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They also note that most of the carbon captured in the U.S. now eventually gets injected into the ground to force out more oil, a process called enhanced oil recovery.

But the Energy Department said neither hub would use the CO2 for enhanced oil recovery.

As deployment of the technology grows, some companies could opt to permanently sequester CO2 in saline formations, while others use it in cement production or for enhanced oil recovery, Fishman said.

In another change, DOE reversed a decision from earlier this year that would’ve barred future hubs from receiving money when using entrapped CO2 for enhanced oil recovery.

Most so-called carbon storage projects are enhanced oil recovery projects.