Supremacy (European Union law)
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The supremacy (sometimes referred to as primacy) of EU law is a principle by which the laws of European Union member states that conflict with laws of the European Union must be ignored by national courts so that the European Union law can take effect. The legal doctrine emerged from the European Court of Justice through a number of decisions.
In Costa v. ENEL. Mr Costa was an Italian citizen opposed to nationalising energy. 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 Court 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.
Many countries' highest courts have stated that Union law takes precedence provided that it continues to respect fundamental constitutional principles of the Member State, the ultimate judge of which will be the Member State (more exactly, the court of that Member State), rather than the European Union institutions themselves This reflects the idea that Member States remain the "Master of the Treaties", and the basis for EU law's effect. 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..."
- C-106/77, Simmenthal II  ECR 629, duty to set aside provisions of national law which are incompatible with Union law.
- C-106/89 Marleasing  ECR I-7321, National law must be interpreted and applied, insofar as possible, so as to avoid a conflict with a Community rule.
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 did include a declaration on primacy attached at the end (see box to the top right).
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 taking precedence to the law of Member States, but not all Member States share the analysis used by the European institutions about why EU law overrides national law, when a conflict appears.
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 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.
Solange II (Re Wuensche Handelsgesellschaft, BVerfG decision of 22 October 1986  3 CMLR 225,265) The German Constitutional Court held that so long as the ECJ 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  Case 11–70, 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 
Constitution of the Czech Republic states in the Article 10 of the Head 1 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.
Frontini v. Ministero delle Finanze  2 CMLR 372. In the Italian Vet Fees Case, the applicant 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.
The Constitutional Tribunal of Poland ruled that while EU law may override national statutes, it does not override the Constitution. In case 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 
C-213/89 Factortame I  ECR I-2433, Duty on national courts to secure the full effectiveness of Community law, even where it is necessary to create a national remedy where none had previously existed. The House of Lords accepted supremacy of EU law in this case. This is important in context of British Parliamentary Sovereignty. 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 EEC Treaty, it had been well established by jurisprudence before Parliament passed the European Communities Act of 1972.
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.
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 cases when the Constitutional Court finds the EU law contrary to the Lithuanian Constitution, the Union law loses its direct effect and shall remain inapplicable.
See also 
- Case 6/64, Falminio Costa v. ENEL  ECR 585, 593
- now found in Art. 86 and Art. 87
- "But this obligation does not give individuals the right to allege, within the framework of community law... either failure by the state concerned to fulfil any of its obligations or breach of duty on the part of the commission."
- Case 6/64, Falminio Costa v. ENEL  ECR 585, 593
- see especially, Solange II (Re Wuensche Handelsgesellschaft, BVerfG decision of 22 October 1986  3 CMLR 225,265)
-  2 CMLR 336.
-  1 CMLR 173.
- Verdict of the Constitutional Tribunal of Poland of May 11th, 2005; K 18/04
- Lord Bridge, 1991, Appeal Cases 603, 658; quoted in Craig, Paul; de Búrca, Gráinne (2007). EU Law, Text, Cases and Materials (4 ed.). Oxford: Oxford University Press. pp. 367–368. ISBN 978-0-19-927389-8. "If the supremacy within the European Community of Community Law over the national law of member states was not always inherent in the EEC Treaty it was certainly well established in the jurisprudence of the Court of Justice long before the United Kingdom joined the Community. Thus, whatever limitation of its sovereignty Parliament accepted when it enacted the European Communities Act 1972 was entirely voluntary. Under the terms of the 1972 Act it has always been clear that it was the duty of a United Kingdom court, when delivering final judgment, to override any rule of national law found to be in conflict with any directly enforceable rule of Community law."
- Ruling of the Lithuanian Constitutional Court dated 14 March 2006 in case no. 17/02-24/02-06/03-22/04