The convergence of green banking with evergreen experimentation in support of a growing green economy sounds like just the right shade of green. Photo by micheile henderson/Unsplash

The term “Energy Transition” doesn’t merely imply change, it demands it. And with change comes another kind of change–usually of the dollars and cents kind.

While many aspire to embrace more sustainable and cleaner energy solutions in their communities, the affluence needed to deploy necessary infrastructure often sits just outside of reach. Until now, that is.

With the rise of “green banking,” securing financing for the adoption of energy efficiency, implementation of decarbonization technologies, and broader provision of renewable energy is now more accessible. Funds at green banks, backed by a blend of public and philanthropic contributions, tap into the modern trend of crowdfunding to support egalitarian and climate improvement efforts.

However, green bank financing is structured with repayment of–or a return on–capital expected at the end of the term, meaning approval tends only to be granted to proven and established projects well past the research and development stage. Given the Energy Transition is, for the most part, still in its infancy, clearing such hurdles can be difficult.

But Houston is full of dreamers and doers; researchers and entrepreneurs eager to tackle the next big challenge. It would come as no surprise then, that Texas’ first green bank, the Clean Energy Fund of Texas (“CEFTx”), bucks tradition with a novel Memorandum Of Understanding (“MOU”) co-signed by the Houston Advanced Research Center (“HARC”) to finance efforts staunchly entrenched in R&D activity.

As the Energy Transition foothold grows, Houstonians are compelled not just to invest in green initiatives, but to drive them. Which only makes sense, considering the deep expertise in energy innovation led most recently by the Houston-area shale revolutionaries from Mitchell Energy. Established over 40 years ago by George P. Mitchell himself, HARC plants the seeds of transformation at the intersection of science, resilience, sustainability, and the environment.

Per the March 29 news release from CEFTx, John Hall, President & CEO of HARC says, “We are excited to join forces with the team at Clean Energy Fund of Texas as they drive green investment in low-income and disadvantaged communities. Our research expertise and experience in managing state and federal grants will be a true benefit to Texans.”

The recent MOU brings Energy Transition visionaries the capital necessary to explore, test, develop, and deploy innovative solutions from conception to maturity. Entrepreneurs at all stages of the business lifecycle are encouraged to apply for funding on the CEFTx website or connect with HARC at an upcoming event to discover how the two entities can take ideas from dream to reality.

“It’s an honor to work with the esteemed researchers at HARC, who have been studying sustainability for decades,” says Stephen Brown of CEFTx in the release. “Together we can be even more effective at kickstarting investments in solar power, retrofits, and other technologies that help create the green workforce of tomorrow.”

The fresh approach to funding set up by CEFTx and HARC positions new companies to succeed and enables existing companies to progress in the transition to a more sustainable #futureofenergy. It’s just the sort of sense that is needed to truly drive change.

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Houston maritime startup raises $43M to electrify cargo vessels

A Houston-based maritime technology company that is working to reduce emissions in the cargo and shipping industry has raised VC funding and opened a new Houston headquarters.

Fleetzero announced that it closed a $43 million Series A financing round this month led by Obvious Ventures with participation from Maersk Growth, Breakthrough Energy Ventures, 8090 Industries, Y Combinator, Shorewind, Benson Capital and others. The funding will go toward expanding manufacturing of its Leviathan hybrid and electric marine propulsion system, according to a news release.

The technology is optimized for high-energy and zero-emission operation of large vessels. It uses EV technology but is built for maritime environments and can be used on new or existing ships with hybrid or all-electric functions, according to Fleetzero's website. The propulsion system was retrofitted and tested on Fleetzero’s test ship, the Pacific Joule, and has been deployed globally on commercial vessels.

Fleetzero is also developing unmanned cargo vessel technology.

"Fleetzero is making robotic ships a reality today. The team is moving us from dirty, dangerous, and expensive to clean, safe, and cost-effective. It's like watching the future today," Andrew Beebe, managing director at Obvious Ventures, said in the news release. "We backed the team because they are mariners and engineers, know the industry deeply, and are scaling with real ships and customers, not just renderings."

Fleetzero also announced that it has opened a new manufacturing and research and development facility, which will serve as the company's new headquarters. The facility features a marine robotics and autonomy lab, a marine propulsion R&D center and a production line with a capacity of 300 megawatt-hours per year. The company reports that it plans to increase production to three gigawatt-hours per year over the next five years.

"Houston has the people who know how to build and operate big hardware–ships, rigs, refineries and power systems," Mike Carter, co-founder and COO of Fleetzero, added in the release. "We're pairing that industrial DNA with modern batteries, autonomy, and software to bring back shipbuilding to the U.S."

Shell partners with UK-based co. for hydrogen electrolyzer pilot

ultra-efficient electrolyzer

Shell Global Solutions International, a subsidiary of Shell, which maintains its U.S. headquarters in Houston, has signed a collaboration agreement with London-based Supercritical Solutions to advance Supercritical’s ultra-efficient hydrogen electrolyzer technology toward a field pilot demonstration.

In the deal, the companies will collaborate on a paid technology feasibility study that will support the evaluation and planning of the pilot demonstration, according to a news release. Supercritical Solutions’ technology aims to deliver high-efficiency renewable hydrogen at a lower cost for the industrial hydrogen market.

"Signing this collaboration agreement with Shell is a major milestone for Supercritical Solutions and an important step on our commercialisation journey,” Luke Tan, co-founder of Supercritical, said in the news release. “We are directly addressing the cost and complexity barriers facing the renewable hydrogen market. We are excited to move forward with a company like Shell, whose global leadership has been proven to accelerate innovative technologies to market.”

Supercritical’s hydrogen electrolyser technology can operate at high temperatures and pressures of up to 220 bar without the need for an external hydrogen compressor, rare-earth materials or easily degradable membranes. The technology removes the typical compression step in the process while delivering hydrogen at industry standards. It requires significantly less energy than many traditional electrolyzers and is more cost-efficient.

This recent investment builds on an ongoing relationship between Shell and Supercritical. Supercritical was founded in 2020 and was runner-up in Shell’s New Energy Challenge, which helps startups and scaleups develop sustainable technologies, in 2021. Shell Ventures then invested in Supercritical’s Series A funding round in 2024 with Toyota Ventures.

3 Houston-area companies named to Global Cleantech 100

Energized

Three Houston-area companies—Amperon, Hertha Metals and Vaulted Deep—appear on this year’s Global Cleantech 100 list.

The unranked list, generated by market intelligence and advisory firm Cleantech Group, identifies the 100 privately held companies around the world that are most likely to make a significant impact in the cleantech market over the next five to 10 years.

For the 2026 list, Cleantech Group received more than 24,000 Global Cleantech 100 nominations from nearly 60 countries. Cleantech Group scored those companies and narrowed the contenders to 264. An expert panel reviewed those nominees, and the list was whittled down to the 100 winners.

Here’s a rundown of the three Houston-area honorees:

Amperon

Founded in 2018 by Sean Kelly and Abe Stanway, Houston-based Amperon offers an AI-enabled energy forecasting and analytics platform designed to help stabilize electric grids. Amperon received undisclosed amounts of venture capital from National Grid Partners and Tokyo Gas Co. Ltd. last year and announced a recent investment from Samsung Ventures earlier this month.

Hertha Metals

Founded in 2022 by Laureen Meroueh, Conroe-based Hertha Metals provides a single-step process for producing sustainable steel. Last year, the company emerged from stealth mode and raised more than $17 million in venture capital.

Vaulted Deep

Vaulted Deep’s technology injects excess organic waste underground to remove carbon dioxide from the atmosphere. Julia Reichelstein and Omar Abou-Sayed founded the Houston-based company in 2023. Last year, the startup raised $32.3 million in venture capital. Also in 2025, Vaulted Deep signed a 12-year deal with software giant Microsoft to remove up to 4.9 million metric tons of carbon dioxide from the environment.

Vaulted Deep also made the list last year, along with Houston-based Syzygy Plasmonics and Fervo Energy. Fervo was also named the 2025 North American Company of the Year by Cleantech Group.