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PG&E has an option where you can choose to have 50% or 100% of your power come from solar:

>...When you enroll, PG&E will purchase additional, new solar resources to meet your electricity needs as well as those of other participating customers.

As you might have guessed, you pay a premium for his option:

>...Your monthly electric energy statement will include a charge for the solar power you are purchasing and related program charges, as well as a credit for the standard generation you are no longer purchasing. Today, the net of these charges and credits is a premium.

https://www.pge.com/en_US/residential/solar-and-vehicles/opt...

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It looks like the premium has dropped rather dramatically just over the past couple of years (over 40% for average residential, and to almost zero for medium and large commercial.)