It said it had discovered “oil leaks” in a turbine during a planned three-day maintenance operation, and that the pipeline would remain closed until it was repaired.
Resumption of deliveries via the pipeline which runs from near Saint Petersburg to Germany under the Baltic Sea, had been due to resume on Saturday.
Following the imposition of economic sanctions over the Kremlin’s invasion of Ukraine, Russia has reduced or halted supplies to different European nations, causing energy prices to soar.
The Kremlin has blamed the reduction of supplies via Nord Stream on European sanctions which it says have blocked the return of a Siemens turbine that had been undergoing repairs in Canada.