I recently received an unexpected email from David, who was good enough to write about his rooftop solar power installation for Green Path ten years ago:
As I was cleaning out our filing cabinet (yes, still have one of those!) I found all of our power bills back from when we first had solar installed. I crunched the numbers out of curiosity and found that in solar credits, we saved $7594 over the last 10+ years. This doesn’t include the offsetting of power (e.g. using the power off the roof during the day); that’s about $3000 worth. Given our 1.5 kW solar panels were only $3300 at the time, that’s not a bad return.