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Consultant says rooftop solar could pay back in 7–9 years; board warned of July 4 incentive timing
Summary
A consultant presented a high‑level analysis for an ~875 kW rooftop solar system with estimated installed cost about $3.2M; federal ITC and Illinois SRECs could return roughly $1.6M (ITC) plus $735K–$1.2M (SRECs) depending on program choice, producing a payback in 7–9 years and annual savings of about $150K–$160K; the board was told to act before July 4 to preserve key incentive timing.
A solar consultant presented a district‑level feasibility and financial overview for rooftop solar and described timing constraints tied to federal and state incentives.
Doug McMahon, owner of Allied, told the board an approximately 875‑kilowatt rooftop system was feasible on existing roofs and that the installed cost used for the analysis was roughly $3.2 million (a preliminary figure that could decline after competitive procurement). He described two key incentive streams: the federal Investment Tax Credit (ITC) and Illinois SRECs (Illinois Shines). Under the model used in the presentation the ITC would return about 50% of the cited system cost (roughly $1.6M) to the district within a year of commissioning, and SREC payments could amount to about $735,000 (15‑year production model) or about $1.2M (20‑year production model) depending on program selection.
McMahon said the consultant modeled utility bill savings conservatively—using a 4.5% annual escalation for energy costs and accounting for ComEd’s demand and supply rate constructs—and estimated the system would reach payback in roughly 7–9 years. He added the system would likely produce about 25% of the district’s annual usage on average, that bifacial panels help production on cloudy days, and that battery storage was not recommended for the district’s usage profile.
Board members asked about warranty and roof impacts. The consultant said the recommended system is a ballasted design with slip‑sheets that minimizes roof penetrations; he also said the vendor would coordinate with the roof warranty holder to protect coverage. Members also asked about insurance for storm, hail and wind damage; the consultant said production warranties can extend 25–30 years and physical warranties about 15 years, with insurance covering some storm/electrical damage scenarios.
McMahon emphasized timing: to preserve certain incentive options the district would need to expend about 5% of project cost before July 4 or else have a system fully installed and operational by 2027 to capture alternative timelines. Administration said it would consider whether to bring a formal recommendation to the board in June to meet incentive timing.
