N-SIDE and Svenska kraftnät, the Swedish TSO, are collaborating on the development of a new approach for the dimensioning of balancing capacity.
![<p data-prosemirror-content-type="node" data-prosemirror-node-name="paragraph" data-prosemirror-node-block="true" data-pm-slice="1 1 ["table",{"displayMode":null,"isNumberColumnEnabled":false,"layout":"center","localId":"6ad488e0-fd3b-48a6-9413-4a7eeac8ae32","width":1268,"__autoSize":false},"tableRow",{},"tableCell",{"colspan":1,"rowspan":1,"colwidth":[218],"background":null}]">N-SIDE and Svenska kraftnät, the Swedish TSO, are collaborating on the development of a new approach for the dimensioning of balancing capacity.</p>](https://cms.n-side.com/thumbor/BwzkhKjIRVpWvswnnpG8cUMVjiw=/fit-in/1024x/filters:quality(92)/--/uploads/2025/09/N-SIDE-and-Svenska-kraftnat-the-Swedish-TSO-are-collaborating-on-the-development-of-a-new-approach-for-the-dimensioning-of-balancing-capacity.png)
Unlike other European countries performing individual dimensioning, the four Nordic TSOs require a common FRR dimensioning methodology to exploit the synergies of the Nordic synchronous system and they strive for the additional benefits of a common Load-Frequency Control (LFC) Block.
This makes the sizing of reserves particularly challenging, due to the multi-area aspect and the possible congestion in the links connecting these 11 LFC areas.
The Swedish TSO, Svenska kraftnät, has contracted N-SIDE to develop a reference model and a methodology for the sizing of reserves in the Swedish control area, leveraging N-SIDE’s expertise in balancing capacity dimensioning and thorough knowledge of the Swedish context.
During the project, various potential approaches have been identified following a state-of-the-art literature review and a qualitative CBA. The methods have been evaluated against several criteria including computational complexity, data requirements, or regulatory compatibility. In the last phase of the project, N-SIDE has implemented a proof-of-concept model of the dimensioning of aFRR and mFRR reserves for the four LFC areas in Sweden, based on a mixed-integer linear programming (MILP) model. Svenska kraftnät and N-SIDE are currently investigating possibilities to expand the model further, including dynamic approaches for instance.
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