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/daily ·11 SEPT 2026 ·FRIDAY ·2 MIN READ ·6 STORIES

Tandem Record, Grid Alert

Longi and Soochow crack 34% tandem solar efficiency, NERC sounds a level-3 alert over data centre load swings, and US solar quietly passed 50 million homes' worth of capacity.

01 / The Day

FRIDAY 11 SEPT 2026, ranked

06

Longi-Soochow Set 34% Tandem Record

Longi Green Energy and Soochow University certified a 34.04% power-conversion efficiency for perovskite-silicon tandem solar cells, edging past the previous 33.9% record set earlier this year.

  • 34.04% certified efficiency—highest ever for perovskite-silicon tandem architecture
  • Single-junction silicon is capped near 29.4%; tandems can theoretically reach 43%
  • Commercial tandem modules remain 2–3 years from cost-competitive mass deployment
Why it mattersEach percentage point gained compresses the cost-per-watt curve for next-generation utility-scale solar.
01 pv-magazine.com↗

US Solar Crosses 50 Million-Home Milestone

Cumulative US solar installations now generate enough electricity to power 50 million average homes, according to EIA data compiled by CleanTechnica—a threshold crossed without fanfare in late August.

  • Total installed capacity surpassed 350 GW, up from 200 GW three years ago
  • Utility-scale projects account for roughly 75% of capacity; rooftop solar the remainder
  • At current build rates, a 100-million-home equivalent is projected by 2030
Why it mattersThe milestone reframes solar from a niche addition to the backbone of US electricity supply.
02 cleantechnica.com↗

Sodium-Ion Cell Hits 206 Wh/kg

A Chinese battery startup published validated results showing a sodium-ion pouch cell achieving 206 Wh/kg energy density, closing the gap with LFP lithium batteries and removing a key objection to sodium-ion for stationary storage.

  • 206 Wh/kg rivals the 200–220 Wh/kg range of commercial LFP cells
  • Sodium is roughly 1,000x more abundant than lithium and avoids cobalt entirely
  • Cycle-life data (2,000+ cycles to 80% capacity) meets grid storage requirements
Why it mattersIf the figure holds at scale, sodium-ion removes the energy-density objection to diversifying away from lithium supply chains.
03 pv-magazine.com↗

NERC Issues Level-3 Alert on Data Centre Load

NERC elevated its grid reliability alert to Level 3 across three US regions, citing unprecedented demand volatility from AI data centres that can ramp 500 MW in under ten minutes—faster than most dispatchable generation can follow.

  • Level 3 is NERC's second-highest alert tier, indicating elevated near-term supply-shortfall risk
  • Data centre loads in the affected regions grew 38% year-on-year through Q2 2026
  • Grid operators are requesting voluntary demand-response curtailment from large industrial users
Why it mattersAI infrastructure is now large enough to move grid reliability indices—a feedback loop between the tech sector and energy policy that regulators had not modelled.
04 energy-storage.news↗

China H1 Storage Falls; Overseas Shipments Surge 83%

China installed 28 GWh of new grid storage in H1 2026, down 9% year-on-year—the first domestic decline on record—while Chinese manufacturers shipped 83% more battery storage to international markets over the same period.

  • Domestic slowdown attributed to grid connection backlogs and revised subsidy schedules
  • Overseas shipments totalled 18 GWh in H1, with Europe and Southeast Asia as primary destinations
  • Export surge is compressing storage prices in target markets by an estimated 12–18%
Why it mattersA satiated home market funnelling surplus capacity overseas will reshape global storage pricing for the next 18 months.
05 energy-storage.news↗

Google Signs Nuclear PPA with Fortum

Google confirmed a long-term power purchase agreement with Finland's Fortum for output from the Loviisa nuclear plant—its first direct nuclear PPA in Europe—covering an undisclosed share of Google's Finnish data centre load.

  • Loviisa supplies roughly 10% of Finland's annual electricity; Fortum owns and operates both reactors
  • The fixed-price PPA insulates Google from Nordic spot-market volatility
  • Google now holds nuclear PPAs in three countries: US (Kairos SMR), UK (Hinkley Point C), and Finland
Why it mattersBig Tech's appetite for firm, low-carbon power is turning nuclear PPAs from novelty into standard procurement practice.
06 heatmap.news↗
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/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