Electric companies are pushing back against the Environmental Protection Agency’s proposed rules to regulate greenhouse gases from power plants, arguing the Biden administration’s plan to slash carbon emissions relies on costly, unreliable technology that is not “legally or technically sound.”

Following the closing of the public comment period, the Edison Electric Institute, a trade association representing all of the United States’s investor-owned electric companies, issued its comments on the EPA’s proposed rules to address greenhouse gas emissions and existing fossil-based electric generation. The rules, which were unveiled in May, would require steep pollution cuts from plants burning coal or natural gas. The agency proposed for the plants to rely on carbon capture and storage technology to help reduce carbon emissions — a technology no power plant in the U.S. currently uses and that has been questioned by environmentalists, as well as the industry.

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“Electric companies are not confident that the new technologies EPA has designated to serve as the basis for proposed standards for new and existing fossil-based generation will satisfy performance and cost requirements on the timelines that EPA projects,” EEI’s comment reads. “This will impact electric companies’ efforts to deliver affordable and reliable electricity to customers.”

The electric companies pushed back on the EPA’s assessment of carbon capture and sequestration and hydrogen blending as the “best system of emission reductions” for coal-powered plants or natural gas-based turbines, with the agency arguing these methods are “adequately demonstrated.”

“Given the status of these technologies today and the uncertainty inherent in EPA’s future projections — especially regarding the ability to deploy the needed infrastructure that complements these technologies across the industry in a timely fashion — EPA’s assessments are not legally or technically sound based on the record before the Agency,” the comment reads.

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Expanding carbon capture technology on the scale EPA is envisioning would require dramatically ramping up a still-developing industry — and constructing thousands of miles of pipelines to carry the gas to underground storage sites.

Resistance from EEI and other energy groups could pose a hurdle to the administration’s climate agenda. President Joe Biden has set a goal of achieving a carbon, pollution-free energy sector by 2035 and a net-zero emissions economy no later than 2050.