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.

The Finnish power system is part of the common Nordic power system, together with the systems of Sweden, Norway and Eastern Denmark. In addition, there are high voltage direct current connections from Finland to Estonia, which connect the Nordic system to the Baltic system.

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 2024

The transmission reliability rate in 2024 remained good and was 99.9995% (99.9999%). The average figures for 2014–2023 are given in parentheses.

The volume of electricity not transmitted to consumption totalled 374 (103) MWh and the imputed economic detriment that disturbances caused to consumer customers was EUR 4.7 (2.9) million.

The imputed economic detriment figures are calculated using the parameters of the Energy Authority's new supervision period, which began in 2024, in 2021 monetary values.

The electricity not transmitted corresponded to 5.0 (1.5) MWh per each terawatt hour (TWh) transmitted in Fingrid’s grid.

The energy not received from the power plants to the main grid was 115 (6,034) MWh.

The figure "system minute, SM" was 1.50 (0.44) minutes. One System Minute is equivalent to an interruption of the total system load for one minute at the time of the annual system peak.

The Average Interruption time (AIT) was 2.64 min (0.78 min). The Average Interruption Time is calculated by dividing the energy not supplied by the average power of the system.

The number of forced interruptions ( ≥ 30 sec) per connection point was 0.10 (0.15), and the average forced outage duration was 7.0 (3.7) minutes. There were 257 (249) disturbances, of which 190 (182) 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.