With the increase of renewable energy sources, the Dutch energy market is becoming more variable, and so are electricity prices. Recoy adjusts the charging process to developments in the electricity market. The imbalance market, created by grid operator Tennet, ensures that the supply and demand of electricity are always in balance. Basically, what happens on the imbalance market is shifting electricity deficits and surpluses back and forth, with associated rates. Last year there were more than 2000 hours with negative prices on the imbalance market.