NorthWestern Energy (NWE) Q3 2026 earnings review
NorthWestern Energy sales rise, but coal plant costs cut profit
NorthWestern Energy, an electric and gas utility serving Montana, South Dakota and Nebraska, saw profit fall as costs from newly acquired coal units outweighed higher sales. Third-quarter revenue rose 10% from a year ago, but profit per share excluding one-offs dropped 27% to $0.58 because regional power prices were too low to cover $11.5 million of maintenance at its expanded Colstrip plant stake. Finance chief Crystal Lail kept the full-year outlook intact while steering expectations to the lower half of the range, which by our math still requires at least 10% profit growth in the fourth quarter.
| Revenue | $423.8M +9.5% from a year ago |
|---|---|
| Profit per share, excluding one-offs | $0.58 -26.6% from a year ago |
| 2027 data center pipeline under agreement | 75 MW cut from 150 MW after Sabey exit |
| 2026 profit per share outlook | Held ($3.68–3.83) now guided to lower half of range |
⚖️ Verdict: 🔴 Bearish
The standalone story got worse because unrecovered Colstrip plant bills are dragging down earnings, Sabey Data Centers cancelled its Montana development agreement, and the estimated cost of the utility's planned South Dakota gas plant jumped 57% to $470 million. On the other side, the all-stock merger with Black Hills Corporation is days away from its final regulatory hurdle, with chief executive Brian Bird expecting a Montana ruling by November 12.
The question now is whether the utility closes the Black Hills merger and signs a binding contract with remaining data center developer Quantica before year-end. Supporters see the doubling of the utility's scale and a year-end Quantica contract as enough to outweigh near-term cost drags, while skeptics point to four quarters of delayed data center contracts and $48 million of annual Colstrip costs still outside customer rates. The Montana merger order due by November 12 and year-end contract filings will settle both debates.
🐂 Bull Case
Black Hills Merger Reaches Its Final Week
NorthWestern Energy, an electric and natural gas utility serving Montana, South Dakota and Nebraska, agreed in August 2025 to an all-stock merger with neighbour Black Hills Corporation. The combined utility will take the name Bright Horizon Energy and double each company's regulated asset base to about $12 billion. Shareholders, federal energy and antitrust regulators, and state commissions in Nebraska and South Dakota had already approved the deal by June.
Only the Montana Public Service Commission (MPSC), the state utility regulator, has yet to rule. Chief executive Brian Bird said the MPSC will hold a hearing on November 10 and is expected to consider the merger before November 12, 2026. To prepare for an immediate close, the board moved its quarterly dividend record date forward by nearly a month to November 17 to match Black Hills' schedule.
What to watch: the Montana regulator's written order by November 12. An approval without harsh conditions clears the transaction to close before the November 17 dividend cutoff and lifts the long-term annual earnings growth target from 4%–6% to 5%–7%.
South Dakota Wildfire Plan Completes Legal Shield
Wildfire lawsuits have become a major financial threat for Western electric utilities. After Montana passed a law protecting utilities from automatic wildfire liability in 2025, South Dakota enacted Senate Bill 36 in March 2026. The law "precludes common law strict liability claims for utility operations alleged to have caused wildfire-related damages" and restricts punitive damages to cases of proven willful misconduct, provided the utility maintains a current safety plan.
NorthWestern filed its wildfire mitigation plan with the South Dakota Public Utilities Commission in July 2026, and the regulator published it, completing the legal requirement. Both of the group's electric states now give it a formal legal presumption that an active safety plan represents reasonable care.
What to watch: future state rate reviews in Montana and South Dakota. Those proceedings will show how quickly regulators allow the utility to recover rising wildfire prevention expenses, which reduced pre-tax profit by $5.0 million over the first nine months of 2026.
Positives this quarter didn't test
Two longer-term growth drivers in the utility's pipeline had no contractual milestones scheduled for the third quarter.
- Regional power lines: the nonbinding agreement to own 10% (300 megawatts) of the North Plains Connector grid link and a letter of intent for a southwest Montana corridor remain in early permitting, with an investment decision due only after permits arrive ahead of 2028 construction.
- Early-stage data center inquiries: the combined count of initial power requests and high-level assessments rose from 14 to 16 as interest grew in South Dakota, though Bird noted these carry no financial deposits until they reach a formal development agreement.
🐻 Bear Case
Colstrip Plant Costs Cut Third-Quarter Profit
"Although the costs associated with our incremental ownership in Colstrip have created a temporary earnings headwind, this strategic decision helps ensure reliable energy for our customers," Bird said. On January 1, 2026, NorthWestern took over an extra 592 megawatts of the Colstrip coal plant in Montana from utilities Avista and Puget Sound Energy for zero purchase price, raising its stake from 15% to 55%.
While the price was zero, the operating bills are not in customer base rates. Operating and maintenance expense — the cost of running and repairing power plants and lines — jumped 32.4% from a year ago, rising 3.5 percentage points to 20.0% of revenue. Power prices in the Pacific Northwest were "insufficient to contribute to the recovery of the operating and maintenance expenses associated with the Avista Interests" under a temporary regulatory waiver.
- Colstrip plant maintenance added: $11.5 million in Q3 ($31.8 million over nine months)
- Colstrip net loss in Q3: $6.1 million, or $0.10 per share ($0.05 even after the company's own adjustments)
- Profit per share excluding one-offs: $0.58, down 26.6% from $0.79 a year ago
- Pending regulatory items: $30.9 million Yellowstone plant disallowance appeal undecided; two Montana commissioners' federal court appeal against Puget contract rates paused until December 11
What to watch: finance chief Crystal Lail's plan to "file a rate review in Montana by the end of 26" to put the Avista share into customer base rates. Until the MPSC approves that future case, low regional power prices leave shareholders carrying the unrecovered plant expenses.
Sabey Exit Cuts Data Center Pipeline
NorthWestern pitches data centers in Montana as an opportunity to lift annual profit growth above its 4%–6% target, and supporters view its early development agreements and excess coal power as a valuable growth option. To turn that option into revenue, developers must sign binding Electric Service Agreements (ESAs), which are firm long-term contracts to buy power.
After four quarters of pushed-back contract deadlines, the pipeline shrank this quarter. "Our previously disclosed development agreement with Sabey Data Centers has been terminated," the utility reported, after Sabey ran into land issues near Butte, Montana. Furthermore, Bird said the remaining Atlas Power deal is now unlikely to be signed by year-end, leaving Quantica Infrastructure as the sole candidate for a 2026 contract.
- Expected 2027 initial data center load: cut in half to 75 megawatts, down from 150 megawatts last quarter
- Projected 2030 data center load: reduced to 1,250 megawatts, down from 1,500 megawatts
- Binding ESAs signed to date: zero, with Montana's Large New Load tariff rule still without a hearing date
What to watch: whether NorthWestern signs a binding ESA with Quantica by December 31, 2026. Because the Montana regulator has not scheduled hearings on the large-load tariff, Bird said any year-end contract would have to use unregulated Colstrip power first before moving into regulated rates later.
South Dakota Power Plant Cost Jumps 57%
To meet tighter regional grid reliability rules by 2030, NorthWestern proposed building a 131-megawatt natural gas power plant in Aberdeen, South Dakota, now named the Hub City Energy Park. Through last quarter, the utility estimated the plant's cost at roughly $300 million and said it would issue new shares starting in 2027 to help pay for it.
In the third-quarter report, the company wrote: "Anticipated costs for this project are approximately $470.0 million." That is a 57% jump by our math, even as the utility left its headline $3.2 billion five-year capital budget unchanged until an update in early 2027. Meanwhile, debt to total capitalization edged up again and sits just above management's 50%–55% target band.
What to watch: the 2027 capital budget and financing update in February. A $170 million higher price tag for the South Dakota plant will require either larger 2027 stock issuances or cuts to other grid projects to keep cash flow above 14% of debt.
👓 Other Themes
Summer Weather Offered Brief Relief After Warm Winter
Weather swings drive retail electricity and gas usage across NorthWestern's northern territory. After Montana's warmest winter in over a century cut pre-tax profit by $15.3 million in the first half of 2026, hot July weather gave the third quarter a $1.1 million pre-tax boost against normal temperatures and a $4.6 million lift compared with last year. Over nine months, mild weather still cost $0.17 per share.
💲 Other KPIs
Utility margin — revenue minus fuel, purchased power and direct transmission costs — rose 5.5% from a year ago, slowing from 13.2% growth in the second quarter and 7.2% in the first. Growth slowed because the company lapped the Montana base-rate increase that took effect in late May 2025.
Available cash plus unused credit lines grew 33.3% from $262.2 million a year ago and rose from $339.2 million last quarter. In August, the utility exercised expansion options on its two revolving credit facilities, adding $125.0 million of borrowing capacity without changing interest rates or maturity dates before repaying $45.0 million of maturing South Dakota bonds.
Cash generated from operations over the first nine months rose $25.8 million, or 7.6% from $338.3 million a year ago by our math, slowing from 10.2% growth at mid-year. Collecting previously under-billed energy supply costs from customers brought in $10.0 million of cash this year versus a $20.7 million outflow a year ago, while cash flow before working capital edged up just $1.8 million.
🔮 Guidance
Unchanged, but Lail guided "with a bias towards the lower half of the range" because low Pacific Northwest power prices failed to cover Colstrip expenses. At the middle of the range, the plan calls for 4.9% full-year growth. By our math, after $2.39 over nine months, hitting the midpoint requires $1.37 in Q4 (+16.7% from a year ago), and even the $3.68 floor requires 10.3% Q4 growth.
Unchanged. The group kept its record $683 million capital budget for 2026 and its $3.2 billion five-year spending plan for 2026–2030. Lail said management will refresh the multi-year capital plan in early 2027, which will show how the $170 million cost increase on the Aberdeen, South Dakota gas plant reshapes future spending.
Unchanged. The third-quarter effective tax rate fell to 13.2% from 18.7% a year ago because of larger tax deductions for equipment repairs and lower non-deductible merger bills. That brought the nine-month tax rate to 15.5% by our math, right near the 16% middle of the full-year plan.
Unchanged. Third-quarter diluted shares averaged 61.80 million, matching the full-year assumption. Management continues to plan no common stock sales in 2026, with new share issuances scheduled to begin in 2027 to help pay for the South Dakota power plant.
Unchanged on a standalone basis from the 2024 baseline of $3.40 per share and $5.38 billion of regulated assets. Once the Black Hills merger closes, this standalone target ceases to apply and the combined company targets 5%–7% annual profit per share growth.
❓ Key Questions
Why did the Aberdeen gas plant cost jump $170 million?
The estimated cost for the 131-megawatt Hub City Energy Park rose from $300 million in Q2 to $470 million in Q3. Investors need to know whether turbine prices, labor or scope drove the 57% increase and how much extra 2027 equity it requires.
What happens if the Ninth Circuit overturns Puget's Colstrip rates?
Two Montana commissioners appealed the federal approval of rates for the 370-megawatt Puget Colstrip share, with the case paused until December 11, 2026. Management has not explained the financial exposure if the court remands the order that offsets $30 million of annual costs.
How do Montana merger commitments affect the late-2026 rate filing?
Lail plans to file a Montana rate review by year-end 2026 to put the Avista Colstrip costs into customer rates. Management has not detailed whether the April 2026 Montana merger settlement restricts when that rate hike can take effect.
Who pays for power lines under an unregulated Quantica contract?
Bird wants to sign a binding contract with data center developer Quantica by year-end using unregulated Colstrip capacity while the state tariff is pending. It remains unclear how much grid investment enters regulated rates under an unregulated supply deal.