I am in Sacramento, so we have a very high solar ratio for home rooftop, 4% of power last year came from PVs
There is no talk of charging us extra, they are still giving incentives on new homes and existing homes to add PV. But again, we are customer owned, not corporate.
And you have to have a pretty big system to get 100% of your power needs even in winter. Mine would have to be at least 4-5x bigger than it is, which would have cost $80 to $100K pre rebate. Winter output is just so low, in January, my system generates as little as 2KWh per day, 1/20 what it does in June/July
The best method is to get yourself under the Tier 1 cap, usually 1000Kwh per month. The rates are low because of the tier-ing system, and it pays itself back very quickly.
So my bill is generally around $70 per month, which means I am at about 70% of Tier 1 usage.