WI AB901

Electric providers cannot prohibit interconnection with rooftop solar systems based on generating capacity if the system is 500 kilowatts or less for commercial buildings or 30 kilowatts or less for residential buildings

Excess electricity delivered to the grid earns customers a credit at 100% of the retail electricity rate, which can be applied to future bills; credits expire March 31 annually and are transferable to new building owners upon sale

Battery storage capacity cannot be counted when calculating whether a rooftop solar system exceeds the generating capacity limits

Electric providers may reduce the credit rate to 90% of retail if rooftop solar adoption in their service territory exceeds 10% of summer peak demand in any of the preceding 12 months, with 60 days written notice required

Rooftop solar systems must include advanced metering infrastructure and allow meter aggregation to interconnect with electric distribution facilities