[akgerber]

Water and electricity and gas are generally less cost-efficient to provide to less-dense neighborhoods, as the length of wire & pipe (and maintenance overhead) needed to serve a given number of residences is significantly higher. This is likewise why electricity and phone service were not provided to rural areas until subsidized by the government by taxing urban dwellers.

[Grishnakh]

To new neighborhoods, you're right. To existing neighborhoods, you're wrong: the infrastructure is already there. There's no reason to raise rates for people for something that's already paid for. That's like adding a toll to a road that's been there for 50 years; it's just profiteering.

Maintenance is not going to be any higher for lower density; it's not like you see electric utility workers in the suburbs constantly, repairing stuff. And access is more difficult in higher-density housing too: in a suburb, you just drive the truck up to the transformer, but in a large building, it isn't that easy.

As for rural areas, there's a huge difference between urban and rural areas (where houses are miles apart), and urban and suburban areas (where houses are 20 feet apart).