Meet the new arrivals at Greentown Houston. Photo courtesy of Greentown Labs

Greentown Labs closed out the second quarter with the addition of 17 startups, and just over half are collaborating with the Houston location.

The technology represented by the new additions span the industries of energy, agriculture, and manufacturing, with a focus on carbon capture, electrical usage efficiency, and resource accessibility.

Carbon capture

Two of the newest Houston members, Capture6 and C-Quester, are also part of the Carbon2Value Initiative, a global partnership between the Greentown Labs, Urban Future Lab in New York, and Fraunhofer, headquartered in Michigan. C2V focuses on accelerating technology solutions that capture carbon dioxide for conversion into value-adding products and services.

Similar to the way a sponge is moistened and later wrung out, C-Quester pulls CO2 from flue gas into a temperature-sensitive material that can be heated later to release carbon, making the storage and transport of CO2 easier to manage.

Capture6 uses CO2 pulled from the atmosphere through their Direct Air Capture technology in combination with water treatment methodologies to remove excess salinity from saltwater and brine, resulting in greater freshwater recovery, usable elements for a variety of industries, and carbonates transformed into mineralized form to prevent continued carbon emissions.

Energy efficiency

The Helix MICRA filters created by Helix Earth Technologies can remove CO2 from power plants and other pollutants commonly encountered in the shipping industry. The filtering technology, initially developed for NASA, also dehumidifies air conditioning systems for more efficient energy use.

H2PRO uses its water-splitting technology, E-TAC, to produce green hydrogen in a two-step process that requires less energy to perform than the more common process of electrolysis with improved safety aspects.

Steam production and distribution get an upgrade with Imperium Technologies, the first electromechanical solution that enables previously unseen systems monitoring for reduction in greenhouse gas emissions by 20%, on average.

With a keen focus on predictive insights, eologix deploys smart sensors to give operators advance warning of situations that could cause rotor imbalances to keep wind turbines – and the energy they produce – optimized.

Resource accessibility

NW NA supports the goals of stability, predictability, and accessibility of electric-powered vehicle use with its high-power EV-charging station, mobile electricity storage units, and renewable energy measurement and forecasting tool.

From the Metaversity under development, to its oil and gas line leak detection systems, Kauel goes all-in on AI for its clients, even helping children with kinesthetic rehabilitation through augmented and virtual reality programs.

Finally, SkyH2O brings fresh, clean water to areas with limited access to existing infrastructure or natural water resources for commercial, military, and industrial use.

Another eight startups join the cohort named above as members of the Greentown Labs Boston location: Capro-X, Carbon2Stone, Cottage, Dioxycle, enaDyne, Global Algae Innovations, Terrafixing, and Thola.

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Houston robotics company partners with Marathon Petroleum to scale fleet

robot alliance

Houston- and Boston-based Square Robot Inc. has announced a partnership with downstream and midstream energy giant Marathon Petroleum Corp. (NYSE: MPC).

The partnership comes with an undisclosed amount of funding from Marathon, which Square Robot says will help "shape the design and development" of its submersible robotics platform and scale its fleet for nationwide tank inspections.

“Marathon’s partnership marks a major milestone in our mission to transform industrial tank inspection,” David Lamont, CEO of Square Robot, said in a news release. “They recognize the proven value of our robotic inspections—eliminating confined space entry, reducing the environmental impact, and delivering major cost efficiencies all while keeping tanks on-line and working. We’re excited to work together with such a great company to expand inspection capabilities and accelerate innovation across the industry.”

The company closed a $13 million series B last year. At the time of closing, Square Robot said it would put the funding toward international expansion in Europe and the Middle East.

Square Robot develops autonomous, submersible robots that are used for storage tank inspections and eliminate the need for humans to enter dangerous and toxic environments. Its newest tank inspection robot, known as the SR-3HT, became commercially available and certified to operate at a broader temperature range than previous models in the company's portfolio this fall.

The company was first founded in the Boston area in 2016 and launched its Houston office in 2019.

Eclipse Energy lands Weatherford investment to scale clean hydrogen tech

clean energy collab

Oil and gas giant Weatherford International (NASDAQ: WFRD) has made a capital investment for an undisclosed amount in Eclipse Energy as part of a collaborative partnership aimed at scaling and commercializing Eclipse's clean fuel technology.

According to a release, joint projects from the two Houston-based companies are expected to launch as soon as January 2026. The partnership aims to leverage Weatherford's global operations with Eclipse Energy's pioneering subsurface biotechnology that converts end-of-life oil fields into low-cost, sustainable hydrogen sources.

“We strongly believe the subsurface is the most overlooked climate asset,” Prabhdeep Singh Sekhon, CEO of Eclipse Energy, said in the release. “This partnership demonstrates how traditional oilfield expertise and frontier biotechnology can come together to transform the energy transition. Weatherford’s global reach and deep technical knowledge will accelerate our ability to scale our low-carbon technology rapidly and cost-effectively.”

Eclipse Energy, previously known as Gold H2, completed its first field trial this summer, demonstrating subsurface bio-stimulated hydrogen production. According to the company, its technology could yield up to 250 billion kilograms of low-carbon hydrogen, and it could also extend "beyond hydrogen, laying the foundation for the next generation of subsurface clean energy fuels."

Last month, Eclipse Energy won in the Energy Transition Business category at the 2025 Houston Innovation Awards. The company closed an $8 million series A this year and has plans to raise another round in 2026.