Josh Posamentier, co-founder and managing partner at Congruent Ventures, will join Venture Houston as a speaker this year. Photo via congruentvc.com

It's been a challenging year for venture capital, but how are climatetech startups doing specifically? One Bay Area investor shares his point of view on this this topic ahead of Venture Houston next week.

Joshua Posamentier, co-founder and managing partner of Congruent Ventures, a San Francisco-based firm that invests in early-stage sustainable companies, is taking the stage at Venture Houston on September 7. Among others, Posamentier will be in conversation with the founder of one of his firm's portfolio companies, Fervo Energy, discussing seed and early-stage funding for sustainability-focused startups.

Venture Houston is presented by HX Venture Fund, a fund of funds that deploys capital into non-Houston firms to encourage investment in local startups. This year's theme is "Spotlighting the path for decarbonization in a digital world."

Posamentier, who has worked over a decade in this space, shares some of his thoughts on Houston as an energy transition leader, the challenges climate-tech startups face, and more in an interview with EnergyCapital.

EnergyCapital: How do you see Houston and its role in this energy transition, its challenges, its opportunities, etc.?

Josh Posamentier: I actually tend to disagree with the people that say Houston is too far down the oil and gas path. I mean, it's it's capitalism at the end of the day. There's money to be made in in climate mitigation technologies. People are going to go chase it, and I think Houston, of all places, is a pretty capitalistic city. And people are definitely not shy about chasing the next big opportunity. I mean, it was oil and natural gas before, and now it's now it's alternative energy. And so I think from that perspective, it's fine. There's a lot of money.

I think the biggest challenge is honestly, especially on a perception basis, a lot of the policy and social stuff that's endemic to Texas, which is a bummer. I mean, especially for younger talent. Austin had a shine, but I think that's largely gone and Houston never had it. So, I think it's something that needs to be overcome and needs to be thought about at a state level basis, especially if you're going to want to attract young entrepreneurial talent.

EC: What are some of the challenges energy transition startups are facing these days? How is your fund kind of supporting your portfolio companies through these challenges?

JP: There's some normalization that's had to happen over the last 9 to 12 months. As you know, corrections have come down the pipe in the venture ecosystem. By all accounts, it has been really frothy for the last few years, especially so in parts of climate. Some of that's due to the the proliferation of investment from non climate-specific firms. And it's, in many ways, decoupled from the ups and downs of different parts of the venture ecosystem, but it also has different timelines. I think not everyone always appreciates what that means and what that implies for for startups. So there's a lot of frustration and a lot of missed expectations in the early stage part of the ecosystem that are slowly getting fixed. I think getting expectations more in line with reality is going to help immensely.

The other thing is just figuring out how to talk more in a language that venture investors understand. I think that's a little bit of a challenge. There's there's actually a pretty big gap between if you're an oil and gas developer and thinking about how you fund that kind of a business versus how you fund a technology-enabling business. Fervo Energy is an interesting example. It's a tech company, but now it's really a tech enabled developer because they have no choice but to do that full stack. They went to school out here. They understand the ecosystem. They've really taken the effort to really understand all the capital players. And so we're waiting to see how that ultimately plays out.

But there's just different capital. I think it is a little challenging. And this is a good thing. There does need to be a way, I think, to just get people more exposure to to the market there — in the Houston market specifically. If you're spinning at Stanford, there are hundreds of VCs within walking distance. In Houston, the ones I know I can count on one hand.

EC: Has that pace of commercialization changed over the years or have founders found ways to survive that valley of death?

JP: I don't think anything's really changed fundamentally. I think people have gotten a little more clever about understanding how the adoption occurs, and figuring out how to phase into those processes that that comes with experience. But there's only so much acceleration you can do when you're dealing with critical infrastructure. You know, people are not going to want to just jump right in, rip out, and replace things that keep the lights on. And so you just have to figure out how to how to capitalize a business in such a way that you can you can live with those kinds of timelines. Venture capital is a fantastic tool, and it is far from the right tool for every problem. And so there are plenty of opportunities to deploy other tools that are more appropriate to different kinds of different kinds of challenges.

EC: What attracted you to investing in Fervo Energy?

JP: So, it's how we think about portfolio construction. Fervo has an amazing team, which we will bend a lot of rules for, and we saw this opportunity as something they could build a ton of value by validating the tech, establishing a huge land position, and then raising different kinds of capital for the out years and for the project development. A bunch of our companies took venture capital to develop a technology, and then they know that venture is not the right class of capital to then scale that throughout the world and whatever. So they would basically raise other forms of capital in the out years to deploy the technologies.

EC: And one of those options is government funding. How do your portfolio companies utilize that?

JP: A big chunk of our portfolio has some government money, even if it's very early stage research grants or something like that. I see government money being the most effective in a couple of ways. One way obviously is to get the core research out of it versus just spin it into something more commercial that we can all then look at.

The other place that is really exciting is in is getting technologies to scale where they're then cost effective without further subsidies. When we underwrite companies, we are very explicitly underwriting them in the absence of subsidies at scale. The assumption is those are just there to basically bridge the gap between "this is totally uneconomic because it's a tiny, tiny little factory or something" versus "it would be plenty economic if it were a big factory." So, if they can just bridge that gap with a little bit of government money.

We've been through this this cycle a couple of times, and we can't in good faith underwrite anything assuming that government subsidies are going to continue. We very much believe it's a bridge — it's got to be a bridge to something. It can't be a bridge to nowhere. And I think there are a lot of companies out there today that are almost designed to just pump the government incentives, and that's not a recipe for a business that can grow on its own over time.

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This conversation has been edited for brevity and clarity.

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Houston researcher develops efficient method to cool AI data centers

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A University of Houston professor has developed a new cooling method that can remove heat at least three times more effectively from AI data centers than current technologies.

Hadi Ghasemi, a distinguished professor of Mechanical & Aerospace Engineering at UH, published his findings in two articles in the International Journal of Heat and Mass Transfer. The findings solve a critical issue in the growing AI sector, according to UH.

High-powered AI data centers generate huge amounts of heat due to the GPU and operating systems they use with extreme power densities, which introduce complex thermal challenges. Traditionally, cooling methods, like microchannels, which use flow and spray cooling, have had limitations when exposed to extreme heat flux, according to UH.

Ghasemi’s research, however, found a more effective way to design thin-film evaporation structures to release heat from data centers and electronics at record performance.

Ghasem’s solution coupled topology optimization and AI modeling to determine the best shapes for thin film efficiency, ultimately landing on a branch-like structure—resembling a tree.

The model found that the “branches” needed to be about 50 percent solid and 50 percent empty space for optimum efficiency, and that they could sustain high heat fluxes with minimal thermal resistance.

“These structures could achieve high critical heat flux at much lower superheat compared to traditionally studied structures,” Ghasemi said in a news release. “The new structures can remove heat without having to get as hot as previous removal systems.

Ghasemi’s doctoral candidates, Amirmohammad Jahanbakhsh and Saber Badkoobeh Hezave, also worked on the project. The team believes their results show the impact of a physics-aware, AI design and can help ensure reliability, longevity and stability of AI data centers.

“Beyond achieving record performance, these new findings provide fundamental insight into the governing heat-transfer physics and establishes a rational pathway toward even higher thermal dissipation capacities,” Ghasemi added in the release

Texas federal judge allows lawsuit against California AG over ExxonMobil remarks

In the News

A federal judge in Texas ruled that ExxonMobil can bring a defamation lawsuit against California’s attorney general over comments about the company’s plastic recycling efforts.

U.S. District Judge Michael J. Truncale in the Eastern District of Texas said in a ruling in February that California Attorney General Rob Bonta cannot claim official immunity in regards to several statements he made, including one in a campaign email sent to Texas residents.

Bonta sued Exxon in September 2024, saying that the oil giant encouraged consumers to purchase plastics products with the promise that the products would be recycled. He said less than 5% of plastic is recycled into another plastic product, and that recycling processes touted by Exxon don't work. Exxon said the problem is with California's recycling system.

Exxon later sued Bonta in his individual capacity and environmental groups for defamation, saying that the comments harmed current and future business contracts. The lawsuit was filed in Texas, near its principal place of business.

Truncale dismissed the lawsuit against the environmental groups but allowed it to proceed against Bonta.

The judge pointed to a campaign email Bonta sent to Texas residents saying that only 5% is recycled and the rest ends up in the environment and in our bodies: “Exxon Mobil knew, and Exxon Mobil lied.” Bonta, a Democrat, argued he was simply updating email recipients on his office's activities.

But Truncale said a campaign contribution link on the email turned the communication into a campaign activity not protected by immunity in Bonta's official capacity as attorney general.

“Here, the contribution request betrays the email's true nature: a campaign promotion. Campaigning is not within Bonta's scope of employment,” the judge wrote.

Bonta has filed a notice of appeal.

“The Attorney General looks forward to vigorously litigating this case, and is proud to advance his lawsuit against ExxonMobil,” his press office said.

ExxonMobil said in a statement that the “campaign of lies designed to derail our advanced recycling business must stop.”

Houston startup debuts sustainable, bio-based 'leather' fashions

sustainable fashion

Last month, Houston-based Rheom Materials and India’s conscious design studio Econock unveiled a collaborative capsule collection that signaled more than just a product launch.

Hosted at Lineapelle—long considered the global epicenter of the world's premier leather supply chain—in the vaulted exhibition halls of Rho-Fiera Milano, the collection centered around Rheom’s 91 percent bio-based leather alternative, Shorai.

It was a bold move, one that shifted sustainability from a concept discussed in panel sessions to garments that buyers could touch and wear.

The collection featured a bomber-style jacket, an asymmetrical skirt and a suite of accessories—all fabricated from Shorai.

The standout piece, a sculptural jacket featuring a funnel neck and dual-zip closure, was designed for movement, challenging assumptions about performance limitations in bio-based materials. The design of the asymmetrical skirt was drawn from Indian armored warrior traditions, according to Rheom, with biodegradable corozo fasteners.

Built as a modular wardrobe rather than isolated pieces, the collection reflects a shared belief between Rheom and Econock in designing objects that adapt to daily life, according to the companies.

The collection was born out of a new partnership between Rheom and Econock, focused on bringing biobased materials to the market. According to Rheom, the partnership solves a problem that has stalled the adoption of many next-gen textiles: supply chain friction.

While Rheom focuses on engineering scalable bio-based materials, New Delhi-based Econock brings the complementary design and manufacturing ecosystem that integrates artisans, circular materials and production expertise to translate the innovative material into finished goods.

"This partnership removes one of the biggest barriers brands face when adopting next-generation materials,” Megan Beck, Rheom’s director of product, shared in a news release. “By reducing friction across the supply chain, Rheom can connect brands directly with manufacturers who already know how to work with Shorai, making the transition to more sustainable materials far more accessible.”

Sanyam Kapur, advisor of growth and impact at Econock, added: “Our partnership with Rheom Materials represents the benchmark of responsible design where next-gen materials meet craft, creativity, and real-world scalability.”

Rheom, formerly known as Bucha Bio, has developed Shorai, a sustainable leather alternative that can be used for apparel, accessories, car interiors and more; and Benree, an alternative to plastic without the carbon footprint. In 2025, Rheom was a finalist for Startup of the Year in the Houston Innovation Awards.

Shorai is already used by fashion lines like Wuxly and LuckyNelly, according to Rheom. The company scaled production of the sugar-based material last year and says it is now produced in rolls that brands can take to market with the right manufacturer.

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This article originally appeared on our sister site, InnovationMap.