Volton Public Data

Free · CC-BY-4.0 · No authentication

Estonian electricity-market data, in JSON.

Hourly snapshots of day-ahead spot, mFRR + aFRR balancing energy and capacity prices, imbalance settlement, and grid frequency. Sourced from Elering, Nord Pool, and ENTSO-E via the Volton Liisa pipeline. Refreshed every hour. Per-day archives back to each dataset's start of coverage. 

curl https://public-data.volton.energy/v1/day-ahead-spot/latest.json
SELECT * FROM read_json_auto(
  'https://public-data.volton.energy/v1/day-ahead-spot/latest.json',
  records = false
);
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Datasets

Balancing energy

Reserve capacity

Imbalance

Spot prices

System state

Pattern

Versioning

The /v1/ prefix is a stable contract. Additive changes (new fields, new datasets) ship without notice; removals or schema narrowings publish under /v2/ with at least 12 months' overlap. Every JSON file embeds its schema_version for downstream branch logic.

Citation

Volton Technology OÜ (2026). Volton Public Data API.
CC-BY-4.0. https://public-data.volton.energy