# Volton Public Data API > Free, CC-BY-4.0 Baltic and Finnish electricity-market data — JSON over HTTPS, hourly refresh. > Sourced from Elering, Nord Pool, ENTSO-E via the Volton Liisa pipeline. Site: https://public-data.volton.energy OpenAPI 3.1 spec: https://public-data.volton.energy/openapi.yaml Status: https://public-data.volton.energy/v1/_status.json ## URL pattern - https://public-data.volton.energy/v1/{slug}/latest.json — rolling 7-day window, cached 60s. Includes today's partial data; this is the URL to use for "today". - https://public-data.volton.energy/v1/{slug}/{YYYY-MM-DD}.json — sealed immutable per-day archive (Europe/Tallinn local). Published only after the settlement delay and cadence-completeness checks. Missing dates return 404. Read /v1/_status.json's latest_archive_date to find the most recent fully-archived day. - https://public-data.volton.energy/v1/_status.json — per-dataset last_refresh + health. Fetch this first to discover what's actually available. ## Datasets - [Estonia mFRR clearing prices](https://public-data.volton.energy/mfrr-clearing-price/) — Manually-activated Frequency Restoration Reserve (mFRR) energy clearing prices for the Estonian bidding zone. One value per 15-minute Market Time Unit, per direction (up or down). Sourced from Elering and the Baltic Transparency Dashboard, refreshed hourly. - JSON: https://public-data.volton.energy/v1/mfrr-clearing-price/latest.json - Unit: EUR/MWh · Coverage: Estonia (EE bidding zone), from 2024-10-09 - [Latvia mFRR clearing prices](https://public-data.volton.energy/mfrr-clearing-price-lv/) — Manually-activated Frequency Restoration Reserve (mFRR) energy clearing prices for the Latvian bidding zone. One value per 15-minute Market Time Unit, per direction (up or down). Sourced from Elering and the Baltic Transparency Dashboard, refreshed hourly. - JSON: https://public-data.volton.energy/v1/mfrr-clearing-price-lv/latest.json - Unit: EUR/MWh · Coverage: Latvia (LV bidding zone), from 2024-10-09 - [Lithuania mFRR clearing prices](https://public-data.volton.energy/mfrr-clearing-price-lt/) — Manually-activated Frequency Restoration Reserve (mFRR) energy clearing prices for the Lithuanian bidding zone. One value per 15-minute Market Time Unit, per direction (up or down). Sourced from Elering and the Baltic Transparency Dashboard, refreshed hourly. - JSON: https://public-data.volton.energy/v1/mfrr-clearing-price-lt/latest.json - Unit: EUR/MWh · Coverage: Lithuania (LT bidding zone), from 2024-10-09 - [Finland mFRR clearing prices](https://public-data.volton.energy/mfrr-clearing-price-fi/) — Finland's mFRR balancing-energy market price, the marginal price of manually-activated balancing energy, up and down, published by Fingrid every 15 minutes. Finland is in the Nordic balancing market and participates in the EU MARI platform. Refreshed hourly. - JSON: https://public-data.volton.energy/v1/mfrr-clearing-price-fi/latest.json - Unit: EUR/MWh · Coverage: Finland (FI bidding zone), from 2024-10-09 - [Estonia aFRR clearing prices](https://public-data.volton.energy/afrr-clearing-price/) — Automatically-activated Frequency Restoration Reserve (aFRR) energy clearing prices for the Estonian bidding zone. One value per 15-minute Market Time Unit, per direction (up or down). Sourced from Elering, refreshed hourly. - JSON: https://public-data.volton.energy/v1/afrr-clearing-price/latest.json - Unit: EUR/MWh · Coverage: Estonia (EE bidding zone), from 2025-04-15 - [Latvia aFRR clearing prices](https://public-data.volton.energy/afrr-clearing-price-lv/) — Automatically-activated Frequency Restoration Reserve (aFRR) energy clearing prices for the Latvian bidding zone. One value per 15-minute Market Time Unit, per direction (up or down). Sourced from Elering, refreshed hourly. - JSON: https://public-data.volton.energy/v1/afrr-clearing-price-lv/latest.json - Unit: EUR/MWh · Coverage: Latvia (LV bidding zone), from 2025-04-15 - [Lithuania aFRR clearing prices](https://public-data.volton.energy/afrr-clearing-price-lt/) — Automatically-activated Frequency Restoration Reserve (aFRR) energy clearing prices for the Lithuanian bidding zone. One value per 15-minute Market Time Unit, per direction (up or down). Sourced from Elering, refreshed hourly. - JSON: https://public-data.volton.energy/v1/afrr-clearing-price-lt/latest.json - Unit: EUR/MWh · Coverage: Lithuania (LT bidding zone), from 2025-04-15 - [Estonia mFRR capacity prices](https://public-data.volton.energy/mfrr-capacity-price/) — BBCM-cleared mFRR capacity availability prices for the Estonian bidding zone, what BSPs are paid for *being available*, separate from energy activation prices. One value per 15-minute MTU, per direction. Sourced from the Baltic Transparency Dashboard, refreshed hourly. - JSON: https://public-data.volton.energy/v1/mfrr-capacity-price/latest.json - Unit: EUR/MW/h · Coverage: Estonia (EE bidding zone), from 2025-02-04 - [Latvia mFRR capacity prices](https://public-data.volton.energy/mfrr-capacity-price-lv/) — BBCM-cleared mFRR capacity availability prices for the Latvian bidding zone, what BSPs are paid for *being available*, separate from energy activation prices. One value per 15-minute MTU, per direction. Sourced from the Baltic Transparency Dashboard, refreshed hourly. - JSON: https://public-data.volton.energy/v1/mfrr-capacity-price-lv/latest.json - Unit: EUR/MW/h · Coverage: Latvia (LV bidding zone), from 2025-02-04 - [Lithuania mFRR capacity prices](https://public-data.volton.energy/mfrr-capacity-price-lt/) — BBCM-cleared mFRR capacity availability prices for the Lithuanian bidding zone, what BSPs are paid for *being available*, separate from energy activation prices. One value per 15-minute MTU, per direction. Sourced from the Baltic Transparency Dashboard, refreshed hourly. - JSON: https://public-data.volton.energy/v1/mfrr-capacity-price-lt/latest.json - Unit: EUR/MW/h · Coverage: Lithuania (LT bidding zone), from 2025-02-04 - [Finland mFRR capacity prices](https://public-data.volton.energy/mfrr-capacity-price-fi/) — Finland's mFRR capacity (procurement) price, what the TSO pays per MW per hour for reserved mFRR capacity, published hourly by Fingrid. Separate from the energy price paid on activation. - JSON: https://public-data.volton.energy/v1/mfrr-capacity-price-fi/latest.json - Unit: EUR/MW/h · Coverage: Finland (FI bidding zone), from 2025-02-04 - [Estonia aFRR capacity prices](https://public-data.volton.energy/afrr-capacity-price/) — BBCM-cleared aFRR capacity availability prices for the Estonian bidding zone, what BSPs are paid for *being available*, separate from energy activation prices. One value per 15-minute MTU, per direction. Sourced from the Baltic Transparency Dashboard; aFRR capacity procurement on BBCM started 15 April 2025. - JSON: https://public-data.volton.energy/v1/afrr-capacity-price/latest.json - Unit: EUR/MW/h · Coverage: Estonia (EE bidding zone), from 2025-04-15 - [Latvia aFRR capacity prices](https://public-data.volton.energy/afrr-capacity-price-lv/) — BBCM-cleared aFRR capacity availability prices for the Latvian bidding zone, what BSPs are paid for *being available*, separate from energy activation prices. One value per 15-minute MTU, per direction. Sourced from the Baltic Transparency Dashboard; aFRR capacity procurement on BBCM started 15 April 2025. - JSON: https://public-data.volton.energy/v1/afrr-capacity-price-lv/latest.json - Unit: EUR/MW/h · Coverage: Latvia (LV bidding zone), from 2025-04-15 - [Lithuania aFRR capacity prices](https://public-data.volton.energy/afrr-capacity-price-lt/) — BBCM-cleared aFRR capacity availability prices for the Lithuanian bidding zone, what BSPs are paid for *being available*, separate from energy activation prices. One value per 15-minute MTU, per direction. Sourced from the Baltic Transparency Dashboard; aFRR capacity procurement on BBCM started 15 April 2025. - JSON: https://public-data.volton.energy/v1/afrr-capacity-price-lt/latest.json - Unit: EUR/MW/h · Coverage: Lithuania (LT bidding zone), from 2025-04-15 - [Estonia imbalance price](https://public-data.volton.energy/imbalance-price/) — The single imbalance price settled with every Estonian Balance Responsible Party each 15-minute MTU. Derived from the marginal balancing-energy bids activated through MARI / PICASSO. Sourced from Elering, refreshed hourly. - JSON: https://public-data.volton.energy/v1/imbalance-price/latest.json - Unit: EUR/MWh · Coverage: Estonia (EE bidding zone), from 2024-10-09 - [Latvia imbalance price](https://public-data.volton.energy/imbalance-price-lv/) — The single imbalance price settled with every Latvian Balance Responsible Party each 15-minute MTU. Derived from the marginal balancing-energy bids activated through MARI / PICASSO. Sourced from Elering, refreshed hourly. - JSON: https://public-data.volton.energy/v1/imbalance-price-lv/latest.json - Unit: EUR/MWh · Coverage: Latvia (LV bidding zone), from 2024-10-09 - [Lithuania imbalance price](https://public-data.volton.energy/imbalance-price-lt/) — The single imbalance price settled with every Lithuanian Balance Responsible Party each 15-minute MTU. Derived from the marginal balancing-energy bids activated through MARI / PICASSO. Sourced from Elering, refreshed hourly. - JSON: https://public-data.volton.energy/v1/imbalance-price-lt/latest.json - Unit: EUR/MWh · Coverage: Lithuania (LT bidding zone), from 2024-10-09 - [Finland imbalance price](https://public-data.volton.energy/imbalance-price-fi/) — Finland's single imbalance price per 15-minute settlement period, published by Fingrid, the price every Finnish balance-responsible party settles imbalances at. - JSON: https://public-data.volton.energy/v1/imbalance-price-fi/latest.json - Unit: EUR/MWh · Coverage: Finland (FI bidding zone), from 2024-10-09 - [Estonia day-ahead spot price](https://public-data.volton.energy/day-ahead-spot/) — The 15-minute day-ahead clearing price for the EE bidding zone, set by the SDAC pan-European auction each day. The reference price for nearly every Estonian electricity contract. Sourced from Nord Pool / ENTSO-E, refreshed hourly. - JSON: https://public-data.volton.energy/v1/day-ahead-spot/latest.json - Unit: EUR/MWh · Coverage: Estonia (EE bidding zone), from 2010-01-01 - [Latvia day-ahead spot price](https://public-data.volton.energy/day-ahead-spot-lv/) — The 15-minute day-ahead clearing price for the LV bidding zone, set by the SDAC pan-European auction each day. The reference price for nearly every Latvian electricity contract. Sourced from Nord Pool / ENTSO-E, refreshed hourly. - JSON: https://public-data.volton.energy/v1/day-ahead-spot-lv/latest.json - Unit: EUR/MWh · Coverage: Latvia (LV bidding zone), from 2010-01-01 - [Lithuania day-ahead spot price](https://public-data.volton.energy/day-ahead-spot-lt/) — The 15-minute day-ahead clearing price for the LT bidding zone, set by the SDAC pan-European auction each day. The reference price for nearly every Lithuanian electricity contract. Sourced from Nord Pool / ENTSO-E, refreshed hourly. - JSON: https://public-data.volton.energy/v1/day-ahead-spot-lt/latest.json - Unit: EUR/MWh · Coverage: Lithuania (LT bidding zone), from 2010-01-01 - [Finland day-ahead spot price](https://public-data.volton.energy/day-ahead-spot-fi/) — The 15-minute day-ahead clearing price for the FI bidding zone, set by the SDAC pan-European auction each day. The reference price for nearly every Finnish electricity contract. Sourced from Nord Pool / ENTSO-E, refreshed hourly. - JSON: https://public-data.volton.energy/v1/day-ahead-spot-fi/latest.json - Unit: EUR/MWh · Coverage: Finland (FI bidding zone), from 2010-01-01 - [Estonia grid frequency](https://public-data.volton.energy/grid-frequency/) — Real-time AC frequency on the Estonian grid, which has been part of the Continental European Synchronous Area since 9 February 2025. The whole CESA shares one frequency in real time, Estonia and Portugal see the same number. Sourced from Elering, downsampled to 5-min mean and refreshed hourly. - JSON: https://public-data.volton.energy/v1/grid-frequency/latest.json - Unit: Hz · Coverage: Continental European Synchronous Area (Baltic LFC block), from 2025-02-09 - [Latvia grid frequency](https://public-data.volton.energy/grid-frequency-lv/) — Real-time AC frequency on the Latvian grid, which has been part of the Continental European Synchronous Area since 9 February 2025. The whole CESA shares one frequency in real time, Latvia and Portugal see the same number. Sourced from Elering, downsampled to 5-min mean and refreshed hourly. - JSON: https://public-data.volton.energy/v1/grid-frequency-lv/latest.json - Unit: Hz · Coverage: Continental European Synchronous Area (Baltic LFC block), from 2025-02-09 - [Lithuania grid frequency](https://public-data.volton.energy/grid-frequency-lt/) — Real-time AC frequency on the Lithuanian grid, which has been part of the Continental European Synchronous Area since 9 February 2025. The whole CESA shares one frequency in real time, Lithuania and Portugal see the same number. Sourced from Elering, downsampled to 5-min mean and refreshed hourly. - JSON: https://public-data.volton.energy/v1/grid-frequency-lt/latest.json - Unit: Hz · Coverage: Continental European Synchronous Area (Baltic LFC block), from 2025-02-09 - [Finland grid frequency](https://public-data.volton.energy/grid-frequency-fi/) — Real-time AC frequency on the Finnish grid, part of the Nordic synchronous area (Finland, Sweden, Norway and eastern Denmark), a different synchronous area from the Baltics, which joined Continental Europe in February 2025. Sourced from Fingrid, downsampled to 5-min mean and refreshed hourly. - JSON: https://public-data.volton.energy/v1/grid-frequency-fi/latest.json - Unit: Hz · Coverage: Nordic synchronous area (Finland), from 2025-02-09 ## Citation Volton Technology OÜ (2026). Volton Public Data API. CC-BY-4.0. https://public-data.volton.energy