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The Euclid Avenue United Methodist Church in Oak Park, Illinois, transitioned toward net-zero energy by replacing a gas boiler with a $350,000 geothermal heat pump system in 2011, which reduced annual gas costs by $11,500 and greenhouse gas emissions by 81%. To offset the resulting increase in electricity demand, the church installed a 35-kW rooftop solar system in 2014 and later subscribed to a community solar farm in Rockford in 2021. Additional efficiency measures, including LED lighting and night setback temperature controls, further reduced electricity consumption by approximately 47,000 kWh annually.

The report details how Illinois municipalities use Community Choice Aggregation (CCA) to pool electricity purchasing power, enabling them to negotiate lower rates and switch to cleaner energy sources. Since 2013, over 90 Illinois towns have transitioned to 100% renewable electricity via Renewable Energy Credits (RECs), increasing demand for wind and solar by over 6 terawatt hours. The document provides case studies from Oak Park and Chicago, analyzes CCA adoption in other states like California and Massachusetts, and offers strategic recommendations for municipalities to move beyond RECs toward local renewable energy investments.