Honestly, the EU27 have their own home-grown grid problems to deal with[0], helping third countries transit power through the EU territories must be right at the bottom of the list!
Austria and Germany had a single electricity price zone ... until October 2018, one of the reasons blamed for the split was "slow grid expansion"[1].
[0] https://www.euractiv.com/section/electricity/news/german-ele...
[1] https://www.apg.at/api/sitecore/projectmedia/download?id=24f...