Funds managed by subsidiaries of the energy-focused investment firms Triloma Financial Group and EIG Global Energy Partners have committed $300 million to Northeast Natural Energy LLC.

The private company issued a senior secured first lien note to the firms. Triloma and EIG said the floating rate notes mature in five years and are secured by mortgages on the company’s proved reserves and other assets.

Established in 2009, Northeast Natural has 49,000 net acres located in the Marcellus Shale fairway of West Virginia and western Pennsylvania. It operates 27 Marcellus wells and more than 100 conventional oil and gas wells in the Appalachian Basin.

The Charleston, WV-based producer is perhaps best known for its partnership in the Marcellus Shale Energy and Environmental Laboratory. Two years ago, Northeast Natural drilled an observation well and two production wells at an industrial park in Morgantown, WV, where researchers are monitoring the process of unconventional natural gas production. The U.S. Department of Energy, Ohio State University and West Virginia University are also partners in the lab.

In separate news, Rex Energy Corp. said Monday that it has entered a new $300 million borrowing base with a lending group led by Angelo, Gordon & Co. The company closed the agreement for a first lien delayed draw term loan that extends maturity to April 2021.

Rex said the additional liquidity would ultimately go toward executing its two-year development plan in the Appalachian Basin, which it announced in January. The company has already borrowed $144 million under the new term loan to repay outstanding debts under its previous $190 million borrowing base and place more money on its balance sheet, among other things. The new borrowing base also provides up to an additional $100 million for reserve development and acquisitions.