Municipal Solar PV

Sun Prairie has resolved to achieve 100% renewable electricity for municipal facilities and operations by 2025. Currently 54% of Sun Prairie's municipal annual energy consumption is sourced from renewables!


On average, Sun Prairie's municipal facilities and operations consume 6.7 gigawatt hours (GWh) of energy each year. Out of this, 0.8 GWh are sourced from solar energy produced locally via the City Hall and Westside rooftop solar PV systems, and 2.4 GWh are blended renewable energy (solar, wind, and biogas) purchased through WPPI's Choose Renewable program. The renewable energy purchased through WPPI offsets 100% of the electricity consumption of the Sun Prairie Waste Water Plant. 

City Hall

City Hall Solar

67 kW solar PV system installed on City Hall in 2018.

  • 240 total modules
  • Average annual energy production: 77.5 MWh (data averaged from 2019-2022)
  • 713,000 lbs of CO2 emissions offset (equivalent to planting 5,348 trees!)

View real-time solar PV production at City Hall here.

Westside Community Services

Drone_Westside_3

121 kW solar PV system installed on the Westside Community Services building in 2019.

  • 335 total modules
  • Average annual energy production: 135.5 MWh (data averaged from 2020-2022)
  • 1,193,000 lbs of CO2 emissions offset (equivalent to planting 8,948 trees!)

View real-time solar PV production at Westside here.

Wastewater Treatment Plant

Drone_Solar_1

403 kW-DC system installed in 2024.

  • 738 total modules
  • Average annual energy production: 582 MWh (data averaged from 2024-2025)
  • 1,194,000 lbs of CO2 emissions offset (equivalent to planting 8,955 trees!)

View real-time solar PV production at WWTP here.

Last updated: August 7, 2025.