UPDATE 1-Italy court rejects regions' appeal on nuclear sites

- 10 regions had appealed for say on location of plants

- Ruling gives central govt final say on siting (Updates with background)

ROME, June 23 (Reuters) - Italy’s top court on Wednesday rejected an appeal by 10 Italian regions to have a say on the location of any nuclear power plants built, judicial sources said.

The ruling by the constitutional court, which had been championed by companies hoping to build the plants and opposed by environmental groups, effectively means the central government will have the final say on the site of the plants.

Italy is the only Group of Eight industrialised nation without nuclear power, but the government of Prime Minister Silvio Berlusconi aims to relaunch it and have a quarter of all power in the country generated by nuclear plants in the future.

Nuclear power was discontinued in Italy nearly 25 years ago after a referendum.

Enel ENEI.MI and France's EDF EDF.PA would like to start building four nuclear power stations in Italy in 2013.

Public opinion in Italy has been generally hostile to nuclear energy and local authorities had demanded a say in their approval. (Editing by Will Waterman)