Oct 19 (Reuters) - France's Channel tunnel operator Getlink on Thursday posted a slight rise in third-quarter revenue, driven by the good performance of its Eurotunnel and Europorte business.

Getlink, formerly known as Eurotunnel, posted revenue of 472.5 million euros ($497.59 million) for the three months to September, up 1% from 466.3 million euros in the year-ago period.

The group's Eleclink unit, an underwater cable enabling electricity exchange between France and the U.K. launched in May 2022, showed a 11% decrease in revenue at 96 million euros, which Getlink attributed to the reduction in Franco-British spreads on the electricity markets.

Getlink collects its cut from every passenger travelling to Paris, Brussels and London, through the high-speed train Eurostar.

"The attractiveness of the Channel Tunnel was reaffirmed with Evolyn's decision to launch a new high-speed passenger train service between Great Britain and continental Europe from 2025, confirming the strong growth potential of low-carbon cross-Channel traffic", CEO Yann Leriche said in a statement.

Eurostar's monopoly on cross-channel traffic has been threatened earlier this month by the purchase of 12 trains from Alstom for its planned high-speed rail service under the English Channel. ($1 = 0.9496 euros) (Reporting by Nathan Vifflin and Augustin Turpin; Editing by Muralikumar Anantharaman and Kim Coghill)