NorthWestern Energy unit sells $400 million of 5.073% first mortgage bonds due 2030
On March 21, 2025, NorthWestern Corporation, a wholly owned subsidiary of NorthWestern Energy Group, issued and sold $400 million of Montana First Mortgage Bonds maturing March 21, 2030, in a private offering to qualified institutional buyers and non-U.S. persons. The company plans to use the proceeds to redeem its 5.01% Montana first mortgage bonds due May 1, 2025, and for capital expenditures, working capital and general corporate purposes, and the filing reports a new $400 million secured debt obligation.
Key points
- Principal of $400 million; issued March 21, 2025; matures March 21, 2030; fixed interest rate of 5.073% per year.
- Interest is paid semi-annually on March 21 and September 21, beginning September 21, 2025.
- Proceeds intended to redeem 5.01% Montana first mortgage bonds due May 1, 2025, fund capital expenditures, pay working capital needs including revolving credit facility debt, and for general corporate purposes.
- Bonds rank equally with other debt secured by the first mortgage lien; redeemable at 100% of principal plus accrued interest on or after February 21, 2030.
The filing
Written by AI on Nov 8, 2026, 1:05 AM ET, from this filing only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on March 27, 2025.
Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.