Normally, people come home from work and charge their EV immediately. Current grid systems can handle these new flows in power hardly. Smart Charging means that you postpone EV charging to timeslots with lower demand. This stabilize the grid and the EV owner can charge at lower, and even negative prices.
Edmij, together with Sensoria, developed a way to charge at realtime power prices per quarter of an hour. At September 25th, they initially postpone charging and starts charging at times with negative prices. Balancing the grid with smart charging brings benefits to the EV owner and the grid operator: a win-win!