How does aFRR differ from mFRR?

aFRR activates automatically within minutes via a continuous control signal (PICASSO). mFRR is manually-activated and slower — used to free up aFRR after a longer system imbalance. Both clear at 15-min MTU. aFRR typically settles in narrower price ranges than mFRR because activations are more frequent and smaller.

Why might values be missing?

Lithuania joined PICASSO in March 2025; gaps before that mean the Baltic-only legacy market was active and the cross-border data is not in the same series. Within the live PICASSO era, missing MTUs reflect periods with no activation in that direction.

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Lithuania aFRR clearing prices

Name: Lithuania aFRR clearing prices
Creator: Volton
License: https://creativecommons.org/licenses/by/4.0/

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.

Methodology

aFRR responds automatically to system frequency deviations within ~5 minutes — the middle reserve product between fast FCR (seconds) and slow mFRR (15 min). Activations clear at the marginal aFRR bid in the merit order, per 15-minute MTU and per direction.

Lithuania joined the EU PICASSO platform on 5 March 2025 — the first of the three Baltic states, over a month ahead of Estonia and Latvia. Baltic aFRR clearing prices come from the cross-border PICASSO auction; aFRR capacity is procured jointly on the BBCM, live since 15 April 2025.

Prices may be null for an MTU when no activation occurred in that direction.

FAQ

How does aFRR differ from mFRR?: aFRR activates automatically within minutes via a continuous control signal (PICASSO). mFRR is manually-activated and slower — used to free up aFRR after a longer system imbalance. Both clear at 15-min MTU. aFRR typically settles in narrower price ranges than mFRR because activations are more frequent and smaller.
Why might values be missing?: Lithuania joined PICASSO in March 2025; gaps before that mean the Baltic-only legacy market was active and the cross-border data is not in the same series. Within the live PICASSO era, missing MTUs reflect periods with no activation in that direction.

Get this data

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

↓ JSON API docs →https://public-data.volton.energy/v1/afrr-clearing-price-lt/latest.json

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