There are plenty of monopolies, duopolies, etc in the "free" market that have nothing to do with governments. Example: How broadband companies share the map and don't intrude into each other's "territories".
Largely in part due to regulatory capture; it is not necessarily innate of a government to cause this. Maybe restrictions on how corporations are able to influence governments to act against their constituency might solve this problem, rather than giving corporations carte blanche to do anything...
When the capital investment to compete with large players in the ISP/electricity market is enormous you will, eventually, end up with a monopoly either way.
Laying cables for internet/electricity is expensive, I cannot comprehend why the USA hasn't understood this particularity and hasn't attempted to create a publicly-owned national grid and fibre infrastructure where providers can plug into and offer internet connectivity and electricity production over it.
You do not want multiple competing companies laying down their own electricity cables, nor internet cables, it's wasteful and just creates a huge barrier for any competition to appear...
Other countries have tackled this issue by regulating that the company that owns the cable and the company that provides the service over the cables are separate entities, frequently with the cable owner being the state.