Solar farm is at least half cost of coal plant.
Solar 5c Coal 25c / kWh
Each 25 years replace solar panels.
At that time cost should be half.
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.
Solved Go to Answer
Assessing grid with a supercomputer will give
energy savings so reduce battery need.
Good place for batteries is near solar farms
connected by a separate power line.
This will allow maximum use of high power
transmission line from solar farms to city.
Solar energy to city 7 am to 6 pm, excess energy to
batteries. After 6 pm energy from batteries and coal.