The primacy of European Union law (sometimes referred to as "supremacy") is an EU law principle that when there is conflict between European law and the law of Member States, European law prevails; the norms of national law have to be set aside. This principle was developed by the European Court of Justice, and, as interpreted by that court, it means that any norms of European law always take precedence over any norms of national law, including the constitutions of member states. Although national courts generally accept the principle in practice, most of them disagree with this extreme interpretation and reserve the right, in principle, to review the constitutionality of European law under national constitutional law.
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In Costa v. ENEL. Mr Costa was an Italian citizen opposed to the nationalising of energy companies. Because he had shares in a private corporation subsumed by the nationalised company, ENEL, he refused to pay his electricity bill in protest. In the subsequent suit brought to Italian courts by ENEL, he argued that nationalisation infringed EC law on the State distorting the market. The Italian government believed that this was not even an issue that could be complained about by a private individual, since it was a national law decision to make. The European Court of Justice ruled in favour of the government, because the relevant Treaty rule on an undistorted market was one on which the Commission alone could challenge the Italian government. As an individual, Mr Costa had no standing to challenge the decision, because that Treaty provision had no direct effect. But on the logically prior issue of Mr Costa's ability to raise a point of EC law against a national government in legal proceeding before the courts in that member state the ECJ disagreed with the Italian government. It ruled that EC law would not be effective if Mr Costa could not challenge national law on the basis of its alleged incompatibility with EC law.
It follows from all these observations that the law stemming from the treaty, an independent source of law, could not, because of its special and original nature, be overridden by domestic legal provisions, however framed, without being deprived of its character as community law and without the legal basis of the community itself being called into question.
In other cases, countries write the precedence of Union law into their constitutions. For example, the Constitution of Ireland contains a clause that, '"No provision of this Constitution invalidates laws enacted, acts done or measures adopted by the State which are necessitated by the obligations of membership of the European Union or of the Communities...."
Article I-6 of the European Constitution stated that "The Constitution and law adopted by the institutions of the Union in exercising competences conferred on it shall have primacy over the law of the Member States." However, the constitution was never ratified but its replacement, the Treaty of Lisbon included the following declaration on primacy:
Particular countries
Depending on the constitutional tradition of member states, different solutions have been developed to adapt questions of incompatibility between national law and EU law to one another. Union law is accepted as having supremacy over the law of member states, but not all member states share the ECJ's analysis of why EU law takes precedence over national law when there is a conflict.
France
Like many countries within the civil law legal tradition, France's judicial system is divided between ordinary and administrative courts. While the ordinary accepted the supremacy of EU law in 1975, the administrative only accepted the doctrine in 1990. Before this the supreme administrative court, the Conseil d'Etat, held that as the administrative courts had no power of judicial review over legislation enacted by the French Parliament, they could not find that national legislation was incompatible with EC law or give EC law precedence over conflicting national law. This was in contrast to the supreme court of the ordinary courts, the Cour de cassation, which in the case of Administration des Douanes v Société 'Cafes Jacques Vabre' et SARL Wiegel et Cie, ruled that precedence should be given to EC law over national law in line with the requirements of the Article 55 of the Constitution which accorded supremacy to ratified international treaty over national law. The administrative courts finally changed their position in the case of Raoul Georges Nicolo when the decided to follow the reasoning used by the Cour de cassation.
Germany
In Solange II the German Constitutional Court held that so long as (German: solange) EU law had a level of protection of fundamental rights substantially in concurrence with the protections afforded by the German constitution they would not longer review specific Union acts in light of their own constitution. Initially, in Internationale Handelsgesellschaft, known as the Solange I case, the ECJ ruled not even a fundamental principle of national constitutional law could be invoked to challenge the supremacy of directly applicable Community law. This had created a serious conflict between the ECJ and the German Constitutional Court.
Czech Republic
Article 10 of the Constitution of the Czech Republic states that every international treaty ratified by parliament of the Czech Republic is a part of the Czech legislative order and takes precedence over all other laws.
Italy
In Frontini v. Ministero delle Finanze, the plaintiff sought to have a national law disregarded without having to wait for the Italian constitutional court do so. The ECJ ruled that every national court must apply Community Law in its entirety.
Poland
The Constitutional Tribunal of Poland ruled that while EU law may override national statutes, it does not override the Constitution. In cases of a conflict between EU law and the Constitution, Poland can make a sovereign decision as to how this conflict should be resolved (i.e. by changing the Constitution, leaving the EU or seeking to change the EU law).
United Kingdom
In R v Secretary of State for Transport, ex p Factortame Ltd, the House of Lords ruled that courts in the United Kingdom had the power to "disapply" acts of parliament where they conflicted with EU law. Lord Bridge held that Parliament had voluntarily accepted this limitation of its sovereignty, being fully aware that, even if the limitation of sovereignty was not inherent in the Treaty of Rome, it had been well established by jurisprudence before Parliament passed the European Communities Act 1972.
However, in the 2014 case of R (HS2 Action Alliance Ltd) v Secretary of State for Transport, the UK Supreme Court said:
Ireland
The Third Amendment of the Constitution of Ireland explicitly provided for the supremacy of EU law within the Republic of Ireland by providing that no other provision of the Irish constitution could invalidate laws enacted which was necessitated by membership of the then European Communities. In Crotty v. An Taoiseach the Irish Supreme Court held that the ratification of the Single European Act by Ireland was not necessitated by membership of the European Communities and could therefore be subject to review by the courts.
Lithuania
The Lithuanian Constitutional Court concluded with its Ruling dated 14 March 2006 in case no. 17/02-24/02-06/03-22/04, § 9.4 in Chapter III, that EU law has supremacy over ordinary legal acts of the Lithuanian Parliament, but not over the Constitution. In case when the Constitutional Court finds the EU law contrary to the Lithuanian Constitution, the Union law loses its direct effect and shall remain inapplicable.