I have an idea. Undersea or underwater powercable the name is not too important here. So the idea is just a powerpole with no collision and only buildable on water. Like a substation just no distribution area and longer cable. The visual is for example, substation and some water texture on it. ( It dosent have to be under water just look like that 😃 )

Yeah, I thought of a similar thing, but different enough. Instead of having a substation entity, you have a "water way" and a "cabled water way". Whereas the "water way" is free, the "cabled water way" would take come copper cables. Electricity flows and can be branched off these water ways w/ a "water-way-to-ground" pole (which is a glorified electric pole that can connect to "cabled water way" and the normal electric grid.