Sure you save long term but 4 in 10 Americans can't come up with $400 let alone however much this roof will cost. It's a problem of a lack of cash on hand more than electricity costs, solar pays for itself in x amount of years no matter how much you pay per kWh, and in some cases you can sell excess back to the grid.

https://www.federalreserve.gov/publications/2018-economic-we...