Why is the value sometimes a few mHz off 50?

Even small imbalances move frequency. FCR and aFRR continuously correct it, so under normal conditions it stays in a tight band around 50 Hz across the Nordic synchronous area.

Is this the same as the Estonian / Baltic frequency?

No. Finland is in the Nordic synchronous area; the Baltic states joined the Continental European area in February 2025. The two areas hold independent frequencies, so the Finnish value differs from the Baltic one.

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Finland grid frequency

Name: Finland grid frequency
Creator: Volton
License: https://creativecommons.org/licenses/by/4.0/

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.

Methodology

AC frequency is the heartbeat of the grid: nominal 50 Hz means generation exactly matches consumption. When generation exceeds consumption, frequency rises; shortage pushes it down. FCR responds within 30 s to keep the system inside ±200 mHz; aFRR brings it back to 50.000.

Sample rate here is downsampled to 5-min averages so the page is light to load. Volton samples at higher resolution internally for trading; the public feed is the 5-min mean.

FAQ

Why is the value sometimes a few mHz off 50?: Even small imbalances move frequency. FCR and aFRR continuously correct it, so under normal conditions it stays in a tight band around 50 Hz across the Nordic synchronous area.
Is this the same as the Estonian / Baltic frequency?: No. Finland is in the Nordic synchronous area; the Baltic states joined the Continental European area in February 2025. The two areas hold independent frequencies, so the Finnish value differs from the Baltic one.

Get this data

JSON download and stable URL pattern available on the developer API page.

↓ JSON API docs →https://public-data.volton.energy/v1/grid-frequency-fi/latest.json

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