The Environmental Protection Agency plans to unveil long-awaited greenhouse gas standards for new power plants on Tuesday, an administration official said.

The draft rules, which have been delayed for months, are under attack from Capitol Hill Republicans and the party’s leading White House hopefuls, who want to strip EPA’s power to regulate the emissions.

Limiting carbon emissions from coal-fired power plants has been a longtime goal for environmental groups.

The White House Office of Management and Budget completed its review of the proposed rules on Monday, its website shows.

The Associated Press reported that the proposed rule will not apply to existing plants or plants built in the next year.

AP reported that it will give future coal plants years to meet the standard, and eventually require capture and storage of carbon emissions, a technology that has not yet been commercialized in the power sector.

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