The Future of Solar in Illinois
As of November 30th, 2025, the state of Illinois adopted the 2024 International Energy Conservation Code, which introduces new solar-ready requirements for most new commercial buildings statewide. These updates are designed to make it not only easier but also more cost-effective for building owners to install solar energy now or in the future. This is a huge step towards the state’s goal of achieving one hundred percent clean energy by the year 2050, as part of the Climate and Equitable Jobs Act, 2021 (CEJA).
Under the updated code, the Illinois Energy Conservation Code, new commercial buildings must be designed with solar-ready infrastructure. Part of this includes roofs designed to encompass solar or are suitable for solar installation in the future. Buildings must also include electrical and pathway provisions, such as conduit routes and reserved space in electrical panels suited for future solar breakers. These measures ensure that adding solar later can be done quickly and efficiently without major structural or electrical modifications.
These requirements apply statewide, with limited exceptions that allow certain buildings to qualify for alternative compliance. By preparing buildings for solar from the outset, owners can reduce future installation costs, increase property value, and support long-term energy savings. The future of solar in Illinois is no longer a debate but a requirement.
What does this mean for future businesses in the state of Illinois? For businesses planning construction in Illinois, these requirements mean that solar readiness must now be considered during the design and planning stages. Developers are now needing to consider adequate roof space as well as structural capacity and electrical infrastructure.
While this may add small design considerations or changes, these requirements will significantly decrease the cost as well as the complexity of installing solar down the line. Businesses that choose to install solar immediately can take advantage of available incentives and long-term energy savings, while those that wait will still benefit from having the infrastructure already in place.
The bottom line is that Illinois is serious about reaching its renewable energy goals within the next 25 years. Whether business and building owners decide to install solar now or later is their choice, but thanks to these new solar-ready requirements, making that decision has never been easier.
Source: Illinois Energy Conservation Code (20 ILCS 3125/15)
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