The Brief Brief Energy Tech
the build-out: batteries, renewables, electric flight.
Energy Tech — briefly, then briefly again · tbb.ceo
listen tothe daily 0:00 –:––
/daily ·13 SEPT 2026 ·SUNDAY ·2 MIN READ ·7 STORIES

Solid State Sunday

ProLogium enters mass production at 381 Wh/kg, CATL's aviation battery clears thermal runaway certification, and xAI's Memphis data centre reveals the largest private battery storage system yet built.

01 / The Day

SUNDAY 13 SEPT 2026, ranked

07

ProLogium Begins Mass Production at 381 Wh/kg

ProLogium announced the start of mass production of its all-solid-state battery cells reaching 381 Wh/kg gravimetric and 903 Wh/L volumetric energy density — figures that exceed current lithium-ion cylindrical cells by roughly 40% and mark the first solid-state cell at this density to enter commercial-scale production.

  • 381 Wh/kg vs. typical 250–270 Wh/kg for best-in-class NMC lithium-ion at pack cell level
  • Mass production milestone at ProLogium's Gigafactory in Taiwan following €5.2B French facility announcement
  • Primary target is EV OEMs seeking range improvements without increased pack volume
Why it mattersMass production — not lab demonstration — at 381 Wh/kg is the moment solid-state transitions from R&D story to supply chain reality.
01 prologium.com↗

CATL Aviation Battery Passes Dual-Cell Thermal Runaway Test at 350 Wh/kg

CATL's aviation-grade lithium battery achieved 350 Wh/kg energy density and passed dual-cell thermal runaway safety certification — a test requiring that a failing cell does not propagate fire to adjacent cells — unlocking its use in commercial eVTOL aircraft.

  • Dual-cell thermal runaway containment is the key aviation safety threshold; lithium-ion has historically failed it
  • 350 Wh/kg enables ~60-minute eVTOL flight ranges at commercial payload, versus 20–30 minutes on current cells
  • CATL has supply agreements with EHang, Joby, and Wisk; certification applies to all three programmes
Why it mattersAviation thermal runaway certification is the regulatory gate between eVTOL prototyping and revenue flight operations — CATL just opened it at meaningful energy density.
02 batteriesnews.com↗

xAI Memphis Data Centre Installs Largest Private Battery System on Record

Canary Media reported that xAI's Memphis Colossus data centre has installed a battery energy storage system exceeding 400 MWh — the largest private-sector BESS deployment on record — to provide backup and grid-stabilisation capacity for the 150 MW AI training facility.

  • 400+ MWh system can power the full facility for roughly 2.7 hours without grid connection
  • Memphis grid operator confirmed the BESS is also enrolled in frequency-response ancillary services
  • Cost estimated at $200–240M based on current utility-scale battery pricing
Why it mattersWhen AI infrastructure becomes the driver of the world's largest private battery installations, the energy storage market's growth trajectory is structurally linked to compute demand.
03 canarymedia.com↗

Vattenfall Commits to 1 GWh BESS at Former Nuclear Site in Germany

Swedish utility Vattenfall confirmed a final investment decision on a 1 GWh battery energy storage project at the decommissioned Brunsbüttel nuclear site in Germany — repurposing grid connection infrastructure from the closed plant for large-scale storage.

  • Brunsbüttel has 1.4 GW grid connection from the former nuclear plant — avoiding the main bottleneck for BESS projects
  • 1 GWh is the largest single-site BESS commitment in Germany; grid feed-in begins Q3 2027
  • Project benefits from Germany's capacity market reforms introduced following the 2025 grid stress events
Why it mattersRepurposing decommissioned nuclear grid connections for battery storage is a replicable model across Germany's 17 closed plants — this is the proof of concept.
04 energy-storage.news↗

AnteoTech Signs Silicon-Anode Battery Deal with Airspeeder

Australian battery materials company AnteoTech signed a commercial agreement to supply its silicon-anode binder technology to Airspeeder, the electric racing aircraft series — providing a performance validation pathway for its high-cycle silicon anode materials at extreme charge/discharge rates.

  • Airspeeder racing cells require 10C+ discharge rates; silicon anodes provide higher capacity vs. graphite
  • Commercial deal follows lab validation showing AnteoTech's binder maintains capacity over 800 cycles at high rates
  • Racing-series validation has been a proven commercialisation path for Formula E battery suppliers
Why it mattersSilicon anode materials need high-stress validation environments before automotive adoption; motorsport is the credible proving ground with a short timeline to published data.
05 listcorp.com↗

Chinese Scientists Set 27.35% Efficiency Record for Perovskite-Organic Tandem Solar

Researchers at the Chinese Academy of Sciences demonstrated a perovskite-organic tandem solar cell achieving 27.35% power conversion efficiency — a record for this architecture — by using a molecular interlayer to reduce non-radiative recombination at the perovskite-organic junction.

  • 27.35% exceeds the previous record of 26.4% set in February 2026 by a South Korean team
  • Architecture avoids lead in the organic sub-cell, reducing toxicity vs. all-perovskite tandems
  • Stability testing shows <5% degradation after 1,000 hours under AM1.5G illumination
Why it mattersPerovskite-organic tandems offer a lower-toxicity path to 30%+ efficiency; each record moves the production cost case closer to silicon replacement.
06 pv-magazine.com↗

BESS Is Now Cost-Competitive for Data Centre Backup, Volta Report Finds

The Volta Foundation's annual battery competitiveness report finds that utility-scale BESS has crossed the cost threshold for data centre backup power applications in most US markets — undercutting diesel generator total cost of ownership over a 10-year asset life at current battery prices.

  • BESS TCO now $0.18–0.22/kWh for 4-hour systems in US markets; diesel backup averages $0.27–0.31/kWh
  • Analysis includes full diesel costs: fuel, maintenance, emissions compliance, and stranded-asset risk
  • Report notes 2-hour BESS is not yet competitive — 4-hour duration is the crossover threshold
Why it mattersCost parity for data centre backup is the high-volume commercial adoption trigger that accelerates BESS manufacturing scale the same way EV adoption accelerated Li-ion volume.
07 pv-magazine.com↗
Be subscriber #013 the weekly ten, every friday by email · no spam · unsubscribe anytime
Past days

The Daily Archive

/TUE 15 SEPTThe battery era, still accelerating/MON 14 SEPTSolid-State Sunday/SUN 13 SEPTSolid State Sunday/FRI 11 SEPTTandem Record, Grid Alert/THU 10 SEPTScotland's GWh Day, Trump's Battery Order/WED 09 SEPTNuclear Returns, Battery Prices Rise/TUE 08 SEPTRecord Books/MON 07 SEPTSolid-state goes live, silicon anodes converge, Archer flies cities/SUN 06 SEPTGrid plumbing and chemistry/SAT 05 SEPTEnergy Tech/FRI 04 SEPTCharge Forward/THU 03 SEPTSodium-Ion Double-Down/WED 02 SEPTWednesday 2 September 2026/TUE 01 SEPTRecord quarter, import ban, perovskite pivot/MON 31 AUGDendrites Solved, Curtailment Banked/SUN 30 AUGEarnings and Exits/SAT 29 AUGRenewables Close In on Gas Capacity, BESS Scales to Saudi GW Contracts, DRC Mine Goes 24/7 Solar/FRI 28 AUGFusion Fuel, Solar Records, and the Gas Boom Nobody Planned For/THU 27 AUG13 GW Texas Discharge, 60K Cycles, 6 MWh Boxes/WED 26 AUGMichigan's Gigafactory, Geothermal Goes Live, Shell Exits Home Batteries/TUE 25 AUGGas for the AI Grid