HPM has been covering the integration of thermal energy storage (TES) into the global energy mix heavily throughout 2025. The questions we get back aren’t asking why—they’re asking what. As in, what exactly is TES, and is it another complicated, drawn-out energy market investment proposition?
We get it. The term “thermal energy storage” itself often deters readers from continuing. But here’s the reality: it’s a remarkably simple concept that’s being embraced by energy providers in the know—particularly those who know what’s coming.
The concept’s beauty lies in its simplicity—heat up a material, store that heat, and release it when it’s needed. That’s it. Whether it’s crushed rock, sand, or another heat-retaining medium, the idea is straightforward: capture energy when it’s abundant, cheap, and renewable, and deploy it when it’s valuable. No exotic minerals, no dangerous chemical reactions, no moving parts. Just clever thermal engineering solving a problem batteries weren’t built to solve.
Of course, delivering that value at a commercial scale is where things get more complex. That’s the hard part—and that’s the part Brenmiller Energy (NASDAQ: BNRG) has already figured out. Thanks to Brenmiller, TES isn’t some future-tech pipedream. It’s live. It’s real. It’s working now.
A Distinction Worthy Of Value
While other high-valuation private TES startups talk about what they hope to build, Brenmiller is doing it. Right now. And that distinction matters—especially when BNRG is trading at a valuation of roughly $5.6 million, compared to private-sector peers who have valuations in the hundreds of millions despite, for the most part, still being clutched in development mode.
To put it directly, investors should consider capitalizing on this massive valuation disconnect before the window closes.
And it’s starting to. BNRG’s trading volume has exploded higher, with recent sessions running more than 10X above average daily volume. It’s not hard to see why. Investors are catching on, particularly after a recent capital raise sent shares lower—creating an entry point that’s rightfully attracting serious attention. Keep in mind that when you see ADV statistics, they’re skewed higher now due to massive volume surges, with shares trading in the tens of millions compared to the tens of thousands just weeks ago.
The point is this—the interest in BNRG is well-deserved. With electrification and renewables reshaping the global energy mix, the industry and investors are finally catching up to a reality Brenmiller Energy has been acting on for years: batteries and solar panels alone can’t solve industrial heat or grid stability. Especially not at scale and not 24/7/365.
That’s where TES comes in.
TES Can Be Energy’s Most-Valued Partner
It’s cost-effective. It’s durable. And unlike lithium-ion systems, it doesn’t degrade, overheat, or depend on fragile global supply chains. TES fills the gap that batteries can’t reach—replacing fossil-fuel-powered industrial tools, such as boilers, reducing demand charges, providing cost-of-energy certainty, and unlocking the full potential of renewables by absorbing excess generation and dispatching it as heat or steam whenever and wherever it’s needed. In other words, it brings order to chaos.
Just as important, TES isn’t locked into one format. It integrates on the grid—through demand response programs and virtual power plants—and off the grid, where energy independence isn’t optional; it’s required. The SolWinHy green methanol project in Spain proves the point: entirely disconnected from the national grid, it operates on solar and wind energy. That’s a great start. But where things matter most—energy delivery and system stability—SolWinHy will rely on Brenmiller’s TES to make it all function. That distinction matters. And it should be valued.
The European Hydrogen Bank allocated €7 million of SolWinHy’s €25 million grant directly to Brenmiller. That’s a sovereign endorsement of BNRG’s bGen™ system and its irreplaceable role in the clean energy value chain. The better news for BNRG is that SolWinHy is likely just the first domino to drop in a model expected to be repeated across Europe and beyond.
In other words, there is plenty more to appreciate and factor in when appraising BNRG.
Supporting The Value Proposition
Start with the fundamentals. In a space where being first matters, Brenmiller Energy isn’t just early—they’re proven. While names like Rondo Energy have achieved $500 million valuations based on future potential, Brenmiller has more than $40 million worth of infrastructure already deployed. Yet its market cap still trades at just $5.6 million on June 2nd. That kind of disparity doesn’t last forever, especially with the soon-to-be-funded SolWinHy project in its pocket.
It also helps that BNRG remains the only pure-play TES stock available to U.S. investors. There is no ETF or broader basket. If you want exposure to industrial-scale thermal storage, this is it. Need more to justify the value proposition? Check this slew of partnerships.
Brenmiller has formed strategic alliances with Entelios in Germany to integrate TES into advanced grid systems, with Viridi Energy and Green Enesys in Spain, and with Rock Energy in the USA to deliver carbon-neutral heating across institutional buildings and campuses. These aren’t speculative collaborations. They’re revenue-aligned, deployment-driven relationships with a clear commercial roadmap.
A Milestone Is Weeks Away
But timing may be the most critical part of this story. The company’s next major commercial deployment, at the Tempo Beverage plant in Israel, is slated for July 2025. That’s not years away; it’s weeks away. With that added validation, more than €200 million of European pipeline activity is lining up behind it. And with SolWinHy, potentially another sovereign-funded order at any time.
The kicker—beyond the pipeline, Brenmiller Energy is exploring IP monetization to generate near- and long-term shareholder value without dilution. To put it simply, the pieces are in place for BNRG to realize its transformative TES moment. Not years from now, but weeks from now.
With real deployments, partnerships, sovereign validation, and a validated TES platform, it’s hard to say this in any other way—seize this investment opportunity while the discount window is open. If the adage “volume precedes price” is valid, it’s already starting to close.
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