As is sadly the case with almost articles such as this - the title is not only clickbaity - but misleading.
A surge in Solar met all their requirements for an 8-hour period (probably very good weather across the entire country all at once) for the first time ever - for one day to break a record. The bulk is still headed by conventional power. And even then that surge was only achievable due to Germany's strong power exporting - with 7.7 Gigawatts still backing up the surge to meet demand.
Wind provides a fair bit more consistently, yet is still subject to weather (and wind-farms have the added effect of taking up massive areas at once).