Data centers can power Alliant, if projects land
- Alliant serves electric and gas customers through its Iowa and Wisconsin utilities.
- The main growth story is about 3.4 GW of contracted data center demand.
- A 720 MW Iowa gas plant filing and approval for up to 1,000 MW of new wind make the plan more concrete.
- The company targets 5-7% long-term EPS growth, but its valuation and balance sheet leave less room for mistakes.
- The key watch item is whether regulators approve projects fast enough for customer load ramps.
Data center load meets utility execution
Alliant has a simple story with hard execution behind it. The company has about 3.4 GW of contracted data center demand, which management says is more than a 60% increase in current peak demand. That gives Alliant a clearer need to build power plants, wires, and related assets.
The latest filings made the plan easier to judge. IPL filed for an approximately 720 MW simple-cycle natural gas plant in Linn County, Iowa. The Iowa regulator also approved advance rate-making principles for up to 1,000 MW of new wind generation. Rate-making means the rules that decide how a utility can recover costs from customers.
The bull case is that this load growth supports Alliant's 5-7% long-term EPS growth target. Iowa is the center of the story because it has better land availability, transmission access, and gas access inside Alliant's service area. If projects move on time, the company can grow its rate base, which is the pool of assets regulators allow it to earn a return on.
The bear case is not that demand is missing. It is that Alliant must build a lot, fund a lot, and win approvals on time. The stock also does not look cheap in Finn's scoring, and financial health is a weak spot. That means even a good growth story needs clean execution.
Paid to build and serve load
Alliant is a regulated utility holding company. It earns money by selling electricity and natural gas in Iowa and Wisconsin, then earning allowed returns on approved utility investments. Most of the business is steady, because customers need power and heat in normal times.
The growth model is changing. New hyperscale data centers need huge amounts of electricity, and Alliant now has five executed data center agreements representing about 3.4 GW of contracted demand. To serve that load, it plans to add flexible generation, including simple-cycle gas plants, batteries, wind, and solar.
Simple-cycle gas plants are quicker-to-build power plants that can start fast when the grid needs capacity. That matters because data center customers have strict timelines. Iowa's strong wind resources help with energy supply, while gas plants and batteries help with reliability.
The model can break if costs rise, projects slip, or regulators reject the timing and cost recovery. Mild weather can also hurt earnings by lowering energy use, as it did in 2024 with a $0.15 per share headwind compared with normal weather.
Power, gas, and new capacity
Electric utility service
Electric service is the core business. It serves retail and wholesale customers and is where data center demand creates the biggest growth need.
Natural gas utility service
Gas service adds a more traditional utility revenue stream in Iowa and Wisconsin. Demand can swing with winter weather.
Data center electric service agreements
Alliant has five executed agreements totaling about 3.4 GW of contracted demand. A new 370 MW Iowa agreement signed in April 2026 added to that base.
Wind and solar generation
The company completed about 1.5 GW of solar projects in 2024 and has approval for advance rate-making principles for up to 1,000 MW of new Iowa wind. These assets support the cleaner energy shift.
Simple-cycle natural gas generation
IPL filed for an approximately 720 MW simple-cycle gas plant in Linn County, Iowa. These plants are built for speed and grid reliability, not constant power output.
Coal generation retirement plan
Alliant continues to phase out coal-fired generation. The shift can lower emissions over time, but it also requires replacement capacity that works when customers need power.
Two state utilities
Mix uses Q1 2026 subsidiary revenue from the 10-Q: IPL at $561 million and WPL at $600 million. Shares are normalized to the two main utility subsidiaries, since non-utility revenue was small.
What could break the plan
Iowa gas plant delay
High impact · Medium oddsIPL needs approval for the approximately 720 MW Linn County simple-cycle gas plant. A delay could make it harder to match power supply with data center timelines. It would also raise questions about whether extra capacity must be filed later.
Large load does not ramp as planned
High impact · Medium oddsThe growth case depends on data center customers taking power on schedule. Alliant has about 3.4 GW of contracted demand, but contracts still need construction, interconnection, and customer buildout to turn into actual load. Any slowdown would weaken the capital plan story.
Capital plan funding pressure
High impact · Medium oddsBuilding new generation and grid assets takes a lot of money. Management previously said incremental capital spending could be funded with roughly 40% to 50% new common equity. That can dilute shareholders if the stock price is weak or project needs grow.
Weather earnings hit
Medium impact · Medium oddsAlliant is sensitive to temperatures because heating and cooling drive energy use. In 2024, mild temperatures created a $0.15 per share earnings headwind versus normal weather. A repeat could offset some of the growth from new load.
IRA tax credit changes
Medium impact · Medium oddsRenewable and storage project economics depend partly on tax credits. Management has warned that removing credits would increase customer costs. Alliant has safe-harbored 100% of renewable and energy storage capital spending in its plan through 2028, which helps but does not remove policy risk.
MISO capacity rule changes
Medium impact · Medium oddsManagement has referenced MISO accreditation changes, but the net impact on capacity needs is still an open question. Accreditation decides how much reliability credit each power resource gets. If credits fall, Alliant may need more capacity than investors expect.
In one breath
Why are data centers important for Alliant Energy?
Data centers use very large amounts of electricity. Alliant says its about 3.4 GW of contracted data center demand equals more than a 60% increase in current peak demand, which supports a larger utility investment plan.
Is Alliant Energy mainly an Iowa company or a Wisconsin company?
It serves both states through IPL in Iowa and WPL in Wisconsin. The newest large data center growth is more concentrated in Iowa because management points to better land, transmission, and gas access there.
Why is Alliant building gas plants if it is adding wind and solar?
Wind and solar provide clean energy, but data centers also need reliable capacity when the grid is tight. Simple-cycle gas plants and batteries can come online faster and help cover peak demand.
What is the main investor concern with LNT?
The demand story is clearer than before, but the company must still build, finance, and win approval for many projects. Finn's weaker valuation and financial health scores mean the market already gives Alliant limited room for mistakes.