Our utility (BPU) is pushing leasing panels for $470 per panel with a $3.20 credit per month, so a little over 12 years to payback. That is if the lease is a one time purchase, should be but not sure I trust them. You can sell the panels back if you move. We're only planning on being here for 11-12 years but might keep the house regardless. After we pay the house off we discussed getting 4-5. Those solar farms are good way to kick start renewable energy.