One silver lining, according to Buller, could be the lower cost of future maintenance after Siemens Energy fixes the current problems. "All our analysis from the very beginning was done assuming Siemens Gamesa was worth nothing," Cutler told CNBC Pro. Siemens Energy's new U.S. factory, which isn't ready yet, has sold out its manufacturing capacity for the next two years. said Chris Smith, fund manager of Artisan Focus Fund, which owns stakes in both GE Vernova and Siemens Energy. Siemens Energy's share price move this year has also been in spite of the lackluster performance in its wind turbine division.

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Persons: Christian Bruch, Philip Buller, Gamesa, Ingo Speich, Speich, Berenberg's Buller, Buller, Alec Cutler, Cutler, Gael, Vernova, Chris Smith, Smith Organizations: Siemens Energy, JPMorgan, Jefferies, Citi, UBS, Santander, Deka Investment, Siemens, CNBC Pro, Deka Investments, CNBC, Gael de, Deutsche Bank, GE Vernova, Systems, ABB, Hyundai, GE, General Electric, New York Stock Exchange, Siemens AG, Artisan Focus Locations: ENRN, Munich, Gamesa, Bray, European, South, U.S, Europe