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District solar system saves hundreds of thousands but Prairie View inverters reduced output
Summary
Performance Services reported the district's four-school solar installation cut electricity costs by about 28% and produced roughly $200,000 in utility-bill savings this year, but repeated inverter failures at Prairie View lowered total production; warranty replacements and a vendor rebate program are underway.
Kurt Hintz, business development manager for Illinois with Performance Services, told the Frederick School District Board on Aug. 13 that the district's four-school solar array is delivering major savings but that component failures at one site reduced overall production. "We've had a over $200,000 again cost reduction in utility bills," Hintz said, adding the system still produced close to projected savings despite Prairie View's problems.
Why it matters: The district installed roughly 2.3 megawatts across four buildings, one of the larger single-district K-12 installations in the state, and the solar output reduces the district's fixed electricity burden and shifts peak-demand charges to lower-rate days.
Performance Services presented production and financial totals showing a roughly 28% reduction in annual electricity costs for the district, and lifetime benefits the presenter summarized as nearly $4 million when energy savings, ComEd rebates and SREC income are combined. Hintz said Prairie View's large system experienced multiple inverter failures this year; several inverters were replaced under warranty and more replacements are planned. He said SolarEdge, the inverter manufacturer used on the project, has a warranty program and has put together a rebate effort to help make up some losses.
The company also identified local operations-and-maintenance support: a contractor referred to as Altaf/Altoff and district staff Jose were named as working with Performance Services and contractor George, a field technician, to inspect and replace failing components. Hintz said the district is not set up for continuous daily monitoring by Performance Services, but district staff can contact the vendor portal and Performance Services for repairs.
Board members asked whether the Prairie View inverter issue was likely to appear at the other schools; Hintz said his team had not seen the same failures at the other sites to date and that they will monitor more closely now that they know what to look for. He emphasized the failures are component-level issues rather than installation errors.
The presentation included month-by-month production charts showing June and July as high-performing months and noted that cloudy weather and winter conditions reduced some output. Hintz said demand-shifting (the solar generation reducing the district's highest-demand charge days) contributed materially to savings beyond the raw kilowatt-hours produced.
What happens next: District staff and the vendor will continue replacements under warranty, engage the installer for O&M work, and use the vendor portal to report further failures; the board was not asked to take additional action at the meeting.
