How much more would your battery earn?
Pick your zone and battery power. You get the extra day-ahead revenue per year with our forecast, compared with planning on yesterday’s prices — simulated over the last year on real cleared prices.
Your battery
Extra day-ahead revenue vs planning on yesterday’s prices
≈ €10,162 per year
95 % confidence interval of the yearly average €8,319 – €12,263. Simulated on past prices (backtest) over 366 days (7 Nov 2025 – 7 Nov 2026), before fees, day-ahead only.
Share of the best possible result (prices known in advance): our forecast 90.5 %, yesterday’s prices 79.5 %. Planning on yesterday’s prices lost money on 23 of 366 days.
For a 2-hour battery (1 MW / 2 MWh); other durations: ask us. Figures scale linearly with power from a 1 MW / 2 MWh reference battery.
Battery plan: a daily schedule for this batteryRevenue figures are simulated on past prices, not guaranteed. You can link to a result: add ?zone=CZ&mw=5 to the address.
What the number means
A battery on the day-ahead market earns by charging when prices are low and discharging when they are high. The plan has to be made before the 12:00 CET auction, so it can only be as good as the price forecast behind it. The simplest plan is to assume tomorrow looks like today. Our forecast replaces that guess. The calculator shows the difference between the two over a full year: the median across European zones is about €10,924 per MW per year.
How accurate the forecast is, day by day: forecast accuracy in Germany. A full example: case study of a 10 MW / 20 MWh battery.
Frequently asked questions
How is the yearly figure calculated?
For every day of the last year we plan the battery twice with the same optimiser: once on our forecast as it would have been made before the 12:00 CET auction, once on yesterday’s prices at the same local time. Both plans are settled at the actual day-ahead prices. The figure is the difference over the year, per MW.
What battery does it assume?
A 2-hour battery (1 MW / 2 MWh reference, scaled linearly to your size), 88 % round-trip efficiency, wear cost €10 per MWh discharged, state of charge 50 % at the start and end of each day. Day-ahead market only, before fees, grid charges and taxes.
Is this what my battery will earn?
No. It is a simulation on past prices (backtest), not a guarantee. It shows how much better a plan on our forecast would have done than a plan on yesterday’s prices. Real revenue depends on your battery, fees and whether you also trade intraday or balancing.
Why is the figure so different between zones?
Zones with large and unpredictable day-to-day price swings gain the most from a better forecast. Where yesterday’s prices are already a good guide, the gain is smaller. Each zone also shows on how many days planning on yesterday’s prices lost money.