In Michigan and Wisconsin, cities are finding rooftops alone may not achieve solar energy goals

A new contract between Kalamazoo, Michigan, and utility Consumers Energy signals a change in direction for the city’s clean energy strategy as it seeks to become carbon neutral by 2040.

Solar was seen as a pillar of the city’s plans when it declared a climate emergency in 2019 and set a goal of zeroing out carbon emissions by 2040. After spending years exploring its options, though, the Michigan city is tempering a vision for rooftop solar in favor of large, more distant solar projects built and owned by the utility. It’s not alone either, with Grand Rapids, Milwaukee, Muskegon and other cities taking a similar approach.

“Folks want to see solar panels on parking lots and buildings, but there’s no way as a city we can accomplish our net-zero buildings just putting solar panels on a roof,” said Justin Gish, Kalamazoo’s sustainability planner. “Working with the utility seemed to make the most sense.”

Initially there was skepticism, Gish said — “environmentalists tend to not trust utilities and large corporate entities” — but the math just didn’t work out for going it alone with rooftop solar.

The city’s largest power user, the wastewater treatment pumping station, has a roof of only 225 square feet. Kalamazoo’s largest city-owned roof, at the public service station, is 26,000 square feet. Spending an estimated $750,000 to cover that with solar would only provide 14% of the power the city uses annually — a financial “non-starter,” he said.

So the city decided to partner with Consumers Energy, joining a solar subscription program wherein Kalamazoo will tell Consumers how much solar energy it wants, starting in 2028, and the utility will use funds from its subscription fee to construct new solar farms, like a 250 MW project Consumers is building in Muskegon.

Under the 20-year contract, Kalamazoo will pay a set rate of 15.8 cents per kWh — 6.4 cents more than what it currently pays — for 43 million kWh of solar power per year. If electricity market rates rise, the city will save money, and Kalamazoo receives Renewable Energy Credits (RECs) to help meet its energy goals.

The subscription is expected to eliminate about 80% of Kalamazoo’s emissions from electricity, Gish said. The electricity used to power streetlights and traffic signals couldn’t be covered since it is not metered. As the city acquires more electric vehicles — it currently has two — electricity demand may increase, but city leaders hope to offset any increases by improving energy efficiency of city buildings.  

Consumers Energy spokesperson Matt Johnson said the company relies “in part” on funds from customers specifically to build solar, and considers it a better deal for cities than building it themselves, “which would be more costly for them, and they have to do their own maintenance.”  

“We can do it in a more cost-effective way, we maintain it, they’re helping us fund it and do it in the right way, and those benefits get passed on to arguably everybody,” Johnson said.

Grand Rapids, Michigan, joined the subscription program at the same time as Kalamazoo. Corporate customers including 7-Eleven, Walmart and General Motors are part of the same Consumers Energy solar subscription program, as is the state of Michigan.

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Costs and benefits

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“There’s a growing movement of cities trying to figure out solar — ‘Yes we want to do this, it could save us money over time, but the cost is prohibitive,’” said John Farrell, co-director of the Institute for Local Self-Reliance.

Until the Inflation Reduction Act, cities couldn’t directly access federal tax credits. The direct-pay incentives under the IRA have simplified financing, Farrell said, but cities still face other financial and logistical barriers, such as whether they have sufficient rooftop space.  

Advocates acknowledge deals with utilities may be the most practical way for budget-strapped cities to move the needle on clean energy, but they emphasize that cities should also strive to develop their own solar, and question whether utilities should charge more for clean power that is increasingly a cheaper option than fossil fuels.

“Our position is rooftop and distributed generation is best — it’s best for the customers, in this case the cities; it’s best for the grid, because you’re putting those resources directly on the grid where it’s needed most; and it’s best for the planet because it can deploy a lot faster,” said John Delurey, Midwest deputy director of the advocacy group Vote Solar. “I believe customers in general and perhaps cities in particular should exhaust all resources and opportunities for distributed generation before they start to explore utility-scale resources. It’s the lowest hanging fruit and very likely to provide the most bang for their buck.”

Utility-scale solar is more cost-effective per kilowatt, but Delurey notes that when a public building is large enough for solar, “you are putting that generation directly on load, you’re consuming onsite. Anything that is concurrent consumption or paired with a battery, you are getting the full retail value of that energy. That is a feature you can’t really beat no matter how good the contract is with some utility-scale projects that are farther away.”

Delurey also noted that Michigan law mandates all energy be from clean sources by 2040; and 50% by 2030. That means Consumers needs to be building or buying renewable power, whether or not customers pay extra for it.

“So there are diminishing returns [to a subscription deal] at that point,” Delurey said. “You better be getting a price benefit, because the power on their grid would be clean anyways.”

“Some folks are asking ‘Why do anything now? Just wait until Consumers cleans up the grid,’” Gish acknowledged. “But our purchase shows we have skin in the game.”

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A complement to rooftop

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In 2009, Milwaukee adopted a goal of powering 25% of city operations — excluding waterworks — with solar by 2025. The city’s Climate and Equity Plan adopted in 2023 also enshrined that goal.

For a decade, the city has been battling We Energies over Milwaukee’s plan to install rooftop solar on City Hall and other buildings through a third-party owner, Eagle Point Solar. The city sought the arrangement — common in many states — to tap federal tax incentives that a nonprofit public entity couldn’t reap. But We Energies argued that third party ownership would mean Eagle Point would be acting as a utility and infringing on We Energies’ territory. A lawsuit over Milwaukee’s plans with Eagle Point is still pending.

In 2018, We Energies launched a pilot solar program in Milwaukee known by critics as “rent a roof,” in which the utility leased rooftop space for its own solar arrays. Advocates and Milwaukee officials opposed the program, arguing that it encouraged the utility to suppress the private market or publicly-owned solar. In 2023, the state Public Service Commission denied the utility’s request to expand the program.

Wisconsin Citizens Utility Board opposed the rent-a-roof arrangement since it passed costs they viewed as unfair on to ratepayers. But Wisconsin CUB executive director Tom Content said the city’s current partnership with We Energies is different, since it is just the city, not ratepayers, footing the cost for solar that helps the city meet its goals.

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Milwaukee is paying about $84,000 extra per year for We Energies to build solar farms on a city landfill near the airport and outside the city limits in the town of Caledonia. The deal includes a requirement that We Energies hire underemployed or unemployed Milwaukee residents.

The Caledonia project is nearly complete, and will provide over 11 million kWh of energy annually, “enough to make 57 municipal police stations, fire stations, and health clinics 100% renewable electricity,” said Milwaukee Environmental Collaboration Office director Erick Shambarger.

The landfill project is slated to break ground in 2025. The two arrays will total 11 MW and provide enough power for 83 city buildings, including City Hall – where Milwaukee had hoped to do the rooftop array with Eagle Point.

Meanwhile Milwaukee is building its own rooftop solar on the Martin Luther King Jr. library and later other public buildings, and Shambarger said they will apply for direct pay tax credits made possible by the Inflation Reduction Act — basically eliminating the need for a third-party agreement.

“Utility-scale is the complement to rooftop,” said Shambarger. “They own it and maintain it, we get the RECs. It worked out pretty well. If you think about it from a big picture standpoint, to now have the utility offer a big customer like the city an option to source their power from renewable energy — that didn’t exist five years ago. If you were a big customer in Wisconsin five years ago, you really had no option except for buying RECs from who knows where. We worked hard with them to make sure we could see our renewable energy being built.”

We Energies already owns a smaller 2.25 MW solar farm on the same landfill, under a similar arrangement. Building solar on the landfill is less efficient than other types of land, since special mounting is needed to avoid puncturing the landfill’s clay cap, and the panels can’t turn to follow the sun. But Shambarger said the sacrifice is worth it to have solar within the city limits, on land useful for little else.

“We do think it’s important to have some of this where people can see it and understand it,” he said. “We also have the workforce requirements, it’s nice to have it close to home for our local workers.”

Madison is also pursuing a mix of city-owned distributed solar and utility-scale partnerships.

On Earth Day 2024, Madison announced it has installed 2 MW of solar on 38 city rooftops. But a utility-scale solar partnership with utility MGE is also crucial to the goal of 100% clean energy for city operations by 2030. Through MGE’s Renewable Energy Rider program, Madison helped pay for the 8 MW Hermsdorf Solar Fields on a city landfill, with 5 MW devoted to city operations and 3 MW devoted to the school district. The 53-acre project went online in 2022.

Farrell said such “all of the above” approaches are ideal.

“The lesson we’ve seen generally is the more any entity can directly own the solar project, the more financial benefit you’ll get,” he said. “Ownership comes with privileges, and with risks.

“Energy is in addition to a lot of other challenging issues that cities have to work on. The gold standard is solar on a couple public buildings with battery storage, so these are resiliency places if the grid goes down.”

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