Unless it's particularly expensive to install there.

It is famously expensive here.

In comparison, California has way less seasonal variability in production

It depends on where in California the installation is. We have regions that get significant sun year round, and others that are under a coastal marine/stratus cloud layer for long periods of time. We also have alpine areas that have seasonal weather like you're describing, but relatively fewer people live in those areas.

Upside... the surfing is still good when its cloudy. :-)