US One Big Beautiful Bill Act (P.L. 119-21): accelerated repeal of IRA clean-energy credits and FEOC restrictions on §45Y/§48E/§45X

Mechanism

P.L. 119-21 was enacted via the FY2025 budget reconciliation process, allowing it to pass the Senate on a simple-majority vote. Title VII (Finance Committee) carries the energy-tax provisions; Title VIII the FEOC / PFE definitions and material-assistance schedules. The act does not repeal the IRA structure outright — it surgically accelerates phaseout dates and inserts ownership / sourcing constraints that make several credits effectively unclaimable for projects linked to Chinese supply chains.

Credit-by-credit timeline

(Solar/wind §45Y/§48E PIS cliff is the most contested item: projects whose construction begins on or before 4 July 2026 qualify under begin-construction rules; projects beginning construction after 4 July 2026 must be placed in service by 31 December 2027 to claim. Projects beginning construction after 31 December 2025 are subject to the FEOC material- assistance test in addition.)

FEOC / PFE architecture

The act layers two related screens on top of the credits that survive:

1. Specified Foreign Entity (SFE) ownership/control. Borrows the §30D FEOC concept (entities owned, controlled by, or subject to the jurisdiction of China, Russia, Iran or DPRK; ≥25% beneficial ownership; entities on the 1260H or NDAA Section 889 lists). Projects controlled by SFEs are categorically ineligible for §45Y/§48E/§45X/§48D from 1 January 2026. 2. Material assistance from a Prohibited Foreign Entity (PFE). A graduated test on the share of project cost, component cost, or critical-mineral cost sourced from PFEs. For §45Y/§48E the non-PFE share must be ≥40% in 2026, ≥45% in 2027, ≥50% in 2028, ≥55% in 2029, ≥60% from 2030. For §45X the schedule starts higher (50% in 2026) and rises faster, reflecting that battery and critical- mineral processing remains the deepest CN-supply-chain exposure.

The combined effect is that a US-built solar or wind project beginning construction in 2027 must demonstrate <60% Chinese content across components and minerals to claim §45Y/§48E, even if it would otherwise qualify on PIS-date grounds. For battery cell and module manufacturers claiming §45X, the PFE test pushes US-domiciled JVs with CATL, Gotion, EVE, or Sunwoda into a hard recertification problem from 2026.

Severity rationale

Severity 5 (largest fiscal reversal in IPTM register). Quantitative justification:

• CBO scored the energy-credit terminations alone at roughly

USD 280bn of gross revenue gain over 10 years (sum of the §25C/§25D/§25E/§30C/§30D/§45W repeals as scored in Publication 61570). This is the largest reversal of a green-industrial-policy spending baseline by any G7 jurisdiction since the IRA itself was scored at USD 369bn (CBO 2022) / USD 800bn+ (revised Goldman/Penn Wharton).

• The FEOC overlay alone — even abstracting from credit

terminations — re-routes a multi-hundred-billion-dollar capex pipeline (battery gigafactories, solar module fabs, critical-mineral processing) away from Chinese-controlled JVs. By Q3 2025 several announced JVs (Ford-CATL Marshall MI; Gotion Manteno IL; Hyundai-LGES Bartow GA) were already restructuring to satisfy the new sourcing tests.

• The §45Y/§48E acceleration alone is expected to remove

~150-200 GW of post-2027 wind+solar buildout that was baked into pre-OBBBA forecasts (Princeton ZERO Lab, Rhodium and BloombergNEF Aug-Sep 2025 reruns), with measurable consequences for capex flows to First Solar, Sunrun, NextEra, and the upstream polysilicon / wafer supply chain.

• §48D rate increase to 35% partially offsets on the

semiconductor leg, preserving the CHIPS Act-aligned manufacturing pull. This is why the act re-shapes rather than eliminates the IRA stack — semiconductor / advanced manufacturing wins; clean-energy demand-side loses.

Downstream implications

• EV automakers (TSLA, F, GM, RIVN, LCID): §30D / §45W

cliff on 30 Sep 2025 removed up to USD 7,500 per vehicle of demand-side support; Q4 2025 / Q1 2026 EV unit sales are the leading indicator. Tesla absorbed most of the cliff via inventory pricing; legacy OEMs with unprofitable EV lines (F BlueOval, GM Ultium) face structural margin compression.

• **Battery cell makers (LG ES, Samsung SDI, SK On, CATL,

BYD):** §45X battery PTC ($35/kWh cell + $10/kWh module) is preserved but FEOC test makes Chinese-controlled US JVs unclaimable from 2026. CATL Marshall (MI) and Gotion Manteno (IL) JVs likely restructure; Korean cell makers (LGES, Samsung SDI, SK On) are net beneficiaries of the PFE overlay (FTA-partner / non-China origin).

• **Solar / wind developers (FSLR, NEE, RUN, ENPH, SEDG,

TAN ETF, FAN ETF):** §45Y/§48E begin-construction safe harbour through 4 July 2026 triggers a 12-month pull-forward in project starts; post-2026 pipeline thins materially. First Solar is the partial winner — its CdTe modules are domestically manufactured and clear the PFE test; Chinese-origin polysilicon and wafer-routed c-Si module fabs (REC Silicon, Hemlock dependants) are more exposed.

• **Critical-mineral midstream (ALB, PLL, REMX ETF, LIT

ETF, IPTM theme em-resource-upstream-capture):** §45X critical-mineral PTC (10% of cost) is preserved with PFE overlay; FTA-partner / non-China upstream (Australia, Canada, Chile, Argentina) is structurally favoured. This reinforces the pull-through created by the 2024-05-23 EU CRMA, the 2022-12-08 Canada Critical Minerals Strategy, and the 2024-05-14 Australia Future Made in Australia Act. ETF: REMX, LIT, COPX, EWA, EWC, ECH.

• Semiconductors (INTC, TSM, MU, SOXX, SMH): §48D rate

hike to 35% is a USD 20-30bn incremental subsidy for ongoing CHIPS Act-aligned fabs (Intel Ohio, TSMC AZ, Samsung TX, Micron NY). Reinforces the 2022-08-09 US CHIPS Act perimeter — semiconductors are now the only IRA-era industrial policy that survived intact and expanded.

• Cross-border response: the EU and Canada are closely

watching the OBBBA's CN-decoupling overlay. If FTA-partner jurisdictions (Korea, Japan, Australia, Canada, EU) are treated as non-PFE under final Treasury guidance, the act effectively converts the IRA into a "CHIPS-ish" ally-only manufacturing policy. If FTA-partner status proves insufficient (e.g., Korean cell makers with graphite from PRC), the act becomes a sourcing-driven supply-chain reshoring statute with much harder upstream constraints.

Open questions

• Treasury / IRS guidance on the §45Y/§48E begin-construction

safe harbour for wind+solar: whether the "5% safe harbour" / "physical work" tests inherited from §45 PTC practice carry over unchanged. Industry expects guidance Q4 2025 / Q1 2026.

• Whether the FEOC material-assistance test treats Korean,

Japanese, EU, Australian or Canadian-origin minerals routed through Chinese refineries as PFE-tainted. If yes, Korean cell makers face a deeper sourcing audit than expected; if no, the practical perimeter narrows to Chinese-controlled entities only.

• Status of the §48D semiconductor ITC rate increase to

35% under the WTO Subsidies Code. EU and Korea may file challenges if §48D awards spike post-2026 in a way that visibly disadvantages non-US fabs.

• Litigation risk: several state AGs (CA, NY, MA) signaled

in August 2025 that they would challenge the FEOC PFE rules under the Foreign Commerce Clause / Commerce-Clause preemption doctrines. Court schedule pushes any ruling into 2026-2027.

• Interaction with the 30 July 2025 Section 232 copper

proclamation and the 2025-04-02 Trump reciprocal-tariff regime: tariffs raise the cost of imported solar / wind / battery inputs at the same time the OBBBA removes the demand-side credits that absorbed those costs. Net effect on US clean-energy capex is the largest open question of the Trump-2 industrial-policy stack.