The infographic is using 10c/watt as solar panel only. Your 10 year payback is based on tariffs, permits, sales comissions, and a monopoly utility designed to make solar prohibitive. In Australia, payback is about 2 years. But, yes, at utility scale the lack of BS costs make a giant difference. Under $1/watt installed instead of $3+/watt.
The infographic is using 10c/watt as solar panel only. Your 10 year payback is based on tariffs, permits, sales comissions, and a monopoly utility designed to make solar prohibitive. In Australia, payback is about 2 years. But, yes, at utility scale the lack of BS costs make a giant difference. Under $1/watt installed instead of $3+/watt.