Interesting! Where I live there are essentially three different providers for long haul SCADA, the railroad infra company, the telcos and the cable companies. And then there are some specialized fiber companies as well. Most power infra that I've seen up close did not include integral communications though I guess it makes sense.
But even the largest grid infra companies here rely on the telcos for their private comms, for instance:
Note the mention of "KPN" for this private mobile network that is nominally owned by the energy company grid operators but in fact is operated by KPN (the largest Dutch Telco) and uses their infra.
But even the largest grid infra companies here rely on the telcos for their private comms, for instance:
https://nieuws.eneco.nl/stedin-en-liander-bundelen-krachten-...
Note the mention of "KPN" for this private mobile network that is nominally owned by the energy company grid operators but in fact is operated by KPN (the largest Dutch Telco) and uses their infra.
Which country are you in?