Federal security regulators are investigating Peabody Energy Corp.’s role in development of the largest coal-fueled power plant built in the U.S. in the past three decades, the company disclosed in its annual report.

St. Louis-based Peabody, the world’s biggest private-sector coal producer, said the Securities and Exchange Commission served the company with a subpoena last month requesting information and documents related to the fledgling Prairie State project.

Peabody, in the filing Monday, did not elaborate. It said only that it was cooperating and “believes that such other pending or threatened proceedings are likely to be resolved without a material adverse effect on its financial condition, results of operations or cash flows.”

Peabody spokesman Vic Svec said in an emailed statement Tuesday that “we look forward to sharing information on what is a highly successful project.”

The Prairie State Energy Campus in Illinois’ Washington County, southeast of St. Louis, includes a 1,600-megawatt electricity generating plant and an adjacent coal mine.

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