KIISA ERPP I & II ESTONIA Even in one of the smallest countries in the EU, managing a grid is no easy thing. This is the task of Wärtsilä customer Elering, the Estonian trans- mission system operator (TSO), who is responsi- ble of managing the Estonian electrical grid and operating it in a safe way. A constant, real-time balance between supply and demand is an abso- lute must to keep the grid running and the power reaching customers without

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