There's also the political issues to consider. You'd have to really, really trust the other countries you're relying on for the supply of electricity not to do something to mess with your economy. I could imagine it working politically in an area like the EU[1] or between the US and Canada, but across Asia or the Middle East there's likely to be too little trust.

An example with pipelines, Russia turned off gas pipelines into Ukraine in 2009 in winter: https://en.wikipedia.org/wiki/2009_Russia%E2%80%93Ukraine_ga...

[1] http://europa.eu/rapid/press-release_MEMO-15-4486_en.htm