It doesn't have to be paid off for it to save you money. My power bill was $450 every month on average, the payment to the finance company is $350. I'm net $100 every month and I'm paying off something instead of just handing the power company money for no return. Then in 10 years for me, I will have no payment and actually have free power. Also if you are worried it won't add value, which the appraisal institute and fanny mae have released reports it does, you can get a pace loan which puts it as a special assessment. That way the payment for the system transfers to the new owner and it doesn't go off your credit. Just a thought since you are having power issues which I also was.