“No,” says Ballack of PQRS. “Not right now. Ten years ago, definitely not. Ten years from now, it could be. A solution without batteries would be the winning solution, if we can figure that out.”Perhaps it would be better to sell that surplus back to the grid energy provider. It means extra power flowing into the grid during peak hours, and keeps demand for municipal power up at night. Unless Eskom or other offtakers are willing and able to take on excess power during the day and resupply it by night, the onus is on the individual small power producer to find a way to store it.