[jo909]

Transporting electrical power over long distances is expensive. If most demand is in cities, most power plants need to be relatively near cities.

[Turing_Machine]

High voltage transmission lines are actually pretty efficient. We routinely distribute power over hundreds of kilometers. There are a couple that are over 2,000 km long, and numerous examples over 1,000 km.

http://www.power-technology.com/features/featurethe-worlds-l...