ExxonMobil and its Denbury carbon capture unit are facing an expanded antitrust and unfair competition lawsuit in Texas, after a blue ammonia developer alleged the companies leveraged control over a carbon dioxide pipeline to cut off a rival project.

The suit, filed by start-up Clean Hydrogen Works, has added ExxonMobil as a defendant, alleging that after Exxon acquired CO2-enhanced oil recovery firm Denbury, the oil and gas major forced Denbury to break existing agreements with it.

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