Some area homes get only electricity from PG&E, while others get both power and natural gas piped in from PG&E. Generally speaking, those homes located in and near our small cities will get both gas and electricity from PG&E. Homes located in the unincorporated areas will just get electricity from PG&E, and have to supplement that with an on-site propane tank that gets filled by a local supplier. Here is an interactive tool on the impacts and cost of reducing your home's use of natural gas/propane: 

CA AIR RESOURCES BOARD: COMPARE GAS APPLIANCES TO ELECTRIC 

https://ww2.arb.ca.gov/our-work/programs/technology-clearinghouse/technology-clearinghouse-tools/residential-appliance-comparison\