Renewables and storage (batteries and pumped) just about a no brainer going forward for Au, based on levelised user costs:
""Wind and solar - with battery storage - are not cheaper than coal, assuming no risk premium is applied to the financing of coal.
Wind, backed up by pumped hydro, remains slightly cheaper than black coal with no risk premium applied. Solar, backed up by pumped hydro, is marginally more expensive.However, as discussed, it is realistic to assume coal-fired power stations would be more costly to finance. If a risk premium is applied, wind and solar plus back-up remains unambiguously cheaper than coal as a source of energy.The cost of new generation by energy type.
Nuclear power, on the other hand, is estimated to be well over double the cost of coal, wind or solar, regardless of risk premiums or backup.The CSIRO and the Finkel review both predicted the cost of solar and wind energy would continue to fall into the future, while the cost of coal-fired power would remain relatively static.""
from
www.abc.net.au/news/2019-09-12/is-renewable-power-cheaper-than-coal-nuclear-malcolm-turnbull/11495558Installing 3kW or 6kW solar system is a no brainer. Looking for about a 5yr simple payback on a 10 year plus life (for a good install). You then ultimately get 20% on your investment - hard to beat that in today's low interest environment. Batteries still not quite cost effective though at the individual level.