Fingrid Updates Simulation Model Requirements – What the Changes Mean for Grid Energy Storage and Power Generation Connections
On February 10, 2026, Fingrid published updated instructions for PSS/E and PSCAD simulation models for Type C and D grid energy storage systems and power generating facilities. The changes will come into force gradually during spring and autumn 2026.
Why the update now?
The Finnish power system is becoming increasingly converter-dominated. As significant amounts of converter-based generation technology are integrated into the grid, it becomes even more critical for Fingrid to have accurate simulation models that realistically represent the functionalities of these facilities.
Providing simulation models is a key part of the verification process for grid code compliance. The updated instructions have been developed in cooperation with Nordic transmission system operators Statnett, Svenska kraftnät, and Energinet.
What changed?
Previously, Fingrid had joint modeling instructions for both PSCAD and PSS/E simulation models. In the new version, the instructions have been separated, and each simulation tool now has its own independent instruction document. This clarifies requirements and makes modellers’ work easier.
Additionally, there are updates to the required functional tests. While individual additions may seem minor, each new test in the simulation environment can cause challenges in finalizing the model. Fingrid requires a fully functional model, making even seemingly small changes significant.
Who is affected and when?
The updated instructions enter into force as follows:
- Stage 1 projects: Apply to projects for which specific study requirements are given after February 10, 2026, or for which the model is submitted to the Oma Fingrid platform for the first time after September 1, 2026.
- Stage 2 projects: Apply to projects for which the model is submitted for the first time after October 1, 2026. Note that Stage 2 models can only be submitted after commissioning tests.
Models submitted before these deadlines must be accompanied by a test list showing that the model fulfils the relevant grid code (SJV/VJV) functional requirements.
What does this mean for your projects?
While requirements have not significantly tightened – particularly in Finland, where the requirement level has already been stringent – some additional functional tests have been introduced. This means increased workload during the modeling phase, as each additional test requires careful implementation and verification. It’s important that project stakeholders are aware of the updates and can account for them in their projects.
In Sweden, the changes may pose greater challenges, as PSCAD requirements have only been in use for about a year and a half, and Svenska kraftnät has not previously set requirements as clearly.
Nordic harmonization matters
These updated PSCAD instructions represent an important step toward harmonized modeling practices across the Nordic region. For developers working on multi-country projects or planning cross-border connections, this alignment simplifies compliance and reduces uncertainty.
Ampner’s perspective
The updated modeling requirements underscore the importance of accurate simulation in grid connection projects. At Ampner, we have strong expertise in both PSCAD and PSS/E modeling and help our clients navigate these requirements efficiently.
If your project involves submitting simulation models to Fingrid, we recommend familiarizing yourself with the updated instructions well in advance and ensuring that your models meet the new requirements.
More information: Fingrid’s updated modeling instructions and test lists can be found on Fingrid’s website: Modeling instructions
