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35 55 Reliability of the Finnish power system The power system has to withstand a fault in any individual component (N-1) Transmission network reliability 100,0000 % • The main reasons for disturbances have been lightning and other weather related 99,9998 % incidents (storms) 99,9996 % • Major part of the disturbances are cleared with automatic reclosure schemes without 99,9994 % any manual switching operations 99,9992 % • The average duration of the connection point outages is usually a couple of minutes per year 99,9990 % The reliability of the Finnish power system is top class Fingrid Debt Investor Presentation 30.9.2018 2005 2007 2009 2011 2013 2015 2017 FINGRID

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