The cheapest base load batteries are molten salt powering steam...

The cheapest base load batteries are molten salt powering steam turbine generators, perfect for solar thermal and this country.
With the rapid advances in technology wind turbines could soon have their towers housing batteries to supply their own base load or feed excess power to a single baseload battery power station.

Another advantage with solar power are the local power sources that reduce the need for a national network. Most of the current cost is building and maintaining that national network, 90% was a figure I saw recently. Local renewable energy makes that redundant and is one of reasons this government is so desperate to support coal after spending $20billion? on upgrading that network for a declining market.