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​​​​​​​​​​​​​​​​​​​​The below reports and publications concern ENTSO-E’s Nordic region.


Agreements and Principles











Nordic report Future system inertia

Power system inertia is defined as the ability of a power system to oppose changes in system frequency due to the resistance provided by rotating masses. Inertia is dependent on the amount of kinetic energy stored in rotating masses connected to the power system. The Nordic power system will change in the years to come - renewable production will replace old condensing power plants, and production units and HVDC-connections become larger. This will result in greater imbalances that will arise and lead to potentially larger frequency deviations.

The Nordic Analysis Group (NAG) initiated the project "Future system inertia" in Autumn 2013 and the project proposal was approved by Regional Group Nordic (RGN) in November 2013. This project has been an initial attempt to get a better understanding of the variation of inertia in the Nordic power system, with the aim to understand how future changes will impact the inertia. Efforts were made to analyse historical frequency disturbances and to estimate the consequences of reduced inertia on frequency disturbances. One achievement of this work has been the development of an online tool for estimating kinetic energy in the Nordic power system.

The project team was composed of experts from Energinet.dk, Fingrid, Statnett and Svenska kraftnät.

Download the Nordic report on future system inertia

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