Location: Harvard, Massachusetts

Watts: 14,850

Monthly Production: 1237 kWh

Date: June 2019

This 45-panel solar energy system is making 79% of the homeowner’s annual electricity usage. Altogether, it’s like paying $0.10 per kWh for 25 years instead of paying an ever-inflating rate starting at $0.21 per kWh.  It pays for itself in about seven and a half years. After that, it delivers free electricity and continues to pay green income to the homeowner. Can you name another purchase that pays you back?