Sierra Club Report Cited Iowa Utility Failures
The Sierra Club issued low marks to major Iowa utilities regarding their plans to transition away from fossil fuel power.
Updated on Sept. 23, 2026 in Utilities
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The Sierra Club released its sixth annual Dirty Truth Report on September 22, 2026, awarding failing grades to both MidAmerican Energy and Interstate Power and Light. The report evaluates major utility providers based on their progress in retiring coal plants and expanding renewable energy capacity.
Why it matters
Utilities are increasingly proposing new natural gas projects to meet the surging electricity demand from artificial intelligence data centers. This trend complicates efforts to phase out fossil fuels and transition to sustainable energy sources.
MidAmerican Energy scored three out of 100, while Interstate Power and Light received a score of zero. Nationally, the 76 utilities assessed in the report achieved an aggregate score of only seven out of 100.
The players
Sierra Club
This environmental organization focuses on promoting sustainable energy policies and challenging industrial pollution.
MidAmerican Energy
This major utility company provides electricity and natural gas services across Iowa and other states.
Interstate Power and Light
This provider operates extensive power infrastructure and currently faces scrutiny for its proposed gas-fired power plant projects.
Iowa Utilities Commission
This state regulatory body oversees the approval process for utility applications, including new power plant construction.
The details
The report criticizes the reliance on gas as a bridge fuel, noting that Interstate Power and Light has pending applications for two gas-burning plants in Linn and Cerro Gordo counties. MidAmerican Energy intends to build 2,442 MW of wind and solar alongside 1,217 MW of gas, while Interstate Power and Light plans for 1,638 MW of renewables and 3,014 MW of gas by 2035.
Timeline
The Sierra Club released the Dirty Truth Report on September 22, 2026.
Both utility companies aim to complete their planned energy capacity by 2035.
Market Landscape
The report highlights a growing tension between clean energy mandates and the urgent infrastructure requirements of the Iowa Utilities Commission's plant approval process. This shift forces utilities to balance internal green energy targets against the immediate grid stability needs created by regional growth.
Customers may see changes in local utility bills as energy providers invest in new gas and renewable infrastructure projects. Residents in Linn and Cerro Gordo counties specifically face potential developments that could impact local land use and long-term energy pricing.
The takeaway
Transitioning to a green grid requires balancing the rapid growth of AI data centers with long-term climate commitments. Investors and ratepayers should monitor utility energy applications as these plans dictate the state's environmental footprint for decades.
Further reading
Learn more about energy policy and infrastructure in our Utilities section.
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