Why is the value sometimes a few mHz off 50?

Even tiny imbalances move frequency: a 100 MW shortage in CESA shifts it about 5 mHz. FCR / aFRR continuously correct, so the value stays in a tight band around 50 Hz under normal conditions.

Where does this Latvian frequency reading come from?

Frequency is a property of the whole synchronous area, not one bidding zone — every node in CESA shares the same value at any instant. Since the Baltic states synchronised with CESA on 9 February 2025, Latvia runs on this single Continental European frequency. We publish the Estonian PMU value (sourced from Elering); a Latvian meter would show a virtually identical curve.

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Latvia grid frequency

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

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.

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 tiny imbalances move frequency: a 100 MW shortage in CESA shifts it about 5 mHz. FCR / aFRR continuously correct, so the value stays in a tight band around 50 Hz under normal conditions.
Where does this Latvian frequency reading come from?: Frequency is a property of the whole synchronous area, not one bidding zone — every node in CESA shares the same value at any instant. Since the Baltic states synchronised with CESA on 9 February 2025, Latvia runs on this single Continental European frequency. We publish the Estonian PMU value (sourced from Elering); a Latvian meter would show a virtually identical curve.

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-lv/latest.json

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