Loseth told Vattenfall’s board he will not seek to extend his current contract beyond its March 2015 expiry, citing personal reasons.
The board said it will start seeking a successor to Loseth, who has held the job since 2010.
The news of Loseth’s impending departure came as Vattenfall announced third-quarter financial results.
Its wind output was 0.7TWh in the July to September period, unchanged on the equivalent quarter last year.
Vattenfall’s