Iowa Electricity Rates

Iowa generates 64% of its electricity from wind—the highest percentage of any state in the United States. More than 6,000 turbines dot the Iowa landscape from the Missouri River bluffs to the Mississippi corridor, harnessing the persistent prairie winds that sweep across the Great Plains. With 12,200+ MW of installed wind capacity, Iowa ranks second in the nation in total wind generation behind only Texas—but leads every state by a wide margin in the share of electricity that comes from wind.

Iowa’s wind dominance didn’t happen by accident. In 1983, Iowa became the first state in America to adopt a renewable portfolio standard—before any other state, before “renewable energy” was a mainstream political topic, and decades before the modern wind industry took shape. That early policy framework, combined with the flat terrain of the Iowa prairie creating ideal wind conditions, set the stage for what would become a multi-billion-dollar transformation of the state’s energy landscape.

MidAmerican Energy, Iowa’s largest utility and a subsidiary of Warren Buffett’s Berkshire Hathaway, has been the single largest driver of Iowa’s wind buildout, investing over $12 billion in Iowa wind farms. The company’s “Wind PRIME” project alone added 2,042 MW of new wind capacity across multiple Iowa counties. Federal Production Tax Credits (PTCs) made these investments extraordinarily profitable, and MidAmerican became one of the largest PTC beneficiaries in the country.

Wind has transformed rural Iowa in ways that extend far beyond the grid. Farmers receive land lease payments of $5,000–$15,000 per turbine per year while continuing to farm around the towers. Counties collect property tax revenue from wind installations that funds schools, roads, and local services. Construction and permanent maintenance jobs support communities across rural Iowa that had seen decades of population decline.

Iowa’s electricity market is dominated by two major investor-owned utilities—MidAmerican Energy and Alliant Energy—supplemented by one of the strongest municipal and cooperative utility networks in the country. Together, approximately 130 municipal utilities and 40 rural electric cooperatives serve Iowa communities alongside the IOUs.

No discussion of Iowa electricity is complete without the Warren Buffett angle. MidAmerican Energy—Iowa’s largest utility, serving 51% of the state—is owned by Berkshire Hathaway Energy, a subsidiary of Buffett’s Berkshire Hathaway conglomerate. And Buffett has called Iowa wind one of his best investments.

The investment thesis is elegant in its simplicity: massive upfront capital deployed into wind farms generates electricity at essentially zero marginal cost for decades. Unlike coal or gas plants, wind turbines don’t burn fuel—once built, the operating cost is maintenance and the “fuel” is free. For a regulated utility earning a guaranteed rate of return on capital invested, wind represents the ideal asset: capital-intensive to build (maximizing rate base), cheap to operate (keeping rates competitive), and eligible for federal tax benefits.

Federal Production Tax Credits (PTCs) supercharged the economics. For every kilowatt-hour of wind electricity generated, MidAmerican received a tax credit worth roughly 2.5¢. Applied across billions of kWh of annual wind generation, these credits were worth hundreds of millions per year to Berkshire Hathaway. At one point, Berkshire was one of the single largest beneficiaries of Production Tax Credits in the entire United States.

MidAmerican has leveraged this model to offer something nearly unique in the American utility industry: “100% renewable energy” to all customers in its Iowa territory at no additional cost. The company generates enough wind electricity to match 100% of its Iowa retail sales on an annual basis. For customers, this means being served by one of the greenest utilities in America without paying a green premium.

The company has committed to zero-coal generation—wind replaces everything. MidAmerican’s remaining coal units are being retired and replaced with additional wind and solar, extending the same playbook that has generated strong returns for Berkshire shareholders while delivering competitive rates and clean power to Iowa customers.

Iowa’s energy story took a dramatic turn in August 2020 when the Duane Arnold Energy Center—the state’s only nuclear power plant—closed permanently. Located near Cedar Rapids in Alliant Energy’s service territory, Duane Arnold had been generating carbon-free baseload power since 1975, providing 5–6% of Iowa’s total electricity generation.

The closure was accelerated by a powerful derecho—an intense, fast-moving inland windstorm—that tore across Iowa on August 10, 2020, with winds exceeding 140 mph. The derecho caused significant damage to the Duane Arnold facility and its infrastructure. Owner NextEra Energy evaluated the repair costs and made a business decision: rather than invest in restoring a plant already scheduled for retirement in 2025, they shut it down permanently.

The loss of Duane Arnold removed Iowa’s only source of nuclear generation overnight. But Iowa’s response was telling: rather than replacing nuclear with natural gas (as many states have done), Iowa doubled down on wind. Additional wind capacity was brought online to fill the gap, and Iowa’s wind percentage actually increased after the nuclear shutdown.

This makes Iowa’s grid one of the most wind-dependent in the world—a remarkable achievement, but one that raises a practical question: what happens when the wind doesn’t blow?

Iowa manages wind variability through its participation in the Midcontinent Independent System Operator (MISO), a regional transmission organization that coordinates electricity across 15 U.S. states and the Canadian province of Manitoba. When Iowa’s wind output drops during calm periods, the state imports power from MISO neighbors with gas, coal, or nuclear generation. When Iowa’s turbines are spinning hard, the state exports surplus wind power across the grid. This interconnection is what makes 64% wind penetration operationally feasible—Iowa doesn’t need to be self-sufficient every hour of every day.

Natural gas (15%) and coal (10%) provide dispatchable backup generation within Iowa, with a small but growing solar contribution (2%) and other sources (4%) including hydroelectric and biomass rounding out the mix. Nuclear now stands at 0% following Duane Arnold’s closure.

Iowa has not pursued retail electricity deregulation. The state’s electricity market remains fully regulated, with the Iowa Utilities Board (IUB) overseeing rate-setting and service standards for MidAmerican Energy, Alliant Energy, and other investor-owned utilities.

Iowa was actually one of the states that considered deregulation in the late 1990s, when a wave of restructuring enthusiasm swept through state legislatures across the country. Several proposals were floated in the Iowa General Assembly to open the electricity market to retail competition. But Iowa never enacted deregulation legislation—and the California energy crisis of 2000–2001, with its rolling blackouts and price manipulation by Enron and other traders, killed political momentum nationwide. Iowa legislators looked at California’s disaster and shelved the idea.

In the years since, the case for Iowa deregulation has only weakened. MidAmerican Energy’s massive wind investment has kept rates competitive and declining in real terms, and the utility’s “100% renewable” option gives environmentally conscious customers what they want without requiring a competitive market. Berkshire Hathaway’s ownership provides financial stability that makes the typical deregulation argument—“competition will lower prices”—harder to sell when the regulated monopoly is already delivering affordable, clean power.

Alliant Energy’s rates are also competitive, and Iowa’s strong municipal and cooperative utility networks give communities local control over their electricity systems without needing a deregulated market. When municipal utilities already offer some of the lowest rates in the state, and when the dominant IOU is backed by one of the richest companies in the world and invests billions in clean energy, the political appetite for deregulation simply isn’t there.

Iowa’s commercial electricity rate of 13.3¢/kWh is competitive nationally and reflects the state’s abundant low-cost wind generation. For Iowa’s dominant industries—agriculture, food processing, manufacturing, insurance, and a growing data center sector—reliable, affordable electricity is a critical competitive advantage.

Iowa’s below-average rates give Iowans a head start, but there are still meaningful opportunities to reduce electricity costs—especially given the state’s extreme seasonal temperature swings from brutal winters to hot, humid summers.