Solar is still a great investment with returns of 12.5% which beats most savings rates.  The return is even higher on new builds. Numbers updated 22 November 2017 Item Value Payback 8.0 years Return on investment 12.5% Government incentives £6,463 Savings on electricity bill £6,998 Cost of 4kW PV £5,404 Profit £8,058 [...]