> but that’s only if the energy prices don’t fall. You also need to consider what happens if prices keep rising, because if that happens the investment is paid

> but that’s only if the energy prices don’t fall. You also need to consider what happens if prices keep rising, because if that happens the investment is paid back sooner. I can only speak for what I see happening here in Australia. Energy prices in Australia have been rising rapidly for a very long time and for several reason and don't look like falling any time soon. From here: https://finance.nine.com.au/personal-finance/residential-energy-prices-increased-63-percent-since-2007/1607bea2-6d7d-4842-9bf8-a3c47867bbae https://finance.nine.com.au/personal-finance/residential-ene... Residential prices increased 63 per cent since 2007 and the average household bill was about $1524 plus GST. It is this very sharp rise in electricity price that has driven the boom in rooftop solar here in Australia. At those prices rooftop becomes very attractive.