According to EnergySage: “Colorado’s average cost of a solar panel installation ranges from $13,302 to $17,998. On a cost per watt ($/W) basis, you can expect a solar panel installation in Colorado to range in price from $2.66 to $3.60”
Depending on a variety of factors (system size, financing, incentives) roof top solar systems typically pay back in 8 years. Solar panels have an average expected lifetime of 25 years.