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/daily ·01 SEPT 2026 ·TUESDAY ·2 MIN READ ·6 STORIES

Record quarter, import ban, perovskite pivot

The US set an all-time battery storage record in Q2, then the President moved to restrict the components needed to build the next quarter's. Japan decided silicon solar is over. A difficult Tuesday for clean energy planning departments.

01 / The Day

TUESDAY 01 SEPT 2026, ranked

06

Trump bans imports of inverters, batteries, and grid transformers

President Trump signed an executive order banning imports of solar inverters, battery energy storage systems, and large power transformers, citing grid security threats — a sweeping restriction that simultaneously hits every major component in the clean energy supply chain.

  • The ban covers the three components in every utility-scale solar-plus-storage project simultaneously: inverters, BESS units, and step-up transformers
  • Most US grid inverters are sourced from China, Europe, and Taiwan; domestic manufacturing capacity is a fraction of current demand and cannot scale in months
  • The grid-security framing mirrors Section 232 tariff authority but extends it to equipment rather than materials — a legal distinction that will face court challenges
Why it mattersA simultaneous ban on inverters, batteries, and transformers is not a speed bump for the energy transition — it is a potential supply chain seizure at the moment the grid needs the most equipment in its history.
01 energy-storage.news↗

US sets all-time quarterly record: 20.2 GWh of battery storage in Q2 2026

America's battery storage market commissioned 20.2 GWh in Q2 2026 — a new quarterly record arriving in the same news cycle as an executive order restricting the imports on which most of that equipment depended.

  • 20.2 GWh in one quarter exceeds total US battery storage installations for all of 2023, illustrating the pace of market scaling
  • The record predates the inverter and BESS import ban; Q3 will be the first quarter built under the new supply constraints
  • Utility-scale solar-plus-storage drove the bulk of commissioning; most equipment was contracted 12-18 months before delivery and imported before the order
Why it mattersThe Q2 record and the August import ban arrived in the same week — the gap between the best quarter in US battery history and the policy threatening to stop the next one is currently zero.
02 electrek.co↗

Japan cuts silicon solar from subsidies — perovskite or nothing from 2027

Japan's Ministry of the Environment will exclude conventional silicon solar panels from subsidy programmes from fiscal 2027, redirecting all government support to next-generation perovskite technology — a bet on domestic manufacturing rather than imported crystalline silicon.

  • Japan has negligible silicon solar manufacturing capacity; subsidising silicon panels transfers public money to Chinese and South Korean producers
  • Perovskite cells suit Japanese industrial chemistry and precision manufacturing — the policy bets on a technology Japan can own and export
  • The cutoff creates an immediate silicon install rush: projects must close before 2027 to capture remaining subsidies, pulling forward near-term demand
Why it mattersA G7 economy formally declaring silicon solar a technology it will no longer subsidise is a significant industrial policy signal — and a preview of the reasoning that other governments will copy.
03 pv-magazine.com↗

Section 232 tariffs push US solar module prices back to 2023 levels

New Section 232 trade measures have driven US spot solar module prices above 40 cents per watt, reversing two years of cost declines and raising the installed cost of utility-scale solar at the moment when construction pipelines are their largest on record.

  • 40 cents per watt versus 25-28 cents in global markets represents roughly a 50% landed-cost premium for US utility-scale projects
  • Analysts project a path to 30 cents per watt as domestic assembly scales under IRA incentives, but the timeline is 18-24 months
  • Projects with locked module pricing pre-tariff are largely insulated; projects in active procurement are absorbing the full impact on already-stressed developer margins
Why it mattersA 50% module cost premium at the moment the US utility-scale pipeline is at record size delays projects, strands capital, and shifts deployment timelines by years — the kind of friction that compounds.
04 pv-magazine.com↗

BW ESS breaks ground on Germany's largest battery system — 5.7 GWh

BW ESS began construction of a 5.7 GWh battery energy storage system at the former Klostermansfeld copper smelter site in Germany, the country's largest grid battery project, as the company targets 11 GWh of total European deployed capacity by 2029.

  • 5.7 GWh at Klostermansfeld uses a brownfield industrial site, avoiding the greenfield permitting delays that have stalled clean energy projects across Europe
  • German grid storage is accelerating as wind curtailment losses mount during overgeneration periods; storage converts stranded power into revenue
  • BW ESS's 11 GWh target by 2029 would rank it among Europe's largest independent battery storage operators, expanding across Germany, UK, and Benelux
Why it mattersGermany's grid needs storage more urgently than almost any European market; the largest grid battery in the country breaking ground confirms the capital is committed and the regulatory path is clear.
05 pv-magazine.com↗

SunHydrogen breaks 10% solar-to-hydrogen efficiency at panel scale

Iowa-based SunHydrogen demonstrated over 10% solar-to-hydrogen conversion efficiency with 100 cm² photoelectrochemical modules — a significant step toward making direct solar hydrogen production commercially competitive with electrolysis paired with grid solar.

  • 10% efficiency at 100 cm² is the scale at which laboratory results begin to translate into manufacturable panel geometries rather than microscale demonstrations
  • SunHydrogen targets approximately 15% efficiency in its next development phase, the threshold where direct solar hydrogen approaches green electrolyser economics
  • The approach eliminates the intermediate electricity step of solar-to-grid-to-electrolyser, reducing balance-of-plant complexity and potential round-trip efficiency losses
Why it mattersIf direct solar-to-hydrogen can reach 15% panel-scale efficiency, the economic case for a distinct solar hydrogen sector begins to close — this confirms the milestone at 10% with a working manufacturable module.
06 pv-magazine.com↗
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