Alliant Energy (LNT) Q3 2026 earnings review
Alliant Energy raises its build plan, while tax timing lifts profit
Alliant Energy, a Midwest electric and gas utility, raised its multi-year construction plan as data center demand moves into its financial targets. Third-quarter profit per share, excluding one-offs, rose 36% on new utility rates, warm summer weather, corporate venture gains and a temporary tax benefit. Chief executive Lisa Barton raised the bottom of the 2026 profit outlook, which by our math leaves fourth-quarter profit falling about 26% as the tax timing reverses.
| Profit per share, excluding one-offs | $1.52 +36% from a year ago |
|---|---|
| Retail electric volume | 7,146k MWh +2.5% from a year ago |
| 2027–2030 construction plan | $15.9B +19% vs prior four-year plan |
| 2027 profit per share outlook | $3.63–$3.73 +8% vs original 2026 midpoint |
⚖️ Verdict: 🟢 Bullish
The story got better because the utility turned its 3.4 gigawatts of data center contracts into a 19% larger construction budget of $15.9 billion and a 2027 profit forecast of 8% growth. Extending the Iowa retail electric base rate freeze through 2030 also lowers political risk around that build. One caution: tax timing and unconsolidated investment income drove over half the third-quarter profit jump, and the bigger build widens the cash deficit.
The question now is how much of the 19% construction increase will reach per-share profit after the utility issues new stock and debt to pay for it. Either data center revenues and tax credits cover enough of the bill to keep profit per share growing near 8%, or fresh equity sales pull growth back down. The updated financing plan on the conference call and fourth-quarter utility volumes will tell.
🐂 Bull Case
Data Center Demand Lifts the Build Plan 19%
Alliant Energy runs regulated electric and gas utilities in Iowa (IPL) and Wisconsin (WPL), where it earns a set return on the power plants and lines it builds. The utility group has 3.4 gigawatts of contracted power demand from data centers, which it expects will lift peak electricity demand by about 60% by 2031, "an industry-leading growth rate".
To supply those facilities, the company raised its four-year construction plan by 19% to $15.9 billion for 2027 through 2030, and issued its first 2027 profit forecast.
- 2027–2030 construction plan: $15.9 billion, up from $13.4 billion for 2026–2029
- 2027 natural gas generation spending: $2.09 billion, up from $1.52 billion in the prior plan
- 2027 renewable and battery storage spending: $1.25 billion, up from $1.04 billion previously
- 2027 profit per share forecast, excluding one-offs: $3.63 to $3.73, up 8% from the original 2026 middle of the range
This matters because regulated utilities turn construction spending directly into rate base, the asset value on which regulators allow them to earn profit. By setting 2027 profit growth above 7% even against the raised 2026 target, management showed that new plant spending is outpacing the drag from new shares and interest costs.
What to watch: how much new equity the utility says it must sell through 2030 on the conference call. A larger share sale plan would eat into the per-share profit growth from the extra $2.5 billion of construction.
Iowa Rate Freeze Extended Through 2030
Rapid power plant construction often forces utilities to raise household electric bills, which can spark pushback from voters and regulators. Chief executive Lisa Barton addressed that concern this quarter: "We are extending IPL’s retail electric base rate stability plan by one additional year, providing Iowa retail electric customers with predictability through the end of 2030."
Despite freezing base electric rates for existing Iowa customers through 2030, the utility said IPL will continue to earn its authorized return on equity. That works because new data center customers pay under individual contracts that cover their own share of grid costs, and renewable tax credits help offset the cost of new power plants.
What to watch: the individual customer rate filing for the 900-megawatt QTS data center in Clinton, Iowa, due by year-end. Commission approval would confirm that incoming large customers keep funding the Iowa build without raising household base rates.
Utility Rate Base and Retail Volumes Accelerated
Last quarter, earnings at the core utility operations fell while parent-company venture gains carried the headline result. In the third quarter, the core electric and gas utilities rebounded as new power generation and energy storage assets entered the rate base.
- Utilities and Corporate Services profit per share: $1.58, up 40% from $1.13 a year ago
- Rate base additions to profit per share: $0.12 at WPL in Wisconsin and $0.05 at IPL in Iowa
- Retail electric sales volume: 7,146 thousand megawatt-hours, up 2.5% from a year ago
Retail electricity volume growth stepped up from 1.0% in the second quarter to 2.5% in the third, with residential volume up 5.1%, commercial up 3.0% and industrial up 1.6%. That puts electricity volume growth back on track for the company's 2% to 3% full-year target after a flat first half.
What to watch: fourth-quarter retail electric megawatt-hour sales and initial 300-megawatt power flow at the Cedar Rapids data center. A further step-up in industrial and commercial volumes will show the data center ramp has started in the reported numbers.
🐻 Bear Case
Tax Timing and Venture Gains Drove Half the Jump
Alliant Energy reported third-quarter profit per share, excluding one-offs, of $1.52, up 36% from $1.12 a year ago, and Barton highlighted "another solid quarter of operating performance". However, two non-utility or temporary items supplied more than half of that $0.40 per-share increase.
- Income tax benefit: $67 million, compared with $18 million a year ago, adding $0.19 per share by our math
- Equity income from unconsolidated investments: $45 million, up from $18 million a year ago
- Fourth-quarter profit per share implied by the full-year outlook: $0.42 to $0.47, down about 26% from $0.60 a year ago by our math
The company noted that "the income tax timing variances will reverse by the end of the year", and that results again benefited from "higher equity earnings from corporate venture investments". Because the third-quarter tax benefit reverses in the fourth quarter, the narrowed full-year plan leaves fourth-quarter profit per share falling by about a quarter from last year.
What to watch: Non-utility and Parent earnings in the fourth quarter and the full-year venture gain disclosure in the annual report. If venture marks turn negative in a later quarter, they will drag down ongoing profit per share just as they lifted it in the middle of 2026.
Bigger Build Plan Widens Cash Deficit and Debt
Building power plants ahead of customer demand requires heavy upfront cash, and Alliant Energy is funding that gap with debt and new shares. Over the first nine months of 2026, cash from operations of $909 million covered just half of the $1.81 billion spent on utility and other construction, leaving a free cash flow deficit of $897 million by our math.
Cash on the balance sheet stood at $26 million at the end of September, down from $556 million at year-end, while commercial paper and other short-term debt reached $1.10 billion. Because total debt rose to $12.56 billion, nine-month interest expense climbed 16% to $430 million. Raising the 2027–2030 construction plan by $2.5 billion will require still more external funding.
What to watch: fourth-quarter long-term debt issuances and forward equity settlements against the $1.05 billion of fourth-quarter construction implied by the 2026 plan. Rising interest expense and share count will test how much of the 2027 rate base growth reaches shareholders.
Risks this quarter didn't answer
Several standing risks around the data center build-out received no new figures in the third-quarter earnings release and await the conference call or quarterly filing.
- Contracted data center total: unchanged at 3.4 gigawatts for a second straight quarter; any new signed agreement would test whether the pipeline is still converting.
- Project cost and contract protections: no figures on generation cost per kilowatt or minimum-take guarantees if a data center customer delays construction.
- Regulatory approvals for new gas plants: decisions on the 720-megawatt Linn County and 1,200-megawatt Riverhawk natural gas plants remain pending for early 2027.
- Local political pushback: state election cycles and local data center ordinances in Iowa and Wisconsin remain open risks to siting and timelines.
👓 Other Themes
Summer Weather Added Five Cents to Profit
Warm third-quarter temperatures lifted cooling demand in both Iowa and Wisconsin, adding $20 million to electric operating income and $0.05 per share to third-quarter profit, compared with $10 million and $0.03 per share a year earlier. That summer boost nearly offset a mild first half, leaving weather as a $7 million drag on operating income for the first nine months of 2026.
💲 Other KPIs
Operating margin rose 1.4 percentage points from 28.8% a year ago as revenue grew 6.2% to $1,285 million. Electric fuel and purchased power—the cost of generating and buying electricity—fell 2.5 percentage points of revenue, more than offsetting a 0.9-point rise in operating and maintenance expenses for labor and planned maintenance.
Weighted average diluted shares rose 1.2% from 257.8 million a year ago, continuing a steady climb from 258.8 million in the first quarter and 260.9 million in the second quarter. The utility issues new shares through forward sale contracts and its dividend reinvestment plan to help fund power plant construction.
Net utility plant and equipment grew 6.2%, or $1.26 billion, from $20.34 billion at the end of 2025, following $21.06 billion at the end of the second quarter. This growing asset base drives the higher authorized customer rates that added $0.17 per share to utility profit in the third quarter.
🔮 Guidance
Raised. The company lifted the bottom of the range by $0.05 after holding $3.36 to $3.46 for four straight quarters, putting the middle of the range up 6.7% from 2025. By our math, that leaves $0.42 to $0.47 for the fourth quarter, down about 26% from $0.60 a year ago as third-quarter tax timing reverses. The plan assumes a negative 28% effective tax rate, compared with negative 35% previously.
Raised. Alliant Energy replaced its earlier 5% to 7%+ annual growth target with a formal 2027 range whose $3.68 midpoint is up 7.9% from the original 2026 midpoint and 7.1% from the narrowed 2026 midpoint. The forecast rests on utilities earning their authorized returns, hitting construction dates, and collecting expected revenue from new data center demand.
New. The 2027 dividend target of $2.25 per share is up 5.1% from the 2026 target of $2.14 per share. That is slightly slower than the 5.4% dividend increase in 2026 and sits below the 7.1% expected profit per share growth, keeping more cash inside the business during the peak construction years.
Raised. Management trimmed the 2026 construction forecast to $2.86 billion from about $3.0 billion, which by our math leaves $1.05 billion to spend in the fourth quarter. At the same time, it lifted the four-year 2027–2030 budget by 19% to $15.94 billion, peaking at $4.74 billion in 2028 on gas, wind and battery projects.
❓ Key Questions
How much new equity will the $15.9B plan require?
The utility increased its four-year construction budget by $2.5 billion to $15.9 billion, but the release did not update the prior $2.4 billion equity issuance plan. Investors need to know how much additional stock the company will sell through 2030.
How much did venture gains add in Q3?
Equity income from unconsolidated investments jumped by $27 million to $45 million in the third quarter, and the company cited corporate venture investments as a driver. Management has not separated the one-off venture marks from recurring transmission earnings in the release.
Why did the 2026 tax rate assumption change?
The 2026 profit outlook now assumes a consolidated effective tax rate of negative 28%, compared with negative 35% in the second quarter. Management did not explain whether the shift comes from higher pre-tax income or fewer renewable tax credits.
Did data centers drive the Q3 retail volume pickup?
Retail electric sales volume grew 2.5% from a year ago, up from 1.0% in the second quarter, with residential volume up 5.1% and commercial up 3.0%. The release does not state how many megawatt-hours came from data centers versus warm summer weather.