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Estonia mFRR clearing prices

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.

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Endpoints

Row schema

ColumnTypeUnitNullableDescription
mtu_start string (date-time) — no Market Time Unit start (ISO 8601 UTC). Each MTU is a 15-minute settlement interval.
direction string enum: up | down — no Activation direction: up = TSO buys energy from BSP, down = TSO sells back.
price_eur_mwh number EUR/MWh yes Marginal clearing price for activated balancing energy in this direction. Null when no activation cleared in this MTU.

Top-level response: { schema_version, generated_at, meta, rows: [...] }

Code samples

curl 
curl https://public-data.volton.energy/v1/mfrr-clearing-price/latest.json
DuckDB 
SELECT * FROM read_json_auto(
  'https://public-data.volton.energy/v1/mfrr-clearing-price/latest.json',
  records = false
);
Python (pandas) 
import pandas as pd

resp = pd.read_json('https://public-data.volton.energy/v1/mfrr-clearing-price/latest.json')
df = pd.DataFrame(resp['rows'])
R (jsonlite) 
library(jsonlite)
data <- fromJSON('https://public-data.volton.energy/v1/mfrr-clearing-price/latest.json')
df <- data$rows
JavaScript (fetch) 
const r = await fetch('https://public-data.volton.energy/v1/mfrr-clearing-price/latest.json');
const { rows, meta } = await r.json();
Excel Power Query (M) 
let
    Source = Json.Document(Web.Contents("https://public-data.volton.energy/v1/mfrr-clearing-price/latest.json")),
    Rows = Source[rows],
    AsTable = Table.FromRecords(Rows)
in
    AsTable

Methodology

Each row represents the marginal clearing price set by the Common Merit Order List that mFRR activations cleared at, for a single 15-minute MTU and a single direction. Up = system was short of energy and mFRR ramped generation up; down = system was long and mFRR ramped generation down.

Estonia joined the EU MARI platform on 9 October 2024. Since then, Baltic mFRR clearing prices are derived from the cross-border MARI auction rather than the legacy Baltic-only auction. Prices are capped at ±10 000 EUR/MWh by MARI and have hit the cap multiple times during scarcity events.

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

FAQ

Why are some prices very high or very low?
During system scarcity (low wind, large generator outage, interconnector trip) the marginal mFRR bid that clears can be expensive — bids near the platform cap of 10 000 EUR/MWh have settled on multiple occasions in 2025–2026. Negative prices occur when the system is oversupplied and downward mFRR is cheap to procure.
How does this compare to the day-ahead spot price?
Day-ahead is forecast-based and clears once at noon for every hour of the next day. mFRR is real-time activation: it covers the gap between the day-ahead forecast and what actually happened, so it usually moves more than spot during balancing events.
Can I download the underlying data?
Yes — see the developer API page for stable JSON URLs. Data is published under CC-BY-4.0; please cite Volton and the upstream source (Elering / Baltic Transparency Dashboard).

License + citation

Source: Elering / Baltic Transparency Dashboard via Volton, CC-BY-4.0. CC-BY-4.0.

Volton Technology OÜ (2026). Estonia mFRR clearing prices.
CC-BY-4.0. https://public-data.volton.energy/mfrr-clearing-price/

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