Generally, having an electric car would push your electric bill into much higher usage tiers where the power is most expensive. Solar panels make the most sense for people who use the most electricity and pay the most for it. I've seen first hand that people who drive electric cars like to talk about clean energy and if they've got solar panels on their roof, it refutes the argument about burning coal to generate the electricity. As solar panels continue to drop in price, it starts to make more sense for the rest of the population, too.

> Or is it just that electric cars and solar panels appeal to the same small segment of the population? That would show a strong correlation, but not scale well.

Tesla is a luxury product company. All of their products are either luxury or commercial. Their strategy scales well in that segment.