PG&E has divided its service area into 14 blocks of 550 megawatts. Other
utility companies, such as City of Palo Alto ( http://www.cpau.com ), have
their own blocks.
If you share a circuit with a "critical action" (i.e. hospital, fire station)
you will not have a rolling blackout code. The utility avoids interrupting
service to those facilities. However, they may still experience an uncontrolled
blackout if the grid fails.
All Internet facilities in California, which I checked, appear to be operating
normally. Calling around, some folks are or have been on emergency generator
power, but this has not affected customer service so far.