A community solar array at a Public Storage location in Justice, Illinois.Kari Lydersen/Canary Media
This story was originally published by Canary Media and is reproduced here as part of the Climate Desk collaboration.
Krzysztof Wasowicz, mayor of Justice, Illinois, has some concerns about solar: that it takes up farmland and enriches China. But he’s all-in on the community solar array that was recently deployed at a Public Storage facility in his village, a suburb of Chicago.
The panels are located on otherwise unused roof space and could provide significant savings for Illinoisans who subscribe to the project, while also helping the state meet its goal of 100% clean power by 2050.
“This creates more opportunities for people, job creation, and revenue that can be taxed by our state,” said Wasowicz, who has been mayor of Justice, home to about 12,000 people, since 2007. ”This is going to be an excellent addition to this village.”
The 763-kilowatt array, which went online in March, is one of 60 planned projects for the rooftops of Public Storage facilities in Illinois. Ten such projects are now online, and once completed, the portfolio will cover 5 million square feet of roof space, provide 44 megawatts of solar capacity, deliver $36 million total savings, and create 300 construction jobs, according to Solar Landscape, a leading developer of rooftop community solar sites nationwide.
Only a fraction of industrial and commercial roof space is currently used for solar, because those projects are generally more expensive to build and interconnect than ground-mounted arrays in rural areas. But thanks to new incentives, developers, utilities, and building owners nationwide are increasingly considering the possibilities.
Federal data analyzed by the solar company Lumen Energy found that commercial, industrial, and school rooftops could host enough panels to provide 581 gigawatts of power, nearly enough to meet the entire country’s energy demand. Cook County, Illinois, which includes Justice, is among the metropolitan areas with the greatest potential, that analysis found.
Mark Schottinger, president and chief legal officer of Solar Landscape, said that working with large companies like Public Storage allows his company to deploy rooftop projects quickly at multiple sites.
“The beauty of commercial-industrial real estate is the speed and scalability,” he said, noting that major logistics, storage, and big-box companies ”have millions of square feet around the country.”
Community solar allows households, businesses, and organizations to reap savings and support clean energy even if they can’t have their own solar panels. By subscribing to a community solar array, customers get credit on their energy bill for a portion of the solar power generated.
Illinois is among the nation’s leaders in community solar capacity, according to the Solar Energy Industries Association, with more installed than even California. It is among the two dozen states that have laws enabling community solar, which typically leads to more arrays than in states without specific policies.
Illinois’ 2016 clean energy law created generous incentives for community solar, leading to a boom in projects of up to 2 MW each. An energy law passed last fall made the incentives available for projects of up to 10 MW.
Most of the state’s community solar has been built on rural land or industrial brownfields. About a fifth of the arrays are on rooftops, with the rest being ground-mounted. The rooftop arrays are concentrated in the Chicago area, and rooftops are an increasing priority for community solar, according to Paul Kovacs, project execution manager for distributed energy resources for utility ComEd, which serves northern Illinois.
Solar developers are still in the ”early innings” of using rooftops for community solar. But ”it’s growing exponentially.”
At a July 30 event promoting the Justice project, Melissa Washington, ComEd’s senior vice president for government relations and external affairs, called rooftop community solar ”an elegant solution” for deploying clean energy to meet rising demand.
She listed three mandates for the utility: supplying power to businesses and residents, keeping electricity affordable, and addressing climate change—a necessity underscored by violent storms three days earlier that had left many ComEd customers without power.
Rooftop community solar, she said, ”checks the box for every single one of those three critical priorities.” The utility plans to have over 400 community solar arrays in service by the end of this year, she added. Kovacs said about 100 of those will be on rooftops.
In a typical setup, a company like Solar Landscape develops and owns the array and collects revenue from incentives and subscribers. Those subscribers get savings on their energy bills, the property owner hosting the panels gets lease payments, and the utility gets credit toward renewable energy mandates. The utility works with the developer to make any upgrades needed to connect the array to the grid, which the developer pays for so that costs are not passed on to ratepayers.
The Public Storage projects are part of Illinois’ Community-Driven Community Solar program, meant to incentivize solar arrays whose subscribers are predominantly local households and small businesses or nonprofits, as opposed to a few large subscribers hogging the savings.
Under state law, owners of community solar can sell renewable energy credits to utilities for revenue that makes the financing equation more favorable for all the partners involved. The incentives are awarded through a highly competitive process, and proposals gain points for being in designated low-income or environmental justice census tracts, having a large proportion of local subscribers, involving the community in design and planning, and hiring through the state’s workforce training programs, among other factors. The community solar credits are also worth $5 more per megawatt-hour for rooftop installations.
The Justice project earned points for making charitable contributions and for hosting a workforce training program in conjunction with the New Jersey–based training and education nonprofit STEP-UP Solar, according to Solar Landscape marketing director Samantha Kanipe.
State incentive programs are critical to facilitating community solar development since the expiration of federal tax credits under the Trump administration’s 2025 spending bill, advocates note. Meanwhile, arrays on industrial and commercial sites, like the Public Storage ones, can still qualify for federal tax credits if they are operational by the end of 2027, or if they started construction by July 4 of this year.
“We began construction on a ton of projects before July 4,” including all the Public Storage ones, said Schottinger of Solar Landscape, noting that his company can build an array like the one in Justice in about six months.
He said his company and other solar developers are still in the ”early innings” of using rooftops for community solar. But, ”it’s growing exponentially,” he added. ”There’s a lot of blank space out there.”
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