We’re generating more and more energy with renewables, which is great... but where does the energy go from there? One answer is "build lots of batteries," but that’s only part of the story. Smart energy storage means predicting consumption patterns, optimising when batteries charge and discharge, and balancing cost with reliability.

Join us on Tuesday, 11 November 2025, for an evening hosted and sponsored by Cactos, a company turning battery energy storage into a smart, data-driven system. We'll meet at Sofia Helsinki for technical talks by Cactos and others, plus snacks, drinks, and good company. Attendance is free but seats are limited: register soon!

We're planning to stream the talks on Twitch. We're still newbies at streaming but please send feedback on Discord, channel #pydata-helsinki.

Confirmed talks

Olli Ruokojoki: Data-Driven Batteries: Modeling State of Charge and Health from Operational Data

Tuomas Sivula: Stochastic Models in Energy Storage Operating Environments

Quentin Salomé: ⚡️ Estimating the surface area of lakes using satellite images

Osvaldo Martin: ⚡️ ArviZ 1.0: Refactoring for flexibility, extensibility, and power

Jouni Seppänen: Python Visualisation Tools

Schedule

17:30 doors open 18:00 PyData Helsinki intro 18:05 Cactos intro 18:15 Olli Ruokojoki: Data-Driven Batteries: Modeling State of Charge and Health from Operational Data 18:35 Tuomas Sivula: Stochastic Models in Energy Storage Operating Environments 19:00 Food and mingling 19:45 🔮 PyData Helsinki Quiz 19:55 Quentin Salomé: ⚡️ Estimating the surface area of lakes using satellite images 20:05 Osvaldo Martin: ⚡️ ArviZ 1.0: Refactoring for flexibility, extensibility, and power 20:15 Jouni Seppänen: Python Visualisation Tools 20:30 End of event, continue at a pub 🍻