Supply security of electricity

Fingrid is to deliver the electricity produced by power plants connected to the national grid to Fingrid's customers reliably and with good quality. Fingrid also exports and imports power with the neighbouring countries. The supply security of electricity is maintained continuously. The indicators monitored include the number and duration of outages.

The transmission grid is planned and operated so that no individual fault leads to an escalating disturbance, which influences the entire transmission grid.

Transmission reliability in the Finnish national grid in 2019

Transmission reliability rate reached again a good value 99.9998 % (99.9998 %). The average figures for 2009–2018 are given in parentheses.

The volume of electricity not transmitted to consumption totalled 173 MWh (148 MWh) and calculated economic damage for consumer customers caused by disturbance outages was EUR 5.2 million.

The electricity not transmitted corresponded to 2.5 MWh (2.2 MWh) per each terawatt hour (TWh) transmitted in Fingrid’s grid. The energy not received from the power plants to the grid was 178 MWh. The calculated damage of the energy not received from generation to the grid was 10 000 €.

The key figure "system minute" often used in international comparisons to describe transmission reliability had a value of 0.71 (0.61) min. A system minute refers to the interruption of all transmission for one minute compared to the annual peak demand of the system.

The number of forced interruptions (over 30 sec) per connection point was 0.18 (0.22), and the average forced outage duration was 4.3 minutes (4.3 min). There were 227 disturbances (269), of which 161 (172) were caused by thunder or other natural phenomena.

Annual reports on the Finnish main grid and the Nordic and Baltic fault statistics can be found in the menu on the left side of the page.



Markku Piironen

Operational Development
tel. + 358 30 395 4172