Stromfinder – interactive map of German charging stations

Just published Stromfinder – an interactive map showing all registered charging stations in Germany.

The data comes from my Ladesäulenregister project, which converts the official CSV from the Bundesnetzagentur into a gzip-compressed JSON file. Stromfinder loads this ~80 MB dataset in the browser using pako for decompression and renders ~70,000 stations on an OpenStreetMap map with marker clustering.

Fast chargers and normal chargers are color-coded (orange vs. green). Clicking a marker shows details like address, plug types, power ratings, and opening hours.

The UI is written in Elm with map integration via Leaflet Ports. It works as a Progressive Web App – installable and offline-capable after first load.

Try it out: ratopi.github.io/stromfinder

Source code on GitHub.