Belgium’s grid operator names every battery it schedules: 14 of them, 828 MW. Another 1,720 MW is being built, about twice what Elia schedules today.

Elia’s list rose from 75 MW to 828 MW in 29 months, and every step in it has a name

Each step in this line is a battery Elia started scheduling, named by its operator in Elia’s own file. Elia usually starts scheduling a battery when it begins testing, months before its owner says it is in commercial operation: Vilvoorde entered the list at the start of May 2025 and ENGIE declared it fully in service on 14 November 2025. So a step is the day a battery reached the grid, not the day it started earning.

Elia Transmission Belgium, open data dataset ods179, “Individual data of contracted technical units”, the storage units, every day from 22 May 2024 to 20 October 2026, read 20 October 2026, Elia Open Data Licence. Steps of 45 MW or more are named, 100 MW or more on a phone; every step is in the table below. One capacitor bank Elia files as storage at 0 MW is left out. The dated steps are on the change ledger.

ENGIE Vilvoorde made 1.3 full discharges a day over the last 30 days of ENTSO-E’s meter, the most of the three metered batteries

ENTSO-E, the European grid operators’ platform, publishes the metered output of every Belgian generating unit of 100 MW and more, hour by hour, and Belgium files its largest batteries there. Dividing the energy a battery put out by the energy it can hold gives the number of times it emptied itself, which is the plainest measure of how hard it is worked. The meter counts output only; ENTSO-E publishes no charging for a unit, so what each battery drew is not here.

Full discharges each month, one chart per battery, on one scale.

Full discharges each month: the battery’s metered output that month divided by the capacity its owner states. A grey bar is a month the meter covers only in part, the battery’s first month or this one. ENTSO-E Transparency Platform, actual generation per generation unit (16.1.A), read 20 October 2026, to 16 October 2026; ENTSO-E publishes Belgian unit data a few days late. Every metered battery, month by month, with the table.

Navagne (Luminus Storage Visé) put out power on 7 of the last 30 days of the meter, and never more than 100 MW of its 150 MW, so its low figure is days without output, not light work on the days it ran; nothing published says why.

The metered batteries put out most at 20:00 and least at 03:00, Brussels time

The average output of the metered batteries together, hour by hour of the Brussels day, across every day ENTSO-E has published for each. A battery is paid for moving energy from the cheap hours to the dear ones, and for standing ready for Elia’s reserves, and this shape is what that looks like from the meter.

Average of every hour ENTSO-E published for 3 batteries, by hour of the Brussels day, in MW. Output only.

Belgium’s batteries put out 97 GWh in September 2026, from 13.4 GWh in January 2025

ENTSO-E also publishes the output of all Belgian storage together, hourly. Elia files it under energy storage, and the figure takes in every battery Elia meters, not only the three large ones. Pumped hydro at Coo and Plate-Taille is filed separately and is not in it.

ENTSO-E Transparency Platform, aggregated generation per type (16.1.B&C), Belgium, energy storage (B25), read 20 October 2026. The grey bar is this month so far. Output only.

Where the batteries are

One circle per named battery, sized by power. Yellow is scheduled by Elia or running; blue is being built; pale blue is announced; grey has no confirmed start.

35 of 35 batteries placed: 13 at the site itself, where OpenStreetMap has the battery mapped, the rest at the place their source names or the centre of their municipality, from GeoNames. By their owners’ figures, 830 MW scheduled or running, 1,720 MW being built, 649 MW announced or unconfirmed.

Every battery Elia schedules, and the ones running beside it

As the owner, developer or builder states it; the date is the owner’s stated start. 5 of these are in Elia’s schedule with no release from the owner saying commercial operation has begun, and their status says so. Every figure’s source is on the battery’s page.

1,720 MW is being built, led by GIGA Storage’s 700 MW Green Turtle at Dilsen-Stokkem

The batteries being built would take the fleet to 2,548 MW if every one is finished. Their owners give dates from the start of 2027 to 2028, and battery projects in Belgium have run late before: Nala Renewables’ Balen battery was due at the end of 2022 and entered Elia’s list in November 2025.

Announced, and not confirmed

Announced by their owners and not yet being built, or due to have started with no source saying they run.

The owners with the most scheduled or running

Who builds them

Tesla is named on 9 of the 35 batteries. A battery with two firms named counts for each.

What is not here, and why

The batteries on the distribution grids, except the ones an owner has named, because Elia’s list holds only the units it schedules and no distribution company publishes a list battery by battery; Fluvius gives only totals. A meter on any battery below 100 MW, because ENTSO-E’s rules require it only above that size. What each battery draws when it charges, because the meter ENTSO-E publishes is output only. The winners of Elia’s capacity auctions battery by battery, because Elia’s auction reports may not be reproduced without its permission, which we asked for on 19 October 2026. A connection queue, because Elia publishes none battery by battery. Prices: the Belgian day-ahead price is on the European prices page. Nothing on this page is modelled, and a connection figure is never passed off as a battery’s size.

Sources: Elia Transmission Belgium open data, ods179, Elia Open Data Licence. ENTSO-E Transparency Platform, 16.1.A and 16.1.B&C, Belgium. The named batteries from be/hand/batteries.csv, kept by hand from owners’, developers’ and builders’ own releases and the trade press, every fact with its web address. Places from GeoNames (CC BY 4.0) and OpenStreetMap (ODbL).