TerraFlow Energy, an energy storage and infrastructure company based in Katy, Texas, has acquired FlowCellutions, a Houston startup that builds sensors and diagnostic software for flow batteries. Energy Capital HTX reported the deal on November 2, 2026, citing a TerraFlow press release.
Terms were not disclosed. FlowCellutions will keep its name and operate under the tagline "A TerraFlow Energy Company". Its founder and chief executive, Becca Segel, becomes president of the business.
The deal brings one of Houston's younger battery technology companies inside a storage developer that was itself founded only in 2024. TerraFlow's chief executive is Jon Parrella.
What FlowCellutions built
Flow batteries store energy in liquid electrolytes rather than in solid electrodes. FlowCellutions, founded in 2022, specialises in electrochemical sensing, diagnostics, analytics and testing for these systems, according to Energy Capital HTX.
On its website the company describes its product as the first state-of-health system made uniquely for flow batteries. Its sensors are meant to detect harmful side reactions in the electrolyte early, and its software offers a real-time data dashboard, predictive maintenance and assessments of how long a battery will last. It is sold as a software subscription with yearly licence updates.
The company says its platform could extend the working life of a flow battery from about seven years to more than 30. It supports data centers and other heavy power users, Energy Capital HTX reported.
“Joining TerraFlow gives us the opportunity to apply that work at a much larger scale,”
Why TerraFlow is buying
Parrella said FlowCellutions' expertise fits TerraFlow's plans as it moves from developing storage systems to deploying them at commercial scale. "FlowCellutions brings a depth of scientific and technical expertise that fits naturally with where TerraFlow is going," he said in the release, adding that at that stage "understanding performance at a deeper level matters".
Segel said her team's work on understanding and improving flow batteries would now be applied more widely. "Joining TerraFlow gives us the opportunity to apply that work at a much larger scale," she said.
TerraFlow has set large ambitions. In August it signed a memorandum of understanding with Shoals Technologies tied to deploying up to 5 gigawatts of systems a year, Dealroom reported. Shoals has said that work is still at the engineering stage and that it does not expect revenue from it before 2027.
Energy Capital HTX described TerraFlow as a Katy-based energy storage and infrastructure company founded in 2024. Neither report gave TerraFlow's own funding, revenue or the number of battery systems it has installed so far, so the size of its commercial pipeline beyond the Shoals agreement is not known. The release also did not say whether the purchase was paid in cash or shares.
The founder and the funding
FlowCellutions has not reported any venture capital rounds. It has raised more than $2 million in non-dilutive funding, which does not require giving up equity, including $1.5 million from the US National Science Foundation earlier in 2026, according to Energy Capital HTX. It is a member of Greentown Labs.
Segel founded the company and ran it as chief executive until the sale. The release did not say how many people work at FlowCellutions or whether TerraFlow plans to expand the team.
FlowCellutions was one of five finalists in the Energy Transition Business category of InnovationMap's 2026 Houston Innovation Awards, the publication noted.
Competition in flow batteries
Flow battery developers are competing for the same large power users that FlowCellutions targets. Dealroom noted that Certain Energy, a rival in the sector, raised a funding round in August.
For FlowCellutions, a grant-funded startup, the sale provides a parent company with commercial ambitions on which to test its sensors at larger scale, as Segel's comments suggested. Neither company said whether FlowCellutions will keep selling its subscription platform to other flow battery makers, or how its products will be built into TerraFlow's own systems.
