In 2023, NW-Europe had a record number of hours with negative power prices (day ahead). Such prices occur due to oversupply of electricity from sources with zero marginal costs (mainly solar and wind).
I expect that the number of hours with negative prices in NW-Europa will increase considerably in the coming years, because the growth of solar and wind (10-20% annually*) will be much larger than the growth of electricity consumption (about 1-2% annually*)
*source: FitFor55 scenario's).
@suqdiq @BM_Visser @albertcardona I usually monitor svk.se, slightly different coverage area. Unfortunately llnl.gov hasn't updated their charts since 2017?