They are different than Vivint in that instead of renting the panel you buy them and they make money off of the financing/interest. They took a snapshot of my yearly usage with Rocky Mountain Power and used that to determine how much power I would need and how many panels.

My average Rocky Mountain bill is $52/month. If current rate increases continue over (power is going up about 4% every year) the next 25 years (typical life of the panels) I would pay about $25,000 to Rocky Mountain over the next 25 years. The cost for me to put in the solar panels, after getting the tax credits, would be about $5,000 and the interest over the life of financing would run my bill to about $10,000, plus an additional $3000 for the solar bill each month over 25 years. All told if I go with solar I would save $12,000 over 25 years and potentially $17,000 if I just pay it all up front which I most likely will do. It is an average savings of $680/year.

If I want to go the financing option, my bill would be $42/month which is $10 chepaer than what I am paying for Rocky Mountain right now.