City or Municipality as ISP?

Anyone knows of (good, mediocre or bad) practicies where cities or municipalities established or co-owned (with NGO or Corp.) entity that has internet service providing?
I only of existance of but even not much about how well is this implemented…around me very mediocre.

What are the needs that are best adressed this way?
I can imagine that under-serviced (remote) areas with bad connection and over-serviced (high density) areas with too many providers of similar quality (where there is not enough difference, but frequency polution and health of radiation is concern) would be relevant for local authorities to step in.