One common way in which power gets installed for multiple properties is that the utility company tells the owner of one property that the running of their service to that property is contingent upon their being allowed to also run the service to neighboring properties. Even assuming that no permission was given, the fact that an easement is overburdened in one way does not mean that it can be overburdened in additional ways -- you still need to go back to the granting language or other binding authority.
You can see if the water utility might consider eminent domain as a means of getting access to your property, although that's rarely pursued when only a small number of lots are involved due to the cost.

