as high as 3,521% on Cambodian imports—collided with Inflation Reduction Act (IRA) incentives designed to accelerate domestic manufacturing. The result: a ‘valley of death’ for projects planned under IRA-era assumptions, now stranded between expired subsidies and prohibitive import costs.
Tariff escalation meets capital scarcity
The One Big Beautiful Bill Act (OBBBA), effective July 2025, cancelled $27 billion in Greenhouse Gas Reduction Fund allocations and $5 billion in clean energy loan programs, per Enkiai regulatory analysis. Simultaneously, Foreign Entity of Concern (FEOC) restrictions tightened material sourcing requirements: batteries must contain 60% non-Chinese materials in 2026, escalating to 85% by 2030. Over 100 existing or planned US solar and battery factories backed by majority-Chinese shareholders now face compliance cliffs with no transition funding.
Chinese battery exports reached $66.761 billion in the first ten months of 2025, according to Asia Financial, while CATL alone captured 38% of global EV and energy storage battery share. More than 90% of lithium-ion cells deployed in the US storage market in 2024 came from China, Energy Storage News reported, citing Rho Motion data. Tariffs that now approach 82.4% on Chinese LFP cells have not eliminated dependency—they have merely increased project costs while domestic alternatives remain 5-10 years from scale.
“The United States faces a strategic paradox: its transition toward energy security currently relies on a global supply chain dominated by Chinese manufacturing.”
— Brookings Institution analysis
IRA momentum hits policy reversal
Between 2021 and 2024, the IRA attracted $126 billion in announced clean energy manufacturing projects, driving total reshoring announcements to $1.7 trillion by end-2024, with EV batteries and semiconductors accounting for 35% of job creation. Global energy transition investment reached $2.3 trillion in 2025, up 8% from 2024, BloombergNEF reported. US investment grew 3.5% to $378 billion despite policy headwinds—a slowdown relative to global peers that signals capital hesitation.
The policy reversal created immediate friction. Solar tariffs on Southeast Asian imports—where Chinese manufacturers relocated production to circumvent earlier duties—reached 375% for Vietnam and Thailand, and 3,521% for Cambodia, the South China Morning Post reported in April 2025. Average US tariffs under the Trump administration hit 23%, the highest since the 1930s. Project developers faced a choice: absorb cost increases that render projects uneconomic, or delay construction until domestic Supply Chains mature—pushing decarbonization timelines into the 2030s.
Rare earth chokepoint
China’s dominance extends beyond assembly: the country controls 90% of rare earth processing and 94% of rare earth magnet manufacturing critical to motors and generators, Michigan Journal of Economics analysis found. Guillaume Pitron, author of ‘The Rare Metals War’, noted: “Without them, so many of our technologies would cease to function and China is at the heart of the whole industry.” US reshoring announcements focus on final assembly and cell production, but upstream processing—refining lithium, processing graphite, manufacturing separators—remains concentrated in China with capital requirements that exceed current US industrial policy budgets.
The supply chain lock-in is structural, not transient. Building rare earth separation facilities requires 7-10 years and $500 million to $1 billion in capital per plant. Polysilicon production, the feedstock for solar cells, faces similar timelines. Brookings panel discussions in March 2026 framed the central question: “If you’re going to allow some Chinese investment, some Chinese tech machinery, and some Chinese technology, what are your guardrails?” The tension between speed and security has no technical solution on timelines relevant to 2030 climate targets.
The Trump administration announced a 90-day pause on reciprocal tariffs in April 2025, creating uncertainty for 2026 tariff policy. However, anti-dumping duties and FEOC restrictions remain in force, preserving the core policy collision between security and transition speed. Project developers face continued uncertainty as tariff policy remains subject to executive action without legislative guardrails.
Strategic autonomy versus transition speed
The policy paradox forces a binary choice the US has not explicitly acknowledged: accelerate decarbonization using Chinese components and capital, accepting supply chain dependency, or pursue strategic autonomy through reshoring at the cost of missing climate deadlines. Brookings analysts argue the current approach delivers neither outcome effectively—tariffs slow the transition without building adequate domestic capacity, while FEOC restrictions eliminate Chinese capital without substituting alternative financing.
Industry analysts note the ‘whack-a-mole’ dynamic: manufacturing relocates to circumvent tariffs, triggering new duties in a cycle that raises costs without reshoring production. Battery storage projects, which require 90%+ Chinese cells, will “continue to use Chinese cells even with these higher tariffs due to a real lack of alternatives,” an industry expert told Energy Storage News. The alternative—delaying projects until US battery gigafactories reach scale in the late 2020s—conflicts with grid decarbonization targets that assume storage deployment this decade.
What to watch
Three inflection points will determine whether the US navigates this paradox or remains trapped in it. First, 2026 FEOC compliance deadlines will test whether domestic supply chains can meet 60% non-Chinese material thresholds—early project cancellations or exemption requests will signal capacity gaps. Second, Congressional action on IRA extensions or OBBBA reversals in the 2026 budget cycle could restore transition capital or cement the policy reversal. Third, rare earth processing investments announced in 2025-2026 will reveal whether private capital judges strategic autonomy viable on relevant timelines—or whether upstream dependencies remain structural through 2035.
The broader question: whether other economies—Europe, India, Southeast Asia—accelerate their own transitions using Chinese components while the US prioritises security over speed, creating a climate policy divergence with geopolitical consequences. China’s $66.7 billion in battery exports and 92% solar share position it to supply the global transition regardless of US policy. The US must decide whether strategic autonomy justifies becoming a transition laggard, or whether climate credibility requires tolerating supply chain dependencies it cannot yet eliminate.