Build cost
Solar farm is at least half cost of coal plant.
Running costs
Solar 5c Coal 25c / kWh
Upkeep
Each 25 years replace solar panels.
At that time cost should be half.
Batteries
Grid controller can assess when and where
they are needed.
Likely to be little need 6 am to 6 pm.
VPPs with batteries in homes can help.
Next gen solid state battery will be
twice density, so half cost.
Due 2025-2030