SpackleFrog
Smash showy bell-bottom pants and sporty haircuts
Let me help you... Nationalisation Is Not Against EU Law | HuffPost UK
From the article you posted: "Professor Nicol raises an important point. The EU probably encroaches on the sovereignty of member states to its most egregious degree when it comes to market liberalisation. Art. 176 TFEU commits member states to the expansion of markets."
This is a better source than HuffPost - How the Single Market blocks socialist policies
Explains it a bit better than I have, admittedly, but then I don't even know why I'm bothering - "Large-scale nationalisation would breach the Lisbon Treaty. Small-scale nationalisation would have to comply with competition laws which make it ineffective, or breach the Lisbon Treaty. Big state subsidies to save or create jobs would breach the Lisbon Treaty."