MILAN, June 14 (Reuters) - Italian energy group Eni has intensified talks with several investors over a potential sale of a minority stake in its renewables and retail business Plenitude, three sources with knowledge of the matter said on Wednesday.

Two of the sources said that Eni is working on a disposal of between 5% and 15% of Plenitude and could even do a deal before Italy's summer break, which is normally in August.

Plenitude, which last year recorded an adjusted operating profit of 345 million euros, could be valued at more than 6 billion euros ($6.5 billion) in the private transaction, one of the sources said.

Eni declined to comment.

A sale of a small stake in Plenitude would give a value to the business, creating the conditions for a future listing.

Eni had to freeze an initial public offering (IPO) of Plenitude in June 2022 due to adverse market conditions but has not stopped talking with investors over a potential private sale of a stake.

A new attempt to list Plenitude could be launched at the end of this year or more probably in 2024, the sources said. ($1 = 0.9217 euros) (Reporting by Francesca Landini in Milan, Ron Bousso in London; Editing by Alexander Smith)