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MAVIR, the Hungarian transmission system operator, publishes the measured charging and discharging of grid-scale batteries every quarter-hour, but not in real time: a day's data usually appears one or two days later. That is why this page shows the latest complete measured day. Capacity is the installed capacity that MAVIR can observe; home batteries are not included.
How much do they matter?
Charging at noon, discharging in the evening
How much would a battery earn?
Over a year
The price spread is only one source of revenue. The other is ancillary services: MAVIR buys reserves (FCR, aFRR), and this is where batteries' speed pays off. As they moved in, the price fell: the monthly volume-weighted FCR price was 5,400–30,200 HUF/MW/h in 2024, and 2,400–11,000 in the first nine months of 2026 (MAVIR auction results, in Hungarian). On top of that, the winners of the 2024 RRF tender receive a revenue top-up for ten years (up to 160 €/kW a year; call for proposals, also in Hungarian).
The boom
Records
Where are they?
Click a battery — or tab to it and press Enter.
The area of the circle is the battery's energy (MWh); the inner disc shows its power (MW). The exact site is not always public, so the marker sits on the town or village.
To scale
The scale is logarithmic: each step is ten times the last — otherwise the home battery would not show up at all.
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The old, large-scale way of storing energy is the pumped-storage plant: in cheap hours water is pumped up into a mountain lake, and in expensive hours it is let back down. Hungary has none. One at Prédikálószék, above the Danube Bend, had been on the drawing board since the 1970s — the 1988 plan assumed 600 MW and 3.6 GWh (Telex, 2026) — but it was dropped in July 2023; studies of Markaz in the Mátra hills and of Bistrica-2 in Serbia began instead (Telex, 2023; both in Hungarian). The neighbours do have them: Čierny Váh in Slovakia (735 MW, SITA), Velebit in Croatia (276 MW, Wikipedia) and Bajina Bašta in Serbia (EPS).
At home
There is no measured data on home batteries, and no official total of how many there are. Since 29 August 2026, every stationary battery above 2 kWh has to be registered, and existing ones by 30 June 2027 (Government Decree 131/2026, Greenergy, in Hungarian) — that is where the data will eventually come from.
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The battery has to be remotely controllable; the deadline is 26 February 2027. Sources: Telex, HVG (28 September 2026, in Hungarian).
Where's the sun? What are your solar panels doing right now?holanap.hu →Sources
- MAVIR — measured charging and discharging and the observable capacity of grid-scale batteries (quarter-hourly and daily), solar power, consumption and nuclear generation — from the data export on MAVIR's website (on the publication of the storage data: villanylap, 18 August 2026, in Hungarian).
- energy-charts.info (Fraunhofer ISE) — the exchange price (HUPX day-ahead): Bundesnetzagentur | SMARD.de, CC BY 4.0, unmodified.
- Projects, tenders, legislation — cited item by item on the map and in the timeline.
- Households — 2,082 kWh a year (KSH, the Hungarian Central Statistical Office, 2024; the same constant as on holadelej.hu and holanap.hu).
- Borders — the map from holaszel.hu.
- Methodology — where the data comes from, how we calculate, glossary and frequently asked questions.