The legal action coincides with government curbs on output after earthquakes in the Netherlands, home to the European Union's largest gas field, which turned it into a net importer of the fuel. Utilities from Germany's RWE AG to Turkey's Botas Boru Hatlari Ile Petrol Tasima AS filed arbitration claims against Gazprom PJSC's export unit after market prices fell below contract rates, with EON SE and Engie SA settling cases with Europe's biggest gas supplier this year.