* Mapna to manufacture Siemens F-class gas turbines under licence

* Siemens CEO says deal reestablishes partnership with Mapna

* CEO Kaeser visited Iran last week

(Adds details on Siemens history in Iran, longer-term deal)

FRANKFURT, March 2 (Reuters) - German industrial group Siemens signed an energy agreement with Iranian power and infrastructure group Mapna, it said on Wednesday, extending its early re-entry into the country after the lifting of sanctions.

Siemens was the first major German company to agree a deal with Iran this year, signing a memorandum of understanding to work on Iran's rail infrastructure worth up to 1.5 billion euros ($1.6 billion) in early January.

Mapna will acquire the technology to manufacture Siemens F-class gas turbines in Iran and the two parties will cooperate to deliver more than 20 gas turbines and associated generators over the next decade.

"With these important agreements we reinstall the long-term energy partnership between Mapna and Siemens," said Siemens Chief Executive Joe Kaeser, who witnessed the signing during a visit of Iranian Energy Minister Hamid Chitchian in Berlin.

Kaeser visited Iran last week and said Siemens wanted to pick up where it left off in Iran, where it had been present since 1868 but stopped doing new business in 2010.

As a first project under the energy deal, Siemens will deliver two F-class gas turbines and generators for a power plant in the southern port of Bandar Abbas, with the first unit due to be shipped shortly.

Siemens also signed a memorandum of understanding to jointly develop a roadmap with Mapna to expand and improve Iran's overall power and electricity system.

($1 = 0.9212 euros)

(Reporting by Georgina Prodhan; Editing by Christoph Steitz and David Holmes) ((georgina.prodhan@thomsonreuters.com; +49 69 7565 1279; Reuters Messaging: georgina.prodhan.thomsonreuters.com@reuters.net))