The headline appears to be misleading. From the article: "The continuity lies not in renewables running the grid for the entire day ..." So it's not actually

The headline appears to be misleading. From the article: "The continuity lies not in renewables running the grid for the entire day ..." So it's not actually that California's electricity demands were met by renewables 100% of the time as one might think, given the headline. As far as I can tell, it's not even that, disregarding the intermittency problem, total energy demand was met, on average. It's just that sometime during the day 100% was hit.