Unless there's an Earthquake... but those never happen in SF... right?
Plus we really need to move away from having fools fuel piped into our homes. In an area as temperate as CA that's beyond idiotic. Not sure paying ~$15/mo to have gas available on the rare occasion the grid is out makes any sense...
There are automatic shut off valves for natural gas lines here in CA. Your insurance company gives you discounts for those.
The problem to cut the natural gas is home heating. Even if it is pretty temperate here, we have big swings day to night all year (unlike other parts of the country).
I've looked into electrical heating for radiant floors but did not choose it twice. There were not any standard options yet available to do this when I looked. I didn't want to gerry rig something inadequate.
Ironically I know some folks in town who built a very big house. They put in no heat except for one fireplace in the living room. They wanted to be LEED certified. Okay, so they are LEED certified but are sleeping at probably 50 degrees at night at the warmest half of the year, and then sending a lot of pollutants through the fireplace. Crazy.
Although electric heating is available, it has not been easy to get for substantial homes.