New York City

Basically what happens is this:

• There's a significant fixed cost associated with maintaining gas infrastructure
• When there are fewer ratepayers, that cost is spread over fewer people
• So once more than a certain percentage of the population quits gas, it kicks off a spiral of increasing prices that push everybody who can afford to get off gas off it
• The few that are left are in real trouble financially.

This is why there has been a push in places like Ithaca to do it block-by-block, allowing for distribution shutdown in conjunction with individual building improvements.