For a SPV plant to be a base load plant, it would have to store just a days worth of energy. Say we have a 100 MW plant. Use 50 MW to charge batteries and 50

For a SPV plant to be a base load plant, it would have to store just a days worth of energy. Say we have a 100 MW plant. Use 50 MW to charge batteries and 50 MW to supply power during the day. Having a battery capacity of 50 MW * 12 h = 600 MWh, will convert this plant to a 50 MW base load plant. Tesla's recent 25/50 MWh battery cost 25 Million USD, so a 600 one would cost about $300 Million.