(Corrects amount in 3rd para to "just over 500 million euros" from "around 520 million euros")
OSLO, Oct 3 (Reuters) - Norway's Equinor has agreed to sell a 25% stake in Germany's Arkona offshore wind farm for around 500 million euros ($547.85 million), almost doubling the value of its investment, the company said on Thursday.
The buyers are funds advised by Credit Suisse Energy Infrastructure Partners, while Equinor will retain a 25% stake, it added.
Since entering the project with a 50% stake in 2016, Equinor has invested just over 500 million euros, a company spokesman told Reuters.
"We're satisfied with this deal and to still remain owner of a 25% stake," Equinor spokesman Eskil Eriksen said.
Arkona is operated by RWE Renewables, which holds a 50% stake.
"This divestment demonstrates Equinor's ability to realise value from the development of offshore wind projects. Active portfolio management through the project life cycle is an important part of our offshore wind strategy," said Paal Eitrheim, head of Equinor's New Energy Solutions unit. ($1 = 0.9127 euros) (Reporting by Terje Solsvik Editing by Raissa Kasolowsky)