I had Vivint stop by. Their model is “you pay X per kilowatt hour from us, which we guarantee is lower than it would be from the utility”.
However, their was enough fluff language in the contract that they could increase X anytime they wanted, and the contract had to be signed before they would present you with all the amendments of the contract. In other words, they could charge you whatever in the future, and you were signing a contract, portions sight-unseen.
Much happier with the Sungevity model. They have an option of “Pay us Y, here’s your solar panels. Enjoy!” For complicated tax reasons, a pre-paid 20 year lease was half the cost of buying the panels from Sungevity, too.
