LF Energy Summit Europe 2026: Full Schedule

15 - 16 September | Berlin, Germany
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Note: The schedule is subject to change.

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10:30 CEST

PowSyBl: TSO Cooperation Through Building Blocks - Nicolas Omont, Artelys & Alice Caron, RTE

Tuesday September 15, 2026 10:30 - 11:00 CEST

Waldbühne

During the last years, the PowSyBl ecosystem has expanded in many directions around the core module dedicated to grid data management, allowing the collaboration of an increasing number of organisations. As the workhorse of power systems, Open Load Flow is leading the adoption cycle with live projects for load flow, security analysis or sensitivity analysis at many TSOs and Coordination Centers. The advanced optimization tool OpenRAO is also a leading operational remedial action optimizer in Europe. Beyond computation modules, many users also adopted PowSyBl thanks to its easiness of use in day-to-day scripting through the python interface, and to grid and substation visualization features. The technical ecosystem is also widening with projects like the dynamic simulation module Dynawo and the grid study platform GridSuite. These last projects are open-source and are an open invitation to start cooperation. The session will provide an overview of the ecosystem, providing, for each module, the main features and use cases, the maturity status, and the roadmap. Eventually, through some examples, the way PowSyBl governance allows to start new cooperations will be presented.

Speakers

Nicolas Omont

VP Operations, Artelys

Nicolas Omont has more than 15 years of experience in Power Systems computation as an expert and a project manager. At Artelys and at RTE R&D department, he managed R&D projects to develop Power Systems tools for CIM CGMES data management, security analysis, remedial action optimization... Read More →

Alice Caron

Powsybl product owner, RTE

Work at RTE in the software development department. Started as a developer and then tech lead for 4 years and now working on the Powsybl project for 1year now as a product owner.

Tuesday September 15, 2026 10:30 - 11:00 CEST
Waldbühne

Modeling, Session Presentation

10:30 CEST

Tools for Facilitating Dynawo Usage - Jose Luis Marin, AIA ; Marco Chiaramello, RTE, Réseau de Transport d’Électricité; Clara Fernández Castañer, APLICACIONES EN INFORMATICA AVANZADA; Guiu Oms Font, AIA

Tuesday September 15, 2026 10:30 - 12:10 CEST

Back Stage

Dynawo is an Open-Source, production-level dynamic simulator developed by RTE, now in use for operations planning processes. It is also the reference tool for validating the compliance of new projects to grid code requirements in France. Dynawo comes with an extensive library of RMS models written in Modelica, including a complete suite of generic models (WECC, IEC) for inverter-based resources.

This Tutorial will benefit anyone who is interested in using and/or extending Dynawo's *model library* but is finding that Dynawo (the *simulator*) has a steep learning curve. In particular, we will be presenting new tools designed for facilitating the uptake of Dynawo's models, demonstrating a few use-cases:
* Usage within pure Modelica: solving the initialization problem
* Usage of Dynawo via PyPowSyBl: construction, manipulation, and visualization of (large) study cases
* Parameter-sweep studies
* Small-stability analysis

The tools take the form of Python and Julia Notebooks, designed to be flexible and easy to change by end-users. The session will also emphasize *understanding* these tools to encourage the customization and promote new creative solutions.

Speakers

Guiu Oms Font

AI/ML Software Engineer, AIA

Guiu is an AI/ML Software Engineer with 5 years of experience deploying AI solutions, specializing in electric network simulation and validation. A top-ranked computer science graduate, their core expertise includes machine learning algorithms, deep learning, and computer vision... Read More →

Clara Fernández Castañer

Junior Consultant, APLICACIONES EN INFORMATICA AVANZADA

Clara Fernández Castañer holds a Ph.D. in Theoretical High Energy Physics from the Autonomous University of Barcelona. She is a consultant at Grupo AIA, where she works on R&D projects for the electric power sector, developing tools for power system modeling, simulation, and analysis... Read More →

Tuesday September 15, 2026 10:30 - 12:10 CEST
Back Stage

Modeling, Tutorial Sessions

11:05 CEST

PowSyBl: A Service Provider Business Model - Nicolas Omont, Artelys

Tuesday September 15, 2026 11:05 - 11:15 CEST

Waldbühne

This session presents Artelys' vision of a sustainable business model around the PowSyBl open-source framework for power system modelling.

The approach relies on a clear separation between strategic governance, technical steering and community contributions, enabling transparency and alignment across stakeholders (TSOs, RCCs, utilities, vendors). The roadmap is not imposed by a vendor but co-defined by contributors and users, who can influence priorities through governance bodies and structured collaboration.

From a business perspective, value is created through services: integration, custom developments, and especially long-term support & maintenance of shared modules. This model leverages mutualization: several users co-finance core components, ensuring sustainability of complex software while avoiding vendor lock-in.

The session will illustrate how open-source approach enables both flexibility for individual projects and efficiency at ecosystem scale.

Speakers

Nicolas Omont

VP Operations, Artelys

Tuesday September 15, 2026 11:05 - 11:15 CEST
Waldbühne

Modeling, Lightning Talk

11:15 CEST

Generation and Load Interconnection Studies in the US Using PowSyBl - Dio Stamatiadis, Piq Energy

Tuesday September 15, 2026 11:15 - 11:25 CEST

Waldbühne

Capacity screening studies help US generation and large-load developers evaluate project size against available network capacity. Once a project size is selected, system impact studies determine project-specific impacts and upgrade costs. Developers often need to run tens or hundreds of sensitivities to understand risk, compare sites, and navigate the interconnection process, making scale, speed, and accuracy critical. In the US, these studies are most commonly performed with commercial planning software. While open-source alternatives exist, they are still rarely used in industry-grade workflows.

We will show how we are incorporating PowSyBl into our power system analysis platform as an alternative engine for US studies. We will cover why we selected PowSyBl after evaluating other open-source options, what it took to adapt it to US planning conventions, how its results compare with commercial tools, and lessons learned bringing open-source power-system analysis into production workflows. We will also discuss where we plan to extend its use next, including broader study coverage, deeper workflow integration, and contributions back to the ecosystem.

Speakers

Dio Stamatiadis

Co-Founder and Chief Engineer, Piq Energy

Dio is co-founder and chief engineer at piq energy, where he builds power system analysis software for grid connection, renewable energy, large-load, and data centre integration studies. He has over 10 years of experience across power systems, automation, cloud infrastructure, data... Read More →

Tuesday September 15, 2026 11:15 - 11:25 CEST
Waldbühne

Modeling, Lightning Talk

11:25 CEST

How To Industrialize an Open Source Approach Around PowSyBl - Régis Le Drézen, Agnès Triponel & Sébastien Dinot, Sopra Steria

Tuesday September 15, 2026 11:25 - 11:35 CEST

Waldbühne

Transmission system operators face structural challenges: sovereignty, security, safety, efficiency, digitalization …
In this session, Sopra Steria shares a practitioner’s journey of embedding LF Energy’s PowSyBl into a real TSO production program for RTE. We cover two concrete contributions shipped to the open source community: decoupling the network-viewer component from any frontend framework (React/Angular agnostic), enabling simultaneous dual-value display (P active and Q reactive) on grid lines. Beyond the code, we discuss how an IT company structures its OSPO, open source governance (Licence Rules Book), and the cultural shift required to move from “consumer” to “contributor” in a critical infrastructure context.

Speakers

Régis Le Drézen

Partner Energy, Sopra Steria

Régis Le Drézen is a recognized expert in smart grids and energy transition. With over 20 years of experience at EDF, RTE and Enedis, he has led major innovation and infrastructure programs, including Smart Grid Vendée and e-mobility initiatives. Former Managing Director of Think... Read More →

Sébastien Dinot

Free and Open Source Expert, CS – Sopra Steria

Sébastien Dinot has been involved in open source software since 1998. He provides CS GROUP’s teams and clients with support across the four dimensions—technical, legal, social, and economic—of open source software. He helps them publish their open source projects, develop their... Read More →

Agnès Triponel

Scrum Master and Operational Project Manager, Sopra Steria

Scrum Master and project manager with 4 years of experience, I have built my career working on data, network, and cybersecurity projects, notably with major energy players such as Enedis and RTE. I operate in environments where agility plays a central role, often at the heart of transformations... Read More →

Tuesday September 15, 2026 11:25 - 11:35 CEST
Waldbühne

Modeling, Lightning Talk

11:40 CEST

Scaling Grid Security With Open Source - Hugo Pfister & Jorn van der Landen, TenneT Netherlands

Tuesday September 15, 2026 11:40 - 12:10 CEST

Waldbühne

The power grid is changing fast, and the systems behind it are under pressure. More data, tighter timeframes, increasing congestion, and regulatory requirements are pushing traditional grid security tools beyond their limits. At TenneT Netherlands, legacy tooling was simply no longer fast and adaptable enough to keep up with this new reality.

By combining the open source PowSyBl framework with a cloud-native orchestration platform (ReFlow), TenneT rebuilt its grid security analysis from the ground up. The result is a step change in performance and capability: reducing calculation runtimes from minutes to seconds and enabling a fundamentally different way of working.

This session will show how we:

- Moved from monolithic legacy tooling to a modular, scalable architecture
- Used open source to accelerate delivery and avoid vendor lock-in
- Established what it takes to run open source in a mission-critical environment
- Strengthened operator support by providing an integrated view across analyses through modular design

Speakers

Hugo Pfister

Manager Systems & Markets, TenneT Netherlands

Hugo Pfister is a people and technology leader at TenneT Netherlands, focused on simplifying complexity in mission-critical systems to enable effective, scalable, and innovative ways of working. He is an active open source advocate, driving adoption within TenneT and across international... Read More →

Jorn van der Landen

Business IT Specialist, TenneT Netherlands

I work as a Business IT Specialist within the Grid Security domain at TenneT, where I focus on connecting business, IT, and innovation. I am passionate about driving new technological developments and believe in a fit-for-purpose approach, where capabilities, flexibility, and speed... Read More →

Tuesday September 15, 2026 11:40 - 12:10 CEST
Waldbühne

Modeling, Session Presentation

13:10 CEST

A Hands-on Open-source Dynamic Simulation Tutorial Using VeraGrid - Andres Mauricio Díaz Caicedo & Pablo de Juan Vela, eRoots Analytics; Marina Rosés Gibert & Marina Sans Esqué

Tuesday September 15, 2026 13:10 - 14:50 CEST

Back Stage

This hands-on tutorial will introduce VeraGrid’s open-source dynamic simulation capabilities for modern power system studies. Participants will learn how to build, run, and interpret dynamic simulations using both GUI-based and scripting workflows, making the session accessible to users with different levels of coding experience.

The tutorial will cover RMS simulation, EMT simulation, and small-signal analysis at both RMS and EMT levels. Attendees will work with out-of-the-box dynamic model templates and see how these can be extended into customized control builds for specific applications. They will also create simulation events and visualize their effect on system behaviour.

Speakers

Marina Sans Esqué

Unknown Title, Unknown Company

Maria holds a BSc in Industrial Engineering and a Double MSc in Industrial and Energy Engineering from UPC-ETSEIB. Her work has focused on small-signal analysis in the RMS framework and EMT simulation foundations in VeraGrid. She is currently advancing VeraGrid’s dynamic solver... Read More →

Pablo de Juan Vela

Development engineer, eRoots Analytics

Pablo holds BSc degrees in Mathematics from UPC-FME and Industrial Engineering from UPC-ETSEIB, completed in 2021. He earned an MSc in Mathematical Optimization from Université Paris-Saclay in 2022. His master’s thesis at EDF R&D focused on robust control for EV charging. Since... Read More →

Andres Mauricio Díaz Caicedo

Power Systems Solutions Architect, eRoots Analytics

Andrés Mauricio Díaz Caicedo is a Power Systems Solutions Architect and Industrial PhD candidate at eRoots. He previously served as Dynamic Modelling Lead at a global engineering consultancy and as Economic Dispatch Analyst at XM, the Colombian ISO, where he led Protection and Control... Read More →

Tuesday September 15, 2026 13:10 - 14:50 CEST
Back Stage

Modeling, Tutorial Sessions

14:05 CEST

Dynaωo: Exploring Open-Source Real-World Dynamic Simulation Capabilities for Power Systems - Gilles Aouizerate, Joy El Feghali,Florentine Rosiere & Marco Chiaramello, RTE, Réseau de Transport d’Électricité

Tuesday September 15, 2026 14:05 - 14:50 CEST

Elektro Stage

Join this demo session to explore Dynaωo, an open-source suite of time domain simulation tools for power systems. Through real-world use cases at full grid scale, we will showcase the tool’s current capabilities, including its ability to model complex grid behaviors, simulate disturbances, and analyze system stability. We will demonstrate how both academic and industrial users can quickly get started with Dynaωo, enabling them to leverage its powerful time domain simulation capabilities for their specific needs.
This session will highlight Dynaωo’s integration with PowSybl, another open-source tool under the Linux Foundation Energy umbrella, to demonstrate how seamless interface enhances workflows for researchers and industry professionals. Attendees will gain hands-on insights into Dynawo’s modular architecture, its flexibility for customization, and its potential for industrial applications.
Whether you are a developer, researcher, or grid operator, this demo will illustrate how Dynaωo can support your dynamic simulation needs while fostering collaboration within the open-source energy community.

Speakers

Marco Chiaramello

Dr, R&D project manager, RTE, Réseau de Transport d’Électricité

Dr. Marco Chiaramello has worked in RTE’s R&D Department since 2017 and has led research on transmission grid modelling and simulation since 2023. His work addresses the transformation of power systems driven by HVDC links, advanced protection schemes, and power-electronic-interfaced... Read More →

Florentine Rosiere

R&D engineer, RTE

Florentine Rosiere is a Computer Engineer at RTE, where she contributes to the development of Dynawo, an open-source dynamic simulation suite used operationally for power system studies. With 15 years of experience in software engineering, she is involved in software design, implementation... Read More →

Gilles Aouizerate

R&D Engineer, RTE

Gilles Aouizerate is a R&D Engineer at RTE, where he contributes to the development of Dynawo, an open-source dynamic simulation suite, used at an industrial scale. With 15 years of experience in simulation software development, he specializes in dynamic simulators for energy systems... Read More →

Joy El Feghali

Research engineer in Power System modelling and simulation, RTE

Joy El Feghali holds a ph.D. degree in Control from Paris-Saclay University. She also holds a master’s degree in
control and signal processing from CentraleSupelec, Paris-Saclay University, and has an electrical engineering
background.
She currently works at the R&D department of RTE, the French TSO. She is mainly developing power system models for the Dynawo suite simulation tools for transient and converter stability studies using the Modelica language... Read More →

Tuesday September 15, 2026 14:05 - 14:50 CEST
Elektro Stage

Modeling, Demo Sessions

15:20 CEST

Bringing Open Energy Models To GIS: Interoperability With ESDL in ArcGIS and QGIS - Thomas van Dijk, TNO

Tuesday September 15, 2026 15:20 - 16:05 CEST

Sonnendeck

We present how the open Energy System Description Language (ESDL) is translated into GIS environments to enable interoperable and transparent spatial energy planning, across domains. ESDL is a modelling language designed to represent multi-carrier energy system components, their relationships, and dynamic behavior, while structuring assets, network topologies, and scenarios in a consistent way.

In the Netherlands the spatial dimension of the energy transition is critical and diverse stakeholders (grid operators, municipalities, industry, and modelers) have to exchange, aggregate, and iteratively refine energy scenarios. This makes a shared standard, that connects different models across domains (e.g. heat, gas and electricity) and seamlessly links to GIS, important.
In this session, we demonstrate how Esri and ArcGIS are integrating ESDL and explore what this means for interoperability and the open-source ecosystem. How can a leading GIS platform evolve into an open environment for open energy simulation models?

We will share the latest status of ESDL integration in both ArcGIS and QGIS, including practical examples such as hydrogen network simulations: https://arcg.is/9rP0y

Speakers

Thomas van Dijk

Digital Energy Business Developer, TNO

Thomas has wondered most of his career how global challenges can be solved collectively. From a battery start-up, microgrids to an opensource NGO, he works at TNO since 2025, a Dutch research organization, to bring their long history of public collaborative innovation in the energy... Read More →

Tuesday September 15, 2026 15:20 - 16:05 CEST
Sonnendeck

Modeling, Birds of a Feather Sessions

15:20 CEST

PyPowSyBl Demonstration : Core and New Features - Hugo Kulesza, RTE (Réseau de Transport d'Electricité) & Federico Naranjo, Artelys

Tuesday September 15, 2026 15:20 - 16:05 CEST

Elektro Stage

PowSyBl is becoming more and more widely used by the power grid community. PyPowSyBl is the entry point to this ecosystem for a lot of users, bringing most of the functionalities of PowSyBl to Python development.

We propose to demonstrate both the core features of the package (network manipulation, loadflow computation, security or sensitivity analysis, visualization...) and give a glimpse into the more recently added features.

It will allow both new members of the community to discover how PyPowSyBl works and members already using it to know more about features they might not use and new ones.

Speakers

Federico Naranjo

Power System Consultant, Artelys

Power systems consultant at Artelys (Madrid), holding a MSc in Energy Engineering from KU Leuven and KTH. Specialises in grid simulation, security analysis, and energy market integration, leading computational module development for European regional coordination centres. Supports... Read More →

Hugo Kulesza

Software Engineer, RTE (Réseau de Transport d'Electricité)

Hugo Kulesza has been working at RTE since his graduation as engineer from ISAE-Supaero in 2022. He contributed from the start on PyPowSyBl and other PowSyBl projects, while also working on RTE security analysis and voltage management projects.

Tuesday September 15, 2026 15:20 - 16:05 CEST
Elektro Stage

Modeling, Demo Sessions

15:55 CEST

Asset Thermal Models: Expanding the Family of Thermal Models To Cables and Switchgear - Anna Van Velsen & Jesse Tjebbes, Alliander

Tuesday September 15, 2026 15:55 - 16:25 CEST

Seebühne

We need the capability to thermally model all components in the chain of assets. The global energy transition is rapidly reshaping electricity systems, driven by decarbonization, electrification, and the integration of renewables. These developments introduce new operational challenges for grid operators, including increased congestion and the need to maximize existing grid capacity while ensuring reliability.

Building on our Transformer Thermal Model, we add two new members to the family of thermal models: Cable Thermal Model (CTM) and Switchgear Thermal Model (SGTM). These models estimate asset temperatures based on load, ambient conditions, and technical specifications. Together, they allow operators to identify bottlenecks, assess hidden capacity, and mitigate congestion risks. As this now enables operators to model most primary components in the grid, the applicability and value increase exponentially!

In this talk, we demonstrate how we apply these models in practice across multiple asset types, enabling higher asset utilization, optimal grid planning, improved monitoring, and more efficient system operation.

Speakers

Jesse Tjebbes

PO, Alliander

Jesse Tjebbes is a Product Owner for Asset & Product Management at Alliander. He drives several initiatives to leverage the Asset Thermal Models in business processes for maximum organizational impact.

Anna Van Velsen

Data Scientist, Alliander

Anna van Velsen is a data scientist at Alliander, a Dutch distribution system operator. She contributes to the development of our thermal models which help Alliander to fully utilize our critical assets under acceptable accelerated aging.

Tuesday September 15, 2026 15:55 - 16:25 CEST
Seebühne

Modeling, Session Presentation

16:30 CEST

Phlowers: An Ecosystem for Physical Simulations of Overhead Lines - Jérémy Wang & Adrien Goeller, RTE

Tuesday September 15, 2026 16:30 - 17:00 CEST

Seebühne

Understanding, simulating and predicting the behavior of overhead lines and their supporting structures (including electrical towers) is essential for securing grid maintenance and extending asset life. Phlowers provides tools to achieve this in a simple way, despite the complexity of the underlying algorithms.

Phlowers is an Open Source ecosystem that brings mechanical and thermal modeling of overhead lines to engineers, researchers and operators, including those working offline. In the future, it will integrate the modeling of supporting structures (pylons/towers) to simulate mechanical constraints and interactions within the grid.

The ecosystem currently includes Python libraries for simulations and an offline web application called Stellar. It enables users to customize models, integrate their own data and adapt tools to operational needs. It will also support large-scale batch computations to assess maintenance policies, simulate multiple scenarios and optimize long-term asset management strategies.

In this session, we will explore its architecture, use cases and contribution to innovation in grid asset management.

Speakers

Jérémy Wang

Software Engineer, RTE

Software engineer after graduating from CentraleSupélec (Paris-Saclay University) in 2024. Worked on the projects of Phlowers about mechanics: Mechaphlowers and Stellar.

Adrien Goeller

Tech Lead, RTE

At RTE, Adrien Goeller leads technical development in software for overhead power lines. He’s behind several Open Source projects in the Phlowers initiative. He worked before on DLR and thermic analysis subjects. He also supports R&D in AI and MLOps for automated grid inspection... Read More →

Tuesday September 15, 2026 16:30 - 17:00 CEST
Seebühne

Modeling, Session Presentation

10:30 CEST

Taming the Circus: The Future of Power System Planning Model Interoperability - Karin Wadsack, Global Power System Transformation Consortium; Bryan Palmintier, National Laboratory of the Rockies; Thomas van Dijk, TNO

Wednesday September 16, 2026 10:30 - 11:00 CEST

Crossover

Several related power system planning model interoperability initiatives will share their latest progress, challenges, and real-world applications, including consideration of the differing needs of different end users. Panelists will discuss the potential to align efforts and the challenges and opportunities in delivering both a more effective and more streamlined future modeling experience for end users, from grid operators to energy ministries to civil society. Presenters will cover where models overlap, where models diverge, and what the realistic boundaries are for interoperability, and will invite participants to consider which standards will likely align and which will remain distinct, both in the electricity/TSO/DSO domain and in the sector coupling/multi-commodity domain. Session panelists and participants will discuss the anticipated ways that system planning modeling will change in the next decade and how to future-proof interoperability.

Participants may include: NLR (Sienna/GDM), Princeton (GenX), VTT/Nodal Tools (CESM), TU Berlin (PyPSA), OET, Encoord, TZ, RTE, AFRY, Recognis, EPRI, Imperial College (OSeMOSYS), ENTSO-E, SOPTIM (CGMES), Sylvan

Speakers

Thomas van Dijk

Digital Energy Business Developer, TNO

Karin Wadsack

Executive Director, Global Power System Transformation Consortium

Karin Wadsack is Executive Director of the Global Power System Transformation Consortium. She supports the development and deployment of open-source tools for power system operation and planning. She is convinced that the open-source approach provides the greatest driver for the critical... Read More →

Bryan Palmintier

Group Manager and Principle Research Engineer, National Laboratory of the Rockies

Bryan leads the T&D interactions group in Grid Planning and Analysis at the National Lab of the Rockies (NLR, formerly NREL). He researches integrated grid planning across generation, transmission, distribution, and customers, including new multi-model tools to capture DERs, grid-adjacent... Read More →

Wednesday September 16, 2026 10:30 - 11:00 CEST
Crossover

Modeling, Panel Discussion

10:30 CEST

PowSyBl Open RAO, a Shared Roadmap - Mathieu Kretz, Artelys & Viktor Terrier, RTE - Réseau de Transport d'Electricité

Wednesday September 16, 2026 10:30 - 11:15 CEST

Sonnendeck

Remedial Action Optimisation (RAO) is becoming a key operational capability to manage interconnected power systems across Europe. As requirements evolve and implementations mature, there is a growing need for coordination between stakeholders contributing to and relying on shared solutions.
This Birds of a Feather session is an open, collaborative forum around PowSyBl OpenRAO, bringing together developers such as Artelys, TSOs such as RTE, and RCCs such as Coreso to exchange on experiences, ongoing work, and upcoming priorities.
RTE and Artelys will present developments carried out on OpenRAO over the past year and those planned for the next (algorithmic improvements, countertrading within the optimisation core, …), with a focus on alignment with requirements from ongoing projects, notably SWE ROSC for Coreso. The session will also explore connections with related initiatives, including ToOP.
Rather than a one-way presentation, we will focus on interaction: participants will be invited to share plans, challenges, and expectations regarding OpenRAO. The objective is to foster convergence, encourage contributions, and strengthen a shared vision for OpenRAO within the LFE community.

Speakers

Mathieu Kretz

Project Manager, Artelys

Mathieu Kretz is an ENSTA Paris engineering graduate specializing in Energy Production and Management, now a Project Manager at Artelys with extensive experience in energy systems and access projects across Africa, the Middle East, and Asia. At Sofreco, he led solar integration studies... Read More →

Viktor Terrier

Product owner, RTE - Réseau de Transport d'Electricité

Viktor Terrier graduated from Centrale-Supélec (France, 2016) and KTH (Sweden, 2017). At RTE, he worked on capacity calculation and remedial action optimisation between 2017 and 2020 as a software engineer, and since 2024 as the product owner of OpenRAO.

Wednesday September 16, 2026 10:30 - 11:15 CEST
Sonnendeck

Modeling, Birds of a Feather Sessions

11:05 CEST

From Code To Models-as-Data: GEMS, a High-Level Language for Energy System Modelling - Thomas Bittar, RTE

Wednesday September 16, 2026 11:05 - 11:35 CEST

Crossover

Energy systems are undergoing rapid transformation as sector coupling intensifies and variable renewable generation grows, creating a pressing need for flexible and transparent modeling tools. While many open-source frameworks offer rich features, extending them with new mathematical models typically requires writing custom software, a barrier for many analysts.

We present GEMS (Generic Energy Systems Modelling Schema), a high-level modelling language designed to make multi-energy system adequacy and planning studies both more expressive and more accessible. GEMS brings model definitions out of the codebase and into simple YAML configuration files, where users describe variables, parameters, and constraints using natural mathematical expressions. These expressions are parsed into abstract syntax trees and automatically expanded into a complete optimization problem. This model-agnostic architecture enables rapid experimentation, lowers development and maintenance costs, and promotes true reusability: adding a new model requires no code, only data. The language is already supported in Antares Simulator and in the Python package GemsPy.

Speakers

Thomas Bittar

R&D Researcher, RTE

Thomas Bittar is a research engineer at RTE, specializing in modeling and optimization of energy systems for long-term prospective studies. He holds a PhD in stochastic optimization from École des Ponts ParisTech. Since 2021, he contributes to the development of Antares Simulator... Read More →

Wednesday September 16, 2026 11:05 - 11:35 CEST
Crossover

Modeling, Session Presentation

11:25 CEST

TopRAO: Real-Time Combined Remedial Actions Optimization With ToOp and OpenRAO - Nico Westerbeck, 50Hertz Transmission GmbH & Peter Mitri, RTE (Réseau de Transport d'Electricité)

Wednesday September 16, 2026 11:25 - 12:10 CEST

Elektro Stage

Operating highly loaded grids in real time requires combining powerful topology optimisation with efficient handling of “linear” remedial actions. ToOp, developed by 50Hertz, is a state-of-the-art optimiser for topological measures, going beyond the topology optimisation currently available in OpenRAO.

In TopRAO, we couple ToOp with the Powsybl-based OpenRAO toolbox: OpenRAO optimises linear remedial actions (PST, redispatching, counter-trading, HVDC), while ToOp focuses on topological measures. Together, they form a real-time-capable RAO engine for security analysis at TSO and inter-TSO level.

This demo walks through an end-to-end workflow: importing network data, running joint optimization of topology and linear actions, and analysing resulting constraints, actions and costs using open, transparent components.

Speakers

Nico Westerbeck

Research Engineer / Software Architect, 50Hertz Transmission GmbH

Studied computer scientist with expertise in optimization, HPC, electrical engineering, etc

Peter Mitri

Software engineer, RTE (Réseau de Transport d'Electricité)

Software engineer with a 10+-year experience in optimization software.
Member of the PowSyBl developers community.

Wednesday September 16, 2026 11:25 - 12:10 CEST
Elektro Stage

Modeling, Demo Sessions

11:40 CEST

CIM/CGMES in Real-time Knowledge Graphs for Modern Grid Control Systems - Arne Bernhardt, SOPTIM AG

Wednesday September 16, 2026 11:40 - 12:10 CEST

Crossover

Modern grid control systems require interoperable, scalable, and vendor-neutral data infrastructures. While CIM/CGMES has become the standard exchange format for power system models, many implementations still treat it primarily as a file format instead of a semantic data platform.

This session presents practical experiences from building modern utility control system components using RDF, SHACL, SPARQL, Apache Jena, and open-source tooling. We will show how semantic technologies can evolve from offline model exchange into high-performance, real-time knowledge graph infrastructures for power systems.

Topics include high-performance in-memory RDF graph processing, SHACL validation for operational grid models, lessons learned from Apache Jena internals, and the development of open-source tooling such as RDFArchitect and OpenCGMES.

The session shares real-world insights from developing software for transmission system operators and discusses how open semantic infrastructures can support interoperable and future-proof digital energy systems.

Speakers

Arne Bernhardt

Division Manager for Grid Control Systems, SOPTIM AG

Arne Bernhardt is Division Manager for Grid Control Systems at SOPTIM AG, developing software for transmission system operators and digital energy infrastructures. His work focuses on CIM/CGMES, RDF, SHACL, SPARQL, semantic interoperability, and high-performance in-memory graph processing... Read More →

Wednesday September 16, 2026 11:40 - 12:10 CEST
Crossover

Modeling, Session Presentation

13:30 CEST

Bridging the Gap: Advancing PyPSA as an Industry-Grade Open Energy Planning Framework - Fabian Hofmann, Open Energy Transition

Wednesday September 16, 2026 13:30 - 13:40 CEST

Seebühne

Open-source energy models are becoming increasingly important for transparent and reproducible energy planning. At the same time, many institutions still rely on proprietary software for day-to-day planning and decision-making. Closing this gap requires more than open code. Open-source tools also need the functionality, reliability, and long-term support expected by industry users.

This session presents the PyPSA-Taskforce, a joint initiative by Technische Universität Berlin, Università di Pisa, and Open Energy Transition to strengthen PyPSA as a professional open-source tool for energy system planning. The Taskforce focuses on improving areas of PyPSA that are still missing or not yet mature enough for wider industry adoption.

The project focuses on developing and integrating capabilities needed for real-world planning applications while maintaining the transparency and flexibility that make open-source tools valuable. At the same time, it aims to move beyond the limitations of proprietary software by building a tool that can evolve openly with the needs of the energy transition.

Speakers

Fabian Hofmann

Senior Energy System Modeller, Open Energy Transition

Fabian is a Senior Energy System Modeller and core developer of the PyPSA ecosystem. He has developed PyPSA since 2016 and has played a significant role in shaping its trajectory, while creating complementary tools and mostly focusing on enhancing the user experience with PyPSA. Holding... Read More →

Wednesday September 16, 2026 13:30 - 13:40 CEST
Seebühne

Modeling, Lightning Talk

13:45 CEST

Dynaωo for Large-Scale Power System Event Analysis: The 2025 Iberian Blackout - Marco Chiaramello; Gilles Aouizerate, Joy El Feghali & Florentine Rosiere, RTE

Wednesday September 16, 2026 13:45 - 14:15 CEST

Waldbühne

On 28 April 2025, continental Spain and Portugal experienced a total blackout, while the rest of the European grid was largely unaffected. This most severe European blackout in over 20 years is analysed using a time-domain model of the Iberian system derived from an anonymised network snapshot. In its final report on the incident, ENTSO-E’s Expert Panel identifies LF Energy’s Dynaωo, an open-source, industrial-grade suite of simulation tools, as the basis for its independent voltage stability study. Simulations closely reproduce recorded measurements and clarify the roles of cross-border exchanges, TSO-DSO interactions, distributed renewable energy sources and limited reactive power margins in the voltage rise that triggered the cascade. The study highlights the value of relying on an open-source industrial tool and shows how Dynaωo has evolved into a robust, high-performance solution. The presentation will detail the modelling and simulation approach, key challenges, and the main insights gained on the 28 April 2025 events, demonstrating how Dynaωo delivers the level of transparency, reproducibility and scientific rigour now expected for the analysis of major power system events.

Speakers

Marco Chiaramello

Dr, R&D project manager, RTE, Réseau de Transport d’Électricité

Florentine Rosiere

R&D engineer, RTE

Gilles Aouizerate

R&D Engineer, RTE

Joy El Feghali

Research engineer in Power System modelling and simulation, RTE

Wednesday September 16, 2026 13:45 - 14:15 CEST
Waldbühne

Modeling, Panel Discussion

14:20 CEST

Presenting DyCoV - Streamlining Dynamic Model-validation and Performance Verification Using Dynawo - Jose Luis Marin, AIA

Wednesday September 16, 2026 14:20 - 14:50 CEST

Waldbühne

DyCoV (Dynamic Compliance Verification) is an Open-Source tool built by RTE for bringing transparency to the process of verifying grid-code compliance of the dynamic behavior of new generation facilities. It contemplates both *electric performance* (i.e., "does the behavior pass the requirements?") and *generic model validation* (i.e., "does the model match the actual behavior?").

The tool builds upon Dynawo, RTE's Open-Source dynamic simulator, which in turn uses Open Modelica for its RMS models, including WECC and IEC generic models. This provides a fully transparent process for all stakeholders, thus avoiding the pitfalls of proprietary models and black-box tools. In addition, DyCoV removes the drudgery of measuring, comparing, and extracting all required KPIs from curves: rise/settling times, FRT responses, point-wise diffs, etc.

The tool is built with Python and structured as a series of independent tests, each producing its own report in PDF. The current tests correspond to RTE's connection grid code (DTR document), but DyCoV design uses templating (Jinja) and configuration files to make it easily adaptable to other grid codes, avoiding code changes as much as possible.

Speakers

Jose Luis Marin

Director, Enery Unit, AIA

PhD in Physics and EU Marie Curie fellow. Joined AIA and its US subsidiaries in 2005 to lead consulting projects in Power Systems, including R&D projects for NASA. He has contributed to algorithms, numerical computation, deployments at control centers, training, product documentation... Read More →

Wednesday September 16, 2026 14:20 - 14:50 CEST
Waldbühne

Modeling, Session Presentation

15:20 CEST

Batch N‑1 Power Flow Via Perturbation Methods - Georg Mensah, 50 Hertz/ Elia Group

Wednesday September 16, 2026 15:20 - 15:50 CEST

Waldbühne

Modern AI for power flow and OPF is on the rise, but it will still require large amounts of trustworthy training data and strong conventional solvers for validation (“solver‑certified AI”). An important application are adjacent‑state studies needed for N‑1 screening and decision planning. This session argues that classic algorithms will not vanish, but must be redesigned for batch computation: solving many related grid states faster than repeated Newton-style runs. We reshape ideas from perturbation theory into a load-flow solver pattern that reuses structure across scenarios and maps well to parallelizable hardware. We introduce the key mathematics behind the approaches including the holomorphic embedding load flow method (HELM) and related methods. We then show how to turn them into an engineering workflow that can outperform repeated Newton-Raphson solves in high-throughput studies. We close with an open roadmap: an industrial‑grade implementation under development at 50Hertz/Elia Group and a clear invitation to collaborate on open interfaces, benchmarks, and integration with LF Energy tooling.

Speakers

Georg Mensah

Product Owner, 50 Hertz/ Elia Group

Georg Mensah specialized in efficient numerical algorithms. He graduated in 2018 with a Ph.D. in Engineering Science from TU Berlin. After a postdoc position at ETH Zürich, he worked for several years in the cloud‑based industrial simulation industry. Coming from gas turbine engineering... Read More →

Wednesday September 16, 2026 15:20 - 15:50 CEST
Waldbühne

Modeling, Session Presentation

15:55 CEST

Bringing the Industry Together Through LF Energy - A Power Grid Model Story - Peter Salemink, Alliander & Udo Schmitz, SOPTIM AG

Wednesday September 16, 2026 15:55 - 16:25 CEST

Waldbühne

Power Grid Model is a high-performance, open-source calculation library built for advanced distribution system analysis.

This joint presentation by Alliander and SOPTIM tells a story of open source collaboration and innovation between a Grid Operator and Vendor within the LF Energy Power Grid Model (PGM) project.

Alliander—maintainer of the Power Grid Model project—and SOPTIM—a key contributor—have met each other at a LF Energy summit, which has led to a productive partnership, including shared development efforts, knowledge exchange, and the introduction of new features that enhance the capabilities of the model.

Overall, the presentation provides a tangible example of how open collaboration within LF Energy can drive innovation, strengthen ecosystems, and accelerate the development of open-source solutions for the energy sector, while also diving into the technical part of new features that support the various use cases at Alliander and SOPTIM.

Speakers

Peter Salemink

Product Owner, Alliander

Peter Salemink is a Senior Scientific Software Engineer at Alliander, a Dutch Distribution System Operator (DSO). As Product Owner and chair of the technical steering committee he is responsible for the daily development of Power Grid Model. He is also teaching at the Eindhoven University... Read More →

Udo Schmitz

Chief Engineer Grid Analysis, SOPTIM AG

Specializes in developing open‑source and custom solutions for grid modeling and analysis. Contributor to Power Grid Model (PGM), co‑developer of the CGMES2PGM Converter, and maintainer of the Julia‑based power‑flow framework SPARLECTRA.jl. Experienced in Online State Estimation... Read More →

Wednesday September 16, 2026 15:55 - 16:25 CEST
Waldbühne

Modeling, Session Presentation

16:30 CEST

DC+: A Fast, Voltage-Aware Alternative To DC Load Flow - Benjamin Petrick, NEZK

Wednesday September 16, 2026 16:30 - 17:00 CEST

Waldbühne

Grid operations are becoming fundamentally more complex. The classical DC load-flow worked well in the past, but its simplifying assumptions are increasingly violated in modern grids with high renewables, reactive power flows, and tighter operational margins.

DC+ is a voltage-sensitive linearization of the AC load flow that retains voltage magnitude, angles, and reactive power while remaining orders of magnitude faster than full AC solvers.
Conceptually, it corresponds to a single Newton step around the AC base case, capturing the direction and severity of violations far more accurately than classical DC, while scaling to millions of N‑1 evaluations per second on GPUs.

DC+ enables a new class of scalable, open optimization workflows:
Potential use cases of DC+ are:
- Fast contingency screening and ranking?
- Topology optimization with voltage awareness?
- Security constrained voltage Optimization?

Speakers

Benjamin Petrick

Electrical Engineer, NEZK

Background in electrical engineering and software engineering.

Wednesday September 16, 2026 16:30 - 17:00 CEST
Waldbühne

Modeling, Session Presentation

10:30 CEST

10:30 CEST

11:05 CEST

11:15 CEST

11:25 CEST

11:40 CEST

13:10 CEST

14:05 CEST

15:20 CEST

15:20 CEST

15:55 CEST

16:30 CEST

10:30 CEST

10:30 CEST

11:05 CEST

11:25 CEST

11:40 CEST

13:30 CEST

13:45 CEST

14:20 CEST

15:20 CEST

15:55 CEST

16:30 CEST

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