Emails between the Sierra Club and the EPA produced through a Freedom of Information Act (FOIA) lawsuit show the green group and senior officials at the nation’s top environmental enforcer met and corresponded frequently about the agency’s work on new coal regulations.

The EPA published its long-awaited New Source Performance Standards for new coal-fired plants on Wednesday, four months after the agency announced their creation.

The EPA has repeatedly said the regulations on coal-fired power plants will not be a death blow to the industry. However, the agency was working closely behind the scenes with the Sierra Club, an environmental organization that was pushing the agency to adopt standards that would be impossible for power plants to meet.

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