50Hz wave length is at ~6000 km so it frankly isn't a problem. You'd have to have 2 different routes from same power source that differed in hundreds of kilome

50Hz wave length is at ~6000 km so it frankly isn't a problem. You'd have to have 2 different routes from same power source that differed in hundreds of kilometers in length and that just doesn't really happen. And small phase difference would just cause uneven loading Also that power would be "used up" closer to the power source and you'd be sucking off power from closer sources.