Ten climatetech startups were named most-promising at this annual Rice Alliance Energy Tech Venture Forum. Photo courtesy Rice Alliance.

Investors at the Rice Alliance Energy Tech Venture Forum have named the 10 most-promising startups among the group of 100 clean tech companies participating in the event.

The 22nd annual event was held yesterday, Sept. 18, at Rice University’s Jones Graduate School of Business and was part of the second Houston Energy and Climate Startup Week.

The most-promising startups will receive $7,000 in in-kind legal services from Baker Botts.

The 10 most-promising companies included:

  • Houston-based Xplorobot, which has developed laser gas imaging technology for the first handheld methane detection device approved by the EPA as an alternative test method
  • Seattle-based Badwater Alchemy, a desalination company that uses nano materials to purify saline water at a fraction of the cost of traditional methods
  • San Francisco-based Ammobia, which is developing a clean ammonia production process
  • Illinois-based Celadyne Technologies, which is building hydrogen for industrial decarbonization with durable and efficient fuel cells and electrolyzers
  • Massachusetts-based MacroCycle Technologies, which converts plastic waste in the form of bottles, food trays and polyester textiles into virgin-grade mPET resin
  • Massachusetts-based AtoMe, which uses nano-ceramics to develop ultra-durable metals for 3D printing
  • Colorado-based Advanced Thermovoltaic Systems (ATS) Energy, a renewable energy semiconductor manufacturing company
  • North Carolina-based Lukera Energy, which is converting waste methane into high-value fuel
  • Midland, Texas-based AI Driller, a company that uses AI and machine learning to enable remote operations and provide historical drilling data for survey management, anti-collision monitoring and iob reporting
  • New York-based Fast Metals Inc., which has developed a chemical process to extract valuable metals from complex toxic mine tailings that is capable of producing iron, aluminum, scandium, titanium and other rare earth elements using industrial waste and waste CO2 as inputs

Arculus Solutions won the People's Choice Award. The New Jersey-based company retrofits natural gas pipelines for safe hydrogen transportation. It also won Track A: Hydrogen, Fuel Cells, Buildings, Water, & Other Energy Solutions at the Energy Venture Day and Pitch Competition during CERAWeek earlier this year.

The 100 energy technology ventures selected to participate in the forum were named earlier this year. See the full list here.

Houston Energy and Climate Startup Week returns Sept. 15-19. Photo via rice.edu

8+ can't-miss events at Houston Energy and Climate Startup Week 2025

where to be

Editor's note: This article may be updated to include additional events.

The second annual Houston Energy and Climate Startup Week is less than a month away—and the calendar of events is taking shape.

The series of panels, happy hours and pitch days will take place Sept. 15-19. The Ion District will host many of the week's events.

Here are the details on some of the can't-miss events of the week:

Houston Energy & Climate Startup Week Kickoff Panel and Block Party

Join fellow innovators, founders, investors and energy leaders at this kick-off event hosted by The Ion and HETI, which will feature brief welcome remarks, a panel discussion and networking, followed by a block party on the Ion Plaza.

This event is Monday, Sept. 15, at 4 p.m. at The Ion. Register here.

Energytech Nexus Pilotathon

Grab breakfast and take in keynotes and panels by leaders from New Climate Ventures, V1 Climate, Halliburton, Energy Tech Nexus and many others. Then hear pitches during the Pilotathon, which targets startups ready to implement pilot projects within six to 12 months.

This event is Tuesday, Sept. 16, from 8 a.m.-5 p.m. at GreenStreet. Get tickets here.

Meet the Activate Houston Cohort 2025 Fellows

Meet Activate's latest cohort, which was named this summer, and also learn more about its 2024 group.

This event is Tuesday, Sept. 16, at 5 p.m. at the Ion. Register here.

New Climate Ventures Afterparty

Enjoy music, networking and carbon-negative spirits at Axelrad. Houston startups Quaise Energy, Solidec, Dimensional Energy, Rheom Materials, and Active Surfaces will also be on-site.

This event is Tuesday, Sept. 16, from 6:30-9:30 p.m. at Axelrad. Register here.

Green ICU Conference: Sustainability in Health Care for a Healthier Future

Houston Methodist will host its inaugural Green ICU Conference during Houston Energy & Climate Week. The conference is designed to bring together healthcare professionals, industry leaders, policymakers and innovators to explore solutions for building a more sustainable healthcare system.

This event is Wednesday, Sept. 17. from 8 a.m.-3 p.m. at TMC Helix Park. Register here.

Rice Alliance Energy Tech Venture Forum

Hear from clean energy startups from nine countries and 19 states at the 22nd annual Energy Tech Venture Forum. The 12 companies that were named to Class 5 of the Rice Alliance Clean Energy Accelerator will present during Demo Day to wrap up their 10-week program. Apart from pitches, this event will also host keynotes from Arjun Murti, partner of energy macro and policy at Veriten, and Susan Schofer, partner at HAX and chief science officer at SOSV. Panels will focus on corporate innovation and institutional venture capital.

This event is Thursday, Sept. 18, from 7:30 a.m.-5 p.m. at Rice University’s Jones Graduate School of Business. Register here.

Shell STCH Open House

Get a behind-the-scenes look at how Shell is leveraging open innovation to scale climate tech. The open house will spotlight two Houston-based startups—Mars Materials, which converts captured CO2 into acrylonitrile, and DexMat, which transforms methane into high-performance carbon nanotube fibers.

This event is Thursday, Sept. 18, from 8:30 a.m.-12:15 p.m. at Shell Technology Center. Register here.

ACCEL Year 3 Showcase

Celebrate Advancing Climatetech and Clean Energy Leaders Program, or ACCEL, an accelerator program for startups led by BIPOC and other underrepresented founders from Greentown Labs and Browning the Green Space. Two Houston companies and one from Austin are among the eight startups to be named to the 2025 group. Hear startup pitches from the cohort, and from Greentown's Head of Houston, Lawson Gow, CEO Georgina Campbell Flatter and others.

This event is Thursday, Sept. 18, from 5-8 p.m. at Greentown Labs. Get tickets here.

Halliburton Labs Finalists Pitch Day

Hear from Halliburton Labs' latest cohort of entrepreneurs. The incubator aims to advance the companies’ commercialization with support from Halliburton's network, facilities and financing opportunities. Its latest cohort includes one company from Texas.

This event is Friday, Sept. 19, from 8 a.m.-noon at The Ion. Register here.

Chevron Energy Innovation Finals

The University of Houston will present the 4th Annual Chevron Innovation Commercialization Competition.

The event is Friday, Sept. 19, from 10 a.m.-1:30 p.m. at the University of Houston. Register here.

Houston Energy and Climate Startup Week was founded in 2024 by Rice Alliance for Technology and Entrepreneurship, Halliburton Labs, Greentown Labs, Houston Energy Transition Initiative (HETI), Digital Wildcatters and Activate.

Last year, Houston Energy and Climate Startup Week welcomed more than 2,000 attendees, investors and industry leaders to more than 30 events. It featured more than 100 speakers and showcased more than 125 startups.





Houston Energy and Climate Startup Week is coming back for a second year. Photo via GHP

Houston Energy and Climate Startup Week announces 2025 dates, key events

comeback tour

Six local organizations focused on the energy transition have teamed up to bring back Houston Energy and Climate Startup Week.

The second annual event will take place Sept. 15-19, according to an announcement. The Ion District will host many of the week's events.

Houston Energy and Climate Startup Week was founded in 2024 by Rice Alliance for Technology and Entrepreneurship, Halliburton Labs, Greentown Labs, Houston Energy Transition Initiative (HETI), Digital Wildcatters and Activate.

“Houston Energy and Climate Startup Week was created to answer a fundamental question: Can we achieve more by working together than we can alone?” Jane Stricker, senior vice president at the Greater Houston Partnership and executive director of HETI, said in the release.

So far, events for the 2025 Houston Energy and Climate Startup Week include an introduction to climatetech accelerator Activate's latest cohort, the Rice Alliance Energy Tech Venture Forum, a showcase from Greentown Labs' ACCEL cohort, and Halliburton Labs Pitch Day.

Houston organizations New Climate Ventures and Digital Wildcatters, along with Global Corporate Venturing, are slated to offer programming again in 2025. And new partners, Avatar Innovations and Decarbonization Partners, are slated to introduce events. Find a full schedule here.

Other organizations can begin entering calendar submissions starting in May, according to the release.

Last year, Houston Energy and Climate Startup Week welcomed more than 2,000 attendees, investors and industry leaders to more than 30 events. It featured more than 100 speakers and showcased more than 125 startups.

"In 2024, we set out to build something with lasting impact—rooted in the ingenuity of Houston’s technologists and founders. Thanks to a collaborative effort across industry, academia, and startups, we’ve only just begun to showcase Houston’s strengths and invite others to be part of this movement," Stricker added in the release. "We can’t wait to see the city rise to the occasion again in 2025.”

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Energy giant Shell lists Houston HQ for sale for $325 million

asset offload

Energy giant Shell has put its U.S. headquarters in Houston’s Energy Corridor on the market and is exploring the sale of its U.S. chemical business.

Green Street News reported Shell just listed its longtime Energy Corridor campus at 150 N. Dairy Ashford Road. The asking price is $325 million, The Real Deal reported. Shell plans to lease back half of the nearly 1.5 million-square-foot Woodcreek campus for 15 years.

A sale-leaseback deal could transform the 43.6-acre campus into a multitenant hub, CoStar News reported.

“Houston is a critical hub for Shell globally and the headquarters of our U.S. businesses,” a Shell spokesperson told the Houston Business Journal. “We remain committed to Houston and are evaluating opportunities to optimize our Woodcreek campus as part of our ongoing review of workplace needs while maintaining a strong presence in the city.”

Shell occupied its first building at the West Houston campus in 1980. The company employs more than 6,000 people in Texas.

Shell is one of the highest-profile businesses occupying space in the Energy Corridor. It’s home to 67,000 workers, more than 27 million square feet of office and mixed-use space, and 3.8 million square feet of retail and restaurant space.

Shell considers $8B sale of chemical business

As the company seeks to unload its Woodcreek campus, The Financial Times reported Shell is looking into selling its U.S. chemical business. The price tag: $8 billion.

Potential buyers include Spring-based ExxonMobil and Houston-based LyondellBasell.

Shell operates four chemical plants in Texas, Louisiana and Pennsylvania, producing an array of chemicals for use in plastics, detergents and pharmaceuticals.

Shell CEO Wael Sawan said last year that the company had spent $45 billion in capital “that is underperforming for us,” split between its chemical business and renewable energy arm.

Shell also agreed to sell its solar and wind power business in India this summer. Read more here.

Trump continues to champion data center growth despite rising voter concerns

Data Development

President Donald Trump, speaking alongside cryptocurrency leaders at the White House, made a statement that Republican and Democratic candidates alike wouldn't touch.

“If I were the mayor of a town or the governor of a state, and I had a chance to get a big plant in, an AI plant or a data center,” Trump said, “I would absolutely want it because the jobs are enormous and the money paid, the taxes paid, are just enormous.”

It's not the kind of message anyone is using in competitive midterm races.

The race to build data centers, which power artificial intelligence and cloud computing, has run aground amid frustration from voters who don't want to live near the massive warehouse campuses. Even the Senate Republicans' campaign arm warned that anger over data centers — some of which dwarf football stadiums and use more energy than small cities — could cost them a seat.

Opposition stretches across the political spectrum because of fears that the behemoths will jack up electricity bills, drain people's water wells, create unhealthy amounts of air and noise pollution and forever change a community's character — all while getting lucrative tax breaks from states competing for their business.

Trump has framed data centers as a necessary component of a top national and economic security priority: winning the AI race against China. However, he also has acknowledged concern over rising electricity bills, previously saying “it’s only fair” for the companies to shoulder their costs.

He also suggested this week that data centers need “a little public relations help.” In recent months, he has gotten tech giants to sign a voluntary pledge to shield U.S. consumers from higher utility bills from data centers, even as he pushes to streamline the process for companies and utilities to build their own power plants.

But building power plants doesn't happen overnight, and the immediate political reality for candidates across the country is far different.

“It is yet another dimension in which the White House appears tone deaf — tone deaf at best and indifferent to the interest of other Republican candidates at worst,” said James Henson, the director of the Texas Politics Project at the University of Texas, Austin, a nonpartisan research organization.

Republican committee issues warning over data centers in Ohio

Statewide candidates from Nevada to Pennsylvania, both Republican and Democratic, are weaponizing data centers against their opponents, and candidates who absorb those attacks are subsequently trying to distance themselves from them.

In Ohio, a data center hot spot with closely contested races for governor and U.S. Senate, the National Republican Senatorial Committee warned in a memo Tuesday that Sen. Jon Husted is vulnerable to losing his seat because of the centers.

Democratic nominee Sherrod Brown is airing attack ads against Husted that call him the “face of data centers in Ohio” as people gather signatures for a statewide referendum to ban their construction.

The Republican memo said it's been a “sleeper issue for the entire election cycle.”

“Brown is using it because it works,” the NRSC said. “More than any other thing in this race, data centers are the anchor hanging around Husted’s neck. If he loses and data centers get the blame, politicians across the country will take notice — and they will not go near the next one.”

The memo suggested voters may balk at Democratic candidates who want to stop data center construction altogether in favor of a Republican candidate who only wants data centers built if a community approves it in a local vote and it pays for its own power, water and other utilities.

Most registered voters oppose building a data center in their area, according to a July Fox News poll.

Still, the issue falls behind other voter concerns, such as cost of living, as November looms. A Quinnipiac Poll conducted in June asked voters what issues were important in deciding who to vote for in U.S. House elections, and about 4 in 10 mentioned AI data centers.

Trump’s statement already put to use in Nevada race

In Nevada, Democrat Aaron Ford quickly tied Trump’s statement to Republican Gov. Joe Lombardo, characterizing them as being in “lockstep on data centers.”

In a statement, Ford said Trump and Lombardo are “Nevada data centers’ biggest cheerleaders” who “only care about catering to their ‘billionaire friends’ while Nevadans pay the price.”

Ford this week unveiled a policy platform in which he said he would halt new state tax breaks for data centers — he estimated them at $200 million currently — while auditing existing projects to ensure they are delivering on promises. He also said he would ensure data centers pay for their electricity needs, do not deplete Nevada’s water supply and help local governments negotiate strong benefits agreements with developers.

Texas' governor changed course and got a jab from Trump

Texas Gov. Greg Abbott, who last November celebrated Google’s announcement of a $40 billion investment there by calling the state “the epicenter of AI development,” is under attack from his Democratic challenger, Gina Hinojosa, over his pursuit of data center development.

Abbott has since changed course by promising tougher action, such as removing the state’s sales tax exemption and holding up projects to review their energy usage.

Trump criticized the shift, saying “I think it's a mistake” in a recent interview with Punchbowl News.

Asked about Trump's support for data centers, Abbott's office said the governor's “top priority is to protect Texans’ safety and quality of life and ensure the integrity of our power grid and water supply.”

“Simply put, Texans must come first,” Abbott's office said.

Data centers complicated Wisconsin governor race

While Trump embraces data centers, even some of his allies are using them for political attacks. U.S. Rep. Tom Tiffany, running for Wisconsin governor, released a TV ad this week branding his Democratic opponent as “Data Center David Crowley.”

The ad includes a clip of Crowley saying Wisconsin could become the “AI and data hub not only for the entire country, but for the entire globe.”

Crowley has said local communities must have veto authority while also calling data centers a part of the modern economy that could bring significant economic benefits to the state.

Tiffany, who Trump has endorsed, has also said positive things about data centers. In January, Tiffany called data centers “exciting new technology,” in an interview with PBS Wisconsin. And last December, he voted for a bipartisan bill known as the SPEED Act, which is designed to accelerate construction of new AI infrastructure projects like data centers. It hasn't passed the Senate.

Neither Tiffany nor Crowley support a moratorium on new data center construction.

Tiffany has called for repealing the state tax incentive for data centers, while Crowley has not. They both have called for stricter regulation.

Crowley, at an event Wednesday where he received the endorsement of the environmental group Clean Wisconsin, downplayed the attacks Tiffany has made against his data center position.

“He’s getting very good at saying one thing and doing something different,” Crowley said, pointing to Tiffany’s votes in support of the SPEED Act.

“What Congressman Tom Tiffany’s doing is lying because he’s trying to run away from his record in Congress,” Crowley said.

Houston startup wins Space Force contract to advance quantum energy generator

quantum contract

Houston-based quantum energy technology startup Casimir Inc. has been awarded an STTR Phase I contract from the U.S. Space Force's SpaceWERX to support the development of the company's solid-state generator for potential use by the Department of the Air Force.

SpaceWERX is the innovation arm of the U.S. Space Force and a division within AFWERX, the incubator and innovation arm of the United States Department of the Air Force. The Air Force Research Laboratory and SpaceWERX, along with many other government agencies, help support innovation through the Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) grants and contracts.

As part of the new contract, Casimir will work to refine a fully independent generator. Casimir’s solid-state power technology could support national security missions by providing reliable power even in difficult-to-service environments.

In May, Casimir emerged from stealth, netting a $12 million seed round to commercialize its quantum energy chip. The semiconductor chips can generate power from quantum vacuum fields without the need for batteries or charging. The company aims to include the chips in large-scale energy systems that can power homes, commercial infrastructure and electric vehicles.

“This STTR funds some analysis work to address our proposed scaling approach of making our chips multi-layer to increase aggregate power,” Harold “Sonny” White, founder and CEO of Casimir, tells Energy Capital.

White adds that the company will work with Texas A&M to develop chip planarization techniques to support Casimir’s plans to scale. Additionally, White says the company is working with the U.S. Space Force to explore more applications for its technology.

“Casimir’s technology brings a new capability to the market in the form of our persistent power chips,” White adds. “This approach will be relevant to ultra-low-power electronics, and with the scaling approach we are developing, connected with the STTR work, will eventually be relevant to consumer electronics and beyond.”

Casimir has previously reported that it plans to commercialize its first-generation MicroSparc chip by 2028. The chips are expected to power devices for years without the need for replacements.

The total funding for this project has not yet been disclosed.