elmix: a Swedish electricity-market dashboard built with Scala.js + Laminar

[oluies]

Hi all 👋

Sharing a small project where Laminar drives the UI: elmix — a dashboard for the Swedish day-ahead electricity market (bidding zones SE1–SE4).

• Data: fetches ENTSO-E (generation, day-ahead prices, cross-border flows, imbalance) and builds Parquet "marts" with DuckDB.
• UI (Laminar + Scala.js): reactive zone pickers (Var/Signal), small-multiples grids, a dual-axis price-vs-wind chart with zoom, and a PCA view. Charts render with Apache ECharts through a tiny hand-written facade — Laminar owns the reactive shell and re-renders chart options on signal changes.
• Fun bit: the PCA of the generation mix is plain functional Scala (Jacobi eigendecomposition, no deps), so it compiles to Scala.js — I'm moving it client-side so you'll be able to pick a time window and recompute the PCA live in the browser.
• There's also a prerendered, zero-JS SVG variant of the same charts via ECharts' Node SSR.

Live (GitHub Pages):

• Interactive: https://oluies.github.io/elmix/
• Prerendered SVG: https://oluies.github.io/elmix/prerendered.html

Source: https://github.com/oluies/elmix

Thanks for Laminar — the Var/Signal model made wiring the pickers to ECharts delightfully simple. Feedback welcome!