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#005 ·10 JUL 2026 ·FRIDAY ·6 MIN READ ·10 STORIES + 12 EXTRAS

Chemistry class

Sodium-ion batteries entered commercial production, compressed CO2 storage broke ground, zinc hybrid-cathode batteries landed nearly a gigawatt-hour of Texas contracts, and enhanced geothermal drilled faster than anyone projected — all while the US solar and wind tax credits expired without replacement. The bottom line: the energy storage industry diversified its chemistry faster this week than at any point in its history, against a policy backdrop where the world's second-largest clean-energy market just removed its primary financial incentive.

01 / The Ten

The week, ranked

10

US solar and wind tax credits expire with no extension

The production and investment tax credits for wind and solar lapsed on July 4 as part of budget reconciliation, with no emergency extension. The credits supported an estimated $500+ billion in clean energy investment since 2022; their removal raises new-project financing costs by 20-30% for unlocked contracts.

Why it mattersThe largest single US clean energy policy reversal in decades. The immediate effect is a freeze on final investment decisions for projects without secured financing — a pause that compounds with every week it continues.
01 heatmap.news↗

Sodium-ion goes commercial: CATL validates, Peak Energy builds US gigafactory

CATL unveiled the first field-validated grid-scale sodium-ion storage system, backed by a 60 GWh supply deal with integrator HyperStrong. In California, Peak Energy committed $71M to a 4 GWh sodium-ion pack factory in Sacramento with GM backing. Residential player Unigrid launched a 10,000-cycle sodium-ion home battery.

Why it mattersSodium-ion exiting the lab into commercial deployment across grid, commercial, and residential markets in a single week marks the chemistry's transition from future technology to present-tense product.
02 catl.com↗

Three US microreactors hit first criticality on July 4

The Department of Energy confirmed that three advanced microreactor designs completed zero-power criticality demonstrations on July 4, meeting a presidential milestone. The events mark the first new US critical reactor experiments outside the national lab system in decades.

Why it mattersThree simultaneous commercial-pathway demonstrations arriving on schedule is a meaningful signal for the microreactor timeline. Criticality is the point where a nuclear chain reaction sustains itself — the rest is engineering.
03 energy.gov↗

China's BESS integrators hold 76% of the global storage market

Research shows Chinese system integrators — led by CATL, BYD, and Sungrow — held 76% of global battery energy storage market share in 2025. No Korean firm appears in the top-10 BESS cell supplier list for the first time.

Why it matters76% market concentration restructures everything downstream: procurement alternatives, insurance terms, and how government industrial policy attempts to create alternatives.
04 energy-storage.news↗

Fervo drills to 19,448 ft in 21 days, closing in on $3K/kW geothermal

Fervo's Sawtooth 7 well reached 19,448 feet in 21 days — 35% deeper and with 50% greater lateral reach than Phase I wells — after improving drilling rates 143% since 2023. Current costs sit at roughly $5,500/kW against a long-term target of $3,000.

Why it mattersEnhanced geothermal is one of the few firm clean-power sources with no fuel cost. The cost curve is compressing faster than most forecasters expected, and every drilling improvement compounds.
05 heatmap.news↗

Storage chemistry diversifies: CO2, zinc, and hydrogen-iron join lithium

Victoria, Australia broke ground on a 200 MWh compressed-CO2 long-duration storage plant. Eos zinc hybrid-cathode batteries landed 920 MWh across four Texas sites. Dutch firm Elestor partnered with Europe's largest wind farm for a 10-to-40-hour hydrogen-iron flow battery system.

Why it mattersThree non-lithium chemistries reaching commercial deployment or final investment decision in a single week represents a structural diversification of the grid storage supply chain.
06 energy-storage.news↗

Palisades nuclear restart reaches watershed moment

Michigan's Palisades plant — the first US reactor to restart after decommissioning began — reached a key milestone in its return-to-operation programme. Palisades is the test case for whether closed US nuclear plants can be economically and technically revived under the ADVANCE Act framework.

Why it mattersThe cheapest new nuclear is a reactor that already exists. A successful restart validates the technical and regulatory pathway for a larger pool of idled US reactors to come back online.
07 heatmap.news↗

US offshore wind collapsing: developers paid to cancel leases

Federal agencies are reportedly compensating developers to terminate leases, a 50% tariff on imported turbine components has made project economics unworkable, and the tax credit expiration removes the final backstop. European and Asian offshore wind construction continues to accelerate.

Why it mattersThe supply chain that does not get built now will take years to recreate. The gap between US and global offshore wind trajectories is widening from policy divergence into structural industrial divide.
08 heatmap.news↗

Tesla opens $250M competition to double 4680 cell production

Tesla launched an open competition inviting battery manufacturing startups to propose solutions doubling 4680 cell output at Giga Berlin from approximately 9 GWh to 18 GWh, with a $250 million investment in the winner.

Why it mattersThe 4680 cell's slower-than-planned ramp is a known constraint on Tesla's cost targets. Opening the problem externally suggests internal solutions have not yet delivered the needed throughput gains.
09 tesla.com↗

India curtails one-third of new renewable capacity due to grid constraints

Approximately one-third of India's recently commissioned renewable capacity faces curtailment because transmission has not kept pace with generation. Solar curtailment peaks at 50-60% during daylight hours in Rajasthan and Gujarat.

Why it mattersIndia is running the world's largest new clean-energy build, and a third of the investment sits idle. This is the canonical argument for why transmission must lead generation rather than follow it.
10 pv-magazine.com↗
02 / Also

Worth knowing

12
CATL Tianxing II: 8C peak charge for logistics EVs
A battery peaking at 8C takes a cell from flat to 80% in under seven minutes, backed by 4,000 charging and swap stations across 190 Chinese cities.
catl.com ↗
BYD passes 17 million NEVs — two million built in seven months
BYD's production pace implies roughly 290,000 units per month, a battery demand machine that continues to compress per-kWh costs globally.
byd.com ↗
LG Energy Solution misses Q2, accelerates ESS pivot
Preliminary Q2 results fell short as EV battery demand softened, while grid storage demand grew. LG confirmed it is accelerating its shift toward ESS cell production.
lgensol.com ↗
EU funding rules to exclude high-risk inverters from 14% of solar demand
Wood Mackenzie forecasts EU restrictions on Chinese inverters will affect roughly 28 GWdc of European solar through 2030, extending to 12% of BESS deployments.
pv-magazine.com ↗
27.3% efficiency in inverted perovskite solar cell
A Chinese team achieved record efficiency in the inverted perovskite architecture preferred for tandem stacking, using dual-molecule interface passivation.
pv-magazine.com ↗
ES Foundry reaches 3 GW US solar cell capacity
A South Carolina factory expansion produces PERC bifacial cells qualifying for the full IRA domestic content bonus — one of the largest US solar cell manufacturing footprints.
pv-magazine.com ↗
UK approves 1.2 GW solar including 740 MW One Earth project
Three large solar sites with co-located storage received development consent ahead of the eighth Contracts for Difference allocation round.
pv-magazine.com ↗
Argentina closes 700 MW BESS procurement in single tender
The AlmaSADI tender awarded contracts adding dispatchable battery capacity to a grid strained by demand growth.
renewablesnow.com ↗
Dubai certifies world's first purpose-built commercial vertiport
The UAE's aviation authority certified VDX near Dubai International Airport for eVTOL air taxi operations — the first certification of a facility designed from scratch for electric vertical flight.
skyports.net ↗
QuantumScape pivots to licensing solid-state battery technology
Progress at the Eagle Line pilot facility accompanies a strategic shift from manufacturing to licensing, with Volkswagen's PowerCo as the anchor partnership.
quantumscape.com ↗
Winaico back-contact solar module reaches 24.5% efficiency at 500 W
A Taiwanese back-contact module touching 600 W under bifacial conditions, with 30-year warranties at 0.35% annual degradation, targeting space-constrained commercial rooftops.
pv-magazine.com ↗
Unigrid sodium-ion residential battery: 10,000-cycle lifespan
A 9.25 kWh sodium-ion home battery rated for 10,000 cycles with passive thermal management, eliminating the active cooling that adds cost and failure points to LFP competitors.
pv-magazine.com ↗
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#008The Buildout Gets a Billion and a Record#007New chemistries, old frictions#006Solid-State Clears QA, Sodium Breaks Ground#005Chemistry class#004American LFP, European mandates, and the tax credit cliff#003The sodium clock starts ticking#002The Chemistry Turns#001The Month Solar Passed Coal
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