PARIS, Aug 4 (Reuters) - Power supply has been reduced by a gigawatt (GW) at the 1.3 GW Golfech 2 reactor operating in south western France due to environmental issues, and is expected back at full capacity on Aug. 8, nuclear operator EDF said in a notice.

EDF has issued rolling warnings in recent weeks for the plant due to high river temperatures.

"In the event of an exceptional situation, RTE may request higher power," the notice said. RTE is the French network operator. (Reporting by Forrest Crellin; Additional reporting by Bangalore; Editing by Jan Harvey)