What are the reasons why an interconnect might be uni directional? I get that a DC interconnect might only go in one direction at a time, but might it not be able to change such direction that is?
Regulation and tax are big ones. The ElecLink UK/France interconnector was significantly delayed due to disagreements in how it should be regulated and taxed. Similarly, things like the EU Carbon Border Adjustment mechanism have the potential to make it unprofitable to import electricity into the EU without affecting exports (because even significant price discrepancies would be swallowed up by the additional carbon tax which might be imposed). (In the case of the UK the EU will likely agree to waive the carbon tax but it's not certain even there).
