You can't effectively do that since the spot price per kilowatt-hour changes drastically from every minute. The per minute pricing reflects that, so you don't h

You can't effectively do that since the spot price per kilowatt-hour changes drastically from every minute. The per minute pricing reflects that, so you don't have to worry about fluctuating prices. It also add a "tax" for "hogging" the chargers, as the rate of which you're able to charge drops significantly after some time. You're probably being gauged compared to the true cost per kilowatt-hour, but that just mean there's room for more competition.