Supply security of electricity

Fingrid is to transmit 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 amongst other things the number and duration of disturbance 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 2021

The transmission reliability rate in 2021 remained high and was 99.99992% (99.99980%). The average figures for 2010–2020 are given in parentheses.

The volume of electricity not transmitted to consumption totalled 61 MWh (137 MWh) and calculated economic damage for consumer customers caused by disturbance outages was EUR 5,8 million (6.3 million).

The electricity not transmitted corresponded to only 0.8 MWh (2.0 MWh) per each terawatt hour (TWh) transmitted in Fingrid’s grid. The energy not received from the power plants to the grid was 184 MWh. The calculated damage of the energy not received from generation to the grid was 26,000 €.

The key figure "system minute" often used in international comparisons to describe transmission reliability had a value of 0.26 (0.57) 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 0.19 (0.19), and the average forced outage duration was only 0.9 minutes (4.1 min). There were 276 disturbances (262), of which 196 (187) were caused by thunder or other natural phenomena. The weather caused 71% (71%) of all disturbances.

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