The Duane Arnold (nuclear) Energy Center

For decades, the Duane Arnold Energy Center operated quietly along Iowa’s Cedar River, providing steady electricity to the region. The reactor began commercial operation in 1975 and achieved a lifetime capacity factor of 78% (far below the 95% nuke bros love to use). As Iowa’s only nuclear power plant, it supplied dependable baseload power through oil crises, economic recessions, and decades of changing energy policy.

Wind Power Changed the Economics

By the 2010s, Iowa had become a national leader in wind generation. Larger turbines, federal incentives, and falling construction costs drove renewable electricity prices sharply downward.

In 2018, NextEra Energy Resources and Alliant Energy reached an agreement to cancel the nuclear power purchase contract. Alliant chose to pay $110 million to cancel the agreement five years early, shifting its energy strategy toward expanding wind generation and purchasing lower-cost electricity from renewable sources.

The company projected the decision would save customers roughly $300 million over time.

For the nuclear plant, however, the lost contract meant lost revenue. Even though the reactor remained licensed and capable of operating safely, it could no longer compete economically in a market increasingly shaped by inexpensive wind power.

From Nuclear Power to Pleasant Creek Solar

After closure, the site entered a new phase. Portions of the property surrounding the former reactor were redeveloped into a large solar installation known as Pleasant Creek Solar, transforming land once dedicated to nuclear generation into another form of renewable energy production.

The transition symbolized a broader shift underway across the Midwest: from centralized, mostly-on generation toward networks of wind and solar resources supported by modern grids.

The story of the Duane Arnold Energy Center is therefore not one of technological failure. The plant operated successfully for decades. Instead, it reflects how changing energy economics — particularly the rapid rise of wind power in Iowa — reshaped decisions about which sources of electricity would power the future.

Where a nuclear reactor once defined Iowa’s energy landscape, turbines and solar panels now carry forward the same goal: producing electricity without carbon emissions, but through a new generation of technologies

Yet another woefully under forecast. Just looking at global new BESS manufacturing coming online by 2028. We should hit over 300GW/yr by 2030.

TL;DR from the article:

• EU battery fleet grew tenfold since 2021, now at 77 GWh
• Grid-scale costs dropped 45% in 2025 alone
• Germany leads at 2.8 GW, Italy second at 2 GW
• France near the bottom despite doubling capacity
• Bulgaria was the surprise breakout market

The 45% cost drop in a single year is striking. Germany and Italy leading makes sense, but France sitting near the bottom is the interesting part given how much flexibility their grid will need as solar keeps growing.