Late last year, I had a solar electric system installed on my roof. This was NOT to reduce my electric bill. This was because Southern California Edison (SoCalEd) is unreliable. Any time of the year and in any kind of weather, SoCalEd will fail in my community for 5 minutes, 5 hours, or longer. To protect against a nighttime outage, my system includes a 12-hour backup battery.
Early this year, I replaced my 14-year-old VW Jetta with an all electric Nissan Leaf.and had a level 2 charger installed in my garage. No, I do not charge at night. I charge in the morning when the solar electric system -- not SoCalEd -- supplies the power. (No, I do not commute to work. I am retired.)
Yes, here in southern California, we are experiencing "gray May" and "June gloom". The skies are often completely overcast, and we might go a week or more without enough sunshine to cast shadows. Nevertheless, I am exporting more electricity to SoCalEd than I am importing from SoCalEd. Charging my Nissan Leaf at home has not reversed that situation.
The answer is not to expand the power grid, which moves electricity from where it is generated to where it is used. The answer is to encourage property owners -- not just homes but also apartment buildings, factories, shopping centers, schools, sports stadiums -- to install solar electric systems. This would localize the generation of electricity to where it is used without straining long distance grids. Excess generation could be stored in batteries for nighttime use (as is already happening at my house and in a large area of Australia).