Power system

Electricity consumption in Finland totalled 85.5 (85.1) terawatt hours in 2017. A total of 66.2 (68.5) terawatt hours of electricity was transmitted in Fingrid's grid, representing 75.5 (77.3) per cent of the total transmission volume in Finland (consumption and inter-TSO).

The electricity import and production capacity was sufficient to cover the peak consumption during the year. Electricity consumption peaked at 14,300 megawatts on 5 January 2017 between 5 and 6 p.m. During that peak consumption hour, Finland generated 10,000 megawatts of electricity, and the remaining electricity was imported from neighbouring countries. On the same day, a record-high 4,750 megawatts of electricity was imported. The availability of electricity in Finland was not in danger even during peak consumption periods, and peak load capacity was not used during the consumption peak.

Electricity transmissions between Finland and Sweden consisted mostly of large imports to Finland. In 2017, 15.6 (15.7) terawatt hours of electricity was imported from Sweden to Finland, and 0.4 (0.3) terawatt hours was exported from Finland to Sweden. The electricity transmissions between Finland and Estonia were mainly exports to Estonia, amounting to 1.7 (3.1) terawatt hours. Imports from Estonia amounted to 0.9 (0.7) terawatt hours. Electricity imports from Russia remained on the previous year’s level, at 5.8 (5.9) terawatt hours. Nearly the full transmission capacity was available. In 2017, 0.3 (0.2) terawatt hours of electricity was imported from Norway to Finland, and 0.0 (0.1) terawatt hours was exported from Finland to Norway.

The transmission reliability rate remained at an excellent level and was 99.9997 (99.9999) per cent. An outage in a connection point in the grid caused by a disturbance in Fingrid’s electricity network lasted an average of 2.2 (1.4) minutes, which is clearly shorter than the ten-year average. The cost of the disturbances (regulatory outage costs) was EUR 2.8 (3.1) million and, including the quick reconnections, EUR 5.0 million. The most significant single disturbance took place in December 2017 at the Porvoo-Ahvenkoski 110-kilovolt power line, when abundant snow damaged the tower structure and the lightning conductor. 
 
The reliability of direct-current connections was on a record-high level in 2017. There were only four disturbances in Fingrid’s four direct-current connections, the total duration of which was only around 10 hours. The total availability of the connections reached its highest level in five years. Thanks to high reliability and availability, countertrade costs declined considerably. Disturbances in direct-current connections did not have any impact on the transmission capacity available to the electricity market.

The volume of transmission losses in the Finnish grid decreased from the previous year and was 1.2 (1.3) terawatt hours. This is 1.4 (1.4) per cent of the total volume of transmitted electricity. The decrease is attributable to a decline in ITC volumes from the previous year. The annual variation of losses is affected by the situation of Nordic electricity production, particularly the great variation in hydro power production. Losses have been minimised by keeping the voltage of the transmission grid as high as possible and by making grid investments and equipment procurements that promote energy efficiency.

Counter trade Jan-Dec/17 Jan-Dec/16 July-Dec/17 July-Dec/16
Counter-trade between Finland and Sweden, €M 0.4 2.5 0.1 1.1
Counter-trade between Finland and Estonia, €M 0.1 0.1 0.0 0.0
Counter-trade between Finland's internal connections, €M 1.3 1.2 0.0 0.4
Total counter-trade, €M 1.8 3.9 0.1 1.5
         

Reserves required to maintain the power balance of the electricity system were procured from Finland, the other Nordic countries, the Baltic countries and Russia. Countertrade costs amounted to EUR 1.8 (3.9) million. Countertrade refers to special adjustments made in the management of electricity transmission which are used to eliminate short-term bottlenecks (congestion in electricity transmission caused by the transmission grid) from the grid. Fingrid guarantees the cross-border transmission capacities between countries it has confirmed by carrying out countertrades, i.e. purchasing and selling electricity, up until the end of the 24-hour usage period. The need for countertrade can arise from, for example, a power outage or disruption in a power plant or in the grid. 

Power system operation Jan-Dec/17 Jan-Dec/16 July-Dec/17 July-Dec/16
Electricity consumption in Finland TWh 85.5 85.1 41.8 41.5
TSO transmission in Finland, TWh 2.1 3.5 1.3 0.9
Transmission within Finland, TWh 87.6 88.6 43.1 42.4
Fingrid's transmission volume TWh 66.2 68.5 33.4 33.2
Fingrid's electricity transmission to customers, TWh 63.9 64.9 32.0 32.2
Fingrid's loss energy volume TWh 1.2 1.3 0.6 0.6
Electricity transmission Finland - Sweden        
Exports to Sweden TWh 0.4 0.3 0.3 0.3
Imports from Sweden TWh 15.6 15.7 8.1 6.8
Electricity transmission Finland - Estonia        
Exports to Estonia TWh 1.7 3.1 1.1 0.6
Imports from Estonia TWh 0.9 0.7 0.3 0.6
Exports to Norway TWh        
Imports from Norway TWh 0.0 0.1 0.0 0.0
Imports from Norway TWh 0.3 0.2 0.2 0.1
Electricity transmission Finland - Russia        
Imports from Russia TWh 5.8 5.9 2.8 2.9