NorthWestern Energy on Dec. 12 entered a third amendment and restatement of its existing revolving credit facility to extend the maturity date to Dec. 12, 2021, from Nov. 5, 2018, according to a Form 8-K filed on Dec. 16.

The company said the amended facility increases the capacity of the existing credit facility to $400 million, maintains an uncommitted accordion feature that allows NorthWestern to ask lenders to provide $50 million in additional capacity, keeps the margins associated with the interest rates under the amended facility and maintains the commitment fee in respect of unused commitments.

Borrowings under the amended facility may be made at interest rates equal to the eurodollar rate plus a margin of 87.5 to 175 basis points, or a base rate plus a margin of 0 to 75 basis points. Interest rates, commitment fees and letter-of-credit fees are based on the company's then-current senior unsecured credit ratings.

Under the amended facility, Merrill Lynch Pierce Fenner & Smith Inc. and Credit Suisse Securities (USA) LLC acted as joint lead arrangers; Credit Suisse Securities (USA) LLC as syndication agent; Keybank NA, MUFG Union Bank NA and U.S. Bank NA as co-documentation agents; and Bank of America NA as administrative agent.

NorthWestern is legally known as NorthWestern Corp.