Yes, there is just that much solar being installed. The grid demand curve used to look like a bell curve (peaks mid-day, goes down in the evening). Nowadays, in California there's so much solar that it basically decapitates the curve half way down. Here's today's CAISO demand curve:

http://www.caiso.com/TodaysOutlook/Pages/default.aspx

The industry term for this is called the "Duck Curve", where you install so much solar that you mostly reduce daytime electricity demand, but have peaks in the morning and evening.

https://en.wikipedia.org/wiki/Duck_curve