The end of August was an historic moment at Alajärvi substation, as the last air blast circuit breakers in the main grid were removed from use as part of the substation renewal project. Project Manager Sami Mäki and Expert Heikki Porkka, who planned the transmission outages, have been involved in the different stages of this substation.
Fingrid wanted to improve the availability and reliability of HVDC interconnections to a level that matched the importance of these cross-border connections. Major improvements in 2016 cut the number of outages ‘due to disturbances’ in half and reduced their duration to less than one-tenth of the average in previous years. How did Fingrid achieve such a fine outcome?