Lighten Net Congestion with the Open Source Transformer Thermal Model
Event Recap: FOSDEM 2026
TL;DR
At FOSDEM 2026, Imke de Man and Harm van Leijen presented the open source Transformer Thermal Model. The session explored how modeling transformer hotspot and oil temperatures can help grid operators better understand transformer loading limits, identify acceptable operating conditions, and support efforts to address grid congestion.
Addressing Grid Congestion
The speakers opened by discussing grid congestion in the Netherlands and the need to make effective use of existing grid infrastructure.
They explained that understanding the thermal behavior of transformers can help operators assess how assets perform under different loading conditions and determine acceptable operating limits.
Modeling Transformer Temperatures
The presentation focused on the Transformer Thermal Model, an open source project designed to simulate transformer hotspot and oil temperatures.
According to the speakers, these temperature estimates provide additional insight into transformer behavior beyond loading values alone and can help operators evaluate how transformers respond under different operating conditions.
Exploring Acceptable Load Limits
A central theme of the session was the use of thermal simulations to identify acceptable load limits.
By modeling hotspot and oil temperatures, grid operators can better understand the relationship between loading and transformer thermal performance. The speakers described this approach as one way to support efforts aimed at safely increasing utilization of existing infrastructure.
Why Open Source
De Man and Van Leijen also discussed the decision to release the Transformer Thermal Model as an open source project.
They explained that making the model openly available enables collaboration with other transmission and distribution system operators, researchers, and industry participants facing similar challenges.
The speakers described open source collaboration as a way to strengthen development efforts and share knowledge across the sector.
Building Sector-Wide Collaboration
The presentation emphasized the role of collaboration in improving both the model and the understanding of transformer thermal behavior.
By sharing the project publicly, the team aims to encourage discussion, feedback, validation, and contributions from organizations working on related grid planning and operational challenges.
Getting Involved
The speakers encouraged participants to explore the project repository and contribute through the project’s GitHub community.
They highlighted the Transformer Thermal Model as an example of how open source development can support knowledge sharing and collaboration around electricity grid challenges.
AI Disclosure
This post used artificial intelligence tools for research, structural assistance, or grammatical refinement. The final content was reviewed, edited, and validated by human contributors to LF Energy to ensure accuracy and alignment with our community standards. We remain committed to transparency in the use of generative technologies within the open source ecosystem.
