Should utilities (electricity, water/sewer, etc) be allowed to run for profit?

[True Federalist (진정한 연방 주의자)]

Regulated monopolies are in general the best model for highly infrastructure dependent services, such as the electric grid.  They allow for a profit incentive that holds costs down, while at the same time encouraging regular maintenance and building the infrastructure to last.  Pre-breakup AT&T was a damn good company that points out the benefits of such a system, but also the pitfalls.  AT&T was an excellent landline voice phone company, but it had trouble in integrating new technologies quickly.  Still, it probably did so faster than it would have if it it had been publicly owned.