CONSOL Energy Inc. (NYSE: CNX) offered $650 million of senior notes in a private placement, the company said March 24.

The notes are due 2023.

Net proceeds and revolving credit facility borrowings will buy back the roughly-$1.02 billion in outstanding 8.25% notes due 2020. They will also buy back the $250 million in outstanding 6.375% notes due 2021. Tender offers for the notes began March 9, the company said.

Any remaining proceeds and borrowings will redeem any remaining notes.

Canonsburg, Pa.-based CONSOL Energy Inc. operates in the Appalachian Basin.