CATL unveiled its TENER Sodium energy storage system at Intersolar Europe in Munich, rated for 15,000 cycles to 70 percent state of health at room temperature. CATL frames that as a 25 to 30 year service life, and it takes only 34 modules to stand up a one gigawatt-hour site. That single specification changes how commercial storage professionals price, propose, and finance battery projects. Tim Montague and John Weaver dig into what it means, alongside Illinois growing from about 80 megawatts of solar a decade ago to over 6,000 megawatts today under the new CRGA law, SunBallast ballasted racking and what module stacking tells you about install labor, UK bids for 16 and 18 hour long-duration storage, perovskite modules reaching the residential market, El Niño shifting solar output across the US, and silver falling more than 50 percent from its 2026 peak.
Episode Highlights
CATL sodium ion battery, 15,000 cycles: CATL launched its TENER Sodium system at Intersolar Europe in Munich. It is rated for 15,000 cycles to 70 percent state of health at 25 degrees C, which CATL frames as a 25 to 30 year service life, and just 34 modules build a 1 GWh site. (Energy Storage News)
Sodium ion safety advantage: CATL claims its sodium cells cut expansion force by roughly 40 percent, generate about 35 percent less gas during thermal runaway, and hold peak surface temperatures far below comparable lithium ion. The fire and thermal-runaway story is a big part of why C&I buyers are paying attention to sodium. (Interesting Engineering)
Sodium ion in the fast-response role: John flagged a detail from a CATL hybrid storage proposal where sodium was specified for the faster-response duty and lithium for the slower role. Worth keeping in context. This is one proposal's configuration, not a blanket claim that sodium beats lithium on response everywhere.
GM and Peak Energy sodium ion partnership: General Motors is moving into stationary storage with Peak Energy, backed by a strategic investment from GM Ventures. GM will develop the sodium ion cell in its Michigan battery lab and keep exclusive manufacturing rights, while Peak integrates the cell into its passively cooled storage systems. Peak energized the first U.S. grid-scale sodium-ion system, 3.5 MWh, in Watkins, Colorado, in 2025. (Inside Climate News)
Illinois energy transition, 80 MW to 6 GW: Tim attended a Nexamp event at the company's Chicago office, where IPA director Brian Granahan reported Illinois has grown from about 80 megawatts of solar a decade ago to over 6,000 megawatts energized today, with roughly 14.5 gigawatts of wind and solar developed under the state RPS (13 GW to date plus about 1.5 GW just approved). The engine is CRGA, the Clean and Reliable Grid Affordability Act (SB 25, pronounced "Surge"), which runs its first utility-scale storage procurement in August, the opening tranche toward 3 GW by 2030 via additional 2027 and 2028 rounds. Residential VPP enrollment opens in mid-July, with ComEd and Ameren customers able to put home batteries into a short-term scheduled-dispatch pilot this summer. (PV Magazine)
SunBallast racking and install labor: The hosts walk through SunBallast ballasted, no-penetration racking and get into the labor economics of module mounting, including what the way different manufacturers stack modules for shipping tells you about handling time on the job site.
UK long-duration storage bids at 16 and 18 hours: Fresh procurement results out of Scotland and England show projects awarded at 16 and 18 hours of duration. John notes it is the first time he has seen bids at that scale and ties it to Scotland's wind-heavy generation profile. (Blue Sky)
Trina Solar perovskite module hits residential market: Trina landed its first commercial order for a perovskite-silicon tandem module, going into New Zealand's premium residential market. The record-setting module is 907 watts at 29.2 percent efficiency, certified by TUV SUD. (Perovskite Info)
El Niño and solar irradiance shifts: John walks through regional solar output swings across the US and globally. Rajasthan, India, home to some of the world's largest solar plants, is projected to run about 15 percent above its seasonal average this season. (PV Magazine)
Silver prices fall more than 50 percent: Silver has dropped from its late-January 2026 record near 121 dollars to the upper 50s, more than half off the peak, on a stronger dollar and a hawkish Fed. It matters for PV because silver paste is a real line item, and World Silver Survey data shows solar's silver demand down about 19 percent. (TheStreet)
This episode is essential for commercial solar installers, battery storage developers, community solar professionals, and clean energy policy watchers. The sodium ion story has direct and immediate implications for how professionals structure storage proposals, financial models, and customer conversations. Illinois developers will also want Tim's firsthand account of the CRGA storage procurement and the residential VPP pilot going live this summer.
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