So, at four and a half hours before sunrise. The big driver of renewables in California is solar - check the graph for the whole of yesterday, and you'll see h

So, at four and a half hours before sunrise. The big driver of renewables in California is solar - check the graph for the whole of yesterday, and you'll see how different the picture is during the day. Yes, there's still a gap overnight which over time will come to be filled by more wind and battery storage. But California's really lucky with solar - it's already so cheap and easy that it makes battery storage financially viable even using today's tech. It's now just a matter of continuing to scale it out...