When you put in commercial solar, you reduce the demand from customers for classic power era by way of fossil fuels. Although we don’t exclusively track 20kW systems, we do monitor 10kW & 30kW pricing – historic pricing trends for 30kW systems might be found from the graphs down below: https://50kwsolarsysteminwesternaustralia.blogspot.com/2024/09/selecting-right-solar-panel-installers.html