{"$L":{"aw":"What do solar panels cost in St. Clair County, IL?","ax":"As of August, 2025, the average per-watt cost for solar panels in St. Clair County, IL is $3.59/W. With the federal tax credit, the cost of a 5 kW solar panel system in St. Clair County, IL drops to roughly $12,565.","ay":"b"},"az":"dW"}