NorthWestern Energy Group, Inc. (NWE) stock intrinsic value fair value estimate & owner earnings analysis

NorthWestern Energy Group is a regulated electric and natural gas utility serving Montana (including Yellowstone National Park), South Dakota and Nebraska. Prices are set by state regulators (an allowed return on equity of 9.65% on electric and 9.60% on gas was set in Montana in December 2025), which makes revenue fairly steady but caps what owners can earn. In August 2025 the company agreed an all-stock merger with Black Hills Corporation (0.98 Black Hills shares per NorthWestern share); we value NorthWestern on its own, as it stands today. What the business earns for its owners. We measure cash from operations, remove swings in working capital (including regulatory deferrals of fuel and other costs that are collected later), deduct stock compensation, and deduct the capital spending needed to keep the system running. The company itself splits its spending into maintenance ($372.7M in 2025, $324.0M in 2024, $321.9M in 2023, $295.4M in 2022) and capacity additions ($151.8M in 2025); we use its maintenance figure. On that basis owner earnings after interest were $76M in 2025 ($1.24 per share), $97M in 2024, $47M in 2023 and $43M in 2022. Because this is a heavily borrowed business, we add back the roughly $137M of cash interest paid in 2025 to see what the business produces before its lenders are paid: $138.8M, $151.8M, $225.3M and $213.1M for 2022 to 2025. We use the median of those four years, about $182M a year, as the starting level; 2021 is excluded because the company did not disclose a maintenance split we could use. The first half of 2026 (operating cash flow $233M versus $212M a year earlier) gives no reason to move that level. Business cash flow fell 5.4% in 2025; our base case starts at $182M, which is about 14% below 2025, so it does not assume a rebound. What we credit and what we leave out. Net income has been flat since 2021 ($187M in 2021, $181M in 2025, or about $204M before a $30.9M non-cash charge) while the share count rose from 51.9M to 61.5M shares. Heavy investment has not yet produced growth per share, so the base case credits no growth. We leave out the $683M 2026 spending plan and the growth it might bring, because it depends on new financing (the company says it expects to issue equity from 2027) and on future rate decisions. We also leave out the data-center letters of intent (175 megawatts from late 2027, up to 1,100 megawatts by 2030), which are non-binding and have no signed service agreements. The utility's monopoly franchise and cost-of-service regulation are what we rely on to keep the earning power going after year 10, so the flat level continues indefinitely. What the shares appear to be worth. Debt is the deciding factor. At June 30, 2026 the company had about $3.59B of borrowings and $4M of cash. Most of the bonds are long-dated with coupons of roughly 3% to 5.75%, below our 6% rate, so we reduce the debt burden by about $0.35B to about $3.23B. Dollar figures are for the whole company; per-share figures divide by 61.5M shares. Base case: the business is worth about $3.04B (flat $182M a year), the company owes about $3.23B, leaving about negative $0.19B, or negative $3.11 per share. On these assumptions the company appears to owe slightly more than the business is worth without growth. This is not a distress signal; it reflects that all of the value shareholders hope for rests on growth we cannot yet count. Bear case: in Montana, regulators disallowed $30.9M of the Yellowstone County Generating Station's cost in the December 2025 order, cut the fuel-cost base from $208M to $119M and suspended the 90/10 cost-sharing mechanism, and the company took on Colstrip Units 3 and 4 at $0 on January 1, 2026, adding about $48M a year of operating costs ($18M Avista interests, $30M Puget interests) that are covered only by an interim waiver and a contract that ends in late 2027. In the bear case those costs are not recovered from 2028, so business cash flow falls to $130M a year, below the roughly $150M interest run-rate. The business is worth about $2.26B, the company owes about $3.23B, leaving about negative $0.97B, or negative $15.77 per share; the company would owe more than it is worth by roughly that amount. The $404M revolving credit line matures in November 2028 (with a 65% maximum debt-to-capital covenant) and $150M of short-term borrowings mature in 2026; refinancing on worse terms or new equity would be the likely consequences. Bull case: business cash flow holds at the 2025 level of $213M in year 1, then grows 3% a year for nine years as regulated asset investment beyond depreciation (about $120M a year of maintenance spending above the $250M depreciation charge) earns the allowed return, then stays flat. Support: the December 2025 order approved $123.5M of annual base-rate increases ($105.5M electric, $18.0M gas) and the company has run maintenance spending above depreciation every year we can see. The business is worth about $4.36B, the company owes about $3.23B, leaving about $1.13B, or $18.33 per share. What could make this wrong. Regulators may treat the company's spending as recoverable with a return faster than we allow (a favorable ruling on its January 2026 request for reconsideration of the Yellowstone plant disallowance would help), the Black Hills combination may change financing costs and dividend capacity, or Colstrip costs may be recovered in full. On the other side, 2025 dividends of $161M were more than twice owner earnings of $76M and were funded with borrowing and share issuance. We could not fully reconcile how much of the deferred regulatory costs ($53.7M added in 2025) will actually be recovered, and we removed them as timing. Because leverage makes the outcome swing sharply, no price is attractive at present.