Clean Hydrogen Works has taken ExxonMobil to court, accusing the oil giant of turning control of a critical carbon dioxide pipeline network into a competitive weapon.

In a lawsuit filed in a Texas business court, the startup alleges Exxon derailed its Gulf Coast blue ammonia project by directing Denbury Carbon Solutions — a company Exxon acquired in 2023 for $4.9 billion — to scrap agreements vital to carbon capture and storage operations.

The case, now unfolding in Harris County, reads like an industrial chess match where the board is a 1,000-kilometer CO₂ pipeline network and the stakes stretch into the billions.

Pipeline Access at the Center of the Dispute

According to court filings, Clean Hydrogen Works (CHW) had secured access to Denbury’s extensive carbon dioxide pipeline system, infrastructure deemed essential for capturing and transporting emissions from its planned ammonia production facility.

The startup had partnered with Denbury to build a spur line linking its Ascension Clean Energy site in central Louisiana to the main CO₂ trunk line. Denbury had invested $20 million in the project and agreed to provide transportation and storage services.

But after Exxon’s $4.9 billion acquisition of Denbury in 2023, CHW claims the arrangement unraveled.

The lawsuit alleges that Exxon instructed Denbury to terminate key agreements and demand repayment of its $20 million investment. In February 2025, Denbury allegedly accused CHW of delays and sought a full refund — moves CHW contends were designed not to address performance concerns, but to destabilize a rival.

“Everything changed” after the acquisition, the company asserts in its second amended petition.

Allegations of Antitrust and Unfair Competition

The complaint accuses Exxon and its affiliate Denbury of violating agreements tied to the Ascension Clean Energy project and engaging in willful, deceptive and anticompetitive conduct.

“Defendants’ willful, deceptive, and anticompetitive actions have forced Plaintiffs to seek a replacement CO₂ transportation and storage solution,” the filing states.

Because Denbury’s pipeline is the only operational and developed CO₂ transport system in the region, CHW argues, replacing it would trigger crippling delays and costs “orders of magnitude” higher — potentially exceeding $1 billion — than what Denbury had agreed to charge.

The company claims Exxon’s control of the near-1,000-kilometer network effectively makes it a gatekeeper for blue hydrogen and ammonia ventures along the Gulf Coast.

Selective Access?

CHW further alleges that Exxon has favored certain players while sidelining others.

While Exxon has paused its own Baytown, Texas, blue hydrogen and ammonia megaproject, citing weak near-term demand, CHW contends the company has allowed CF Industries to maintain access to Denbury’s system for its Donaldsonville blue ammonia plant — located near CHW’s proposed site.

That selective access, CHW argues, underscores its claim that Exxon is using infrastructure control to consolidate influence over the emerging blue ammonia market.

Financing Risks and Project Delays

The lawsuit paints the consequences as severe.

CHW says the loss of pipeline access has rattled its financing, strained customer relationships and delayed development, while competitors with secured CO₂ transport continue advancing their projects.

“By controlling Denbury’s critical infrastructure, Exxon could consolidate its control over the blue ammonia market and act as a gatekeeper for its competitors,” the petition alleges.

CHW’s counsel, Timothy McConn, said that as discovery progressed, the broader picture came into focus.

“It became increasingly clear that the actions taken by Denbury were part of a broader scheme that was orchestrated by Exxon for improper and anticompetitive motives,” McConn said.

A Choke Point in the Low-Carbon Race

Exxon has not publicly responded in detail to the latest filing.

The case highlights a growing reality in the race toward low-carbon fuels: infrastructure — not just production technology — may be the decisive bottleneck. Carbon capture and storage networks, once seen as auxiliary, are emerging as strategic arteries. Whoever controls the pipeline may control the pace of the energy transition.

As Clean Hydrogen sued Exxon, the courtroom battle now mirrors the broader contest reshaping America’s Gulf Coast — where carbon molecules, contracts and competition collide.