How does a home battery earn on the imbalance market?

By Stefan Douw · Maker of Stekkerkompas

Grid operator TenneT keeps the power grid balanced every quarter hour. When demand or supply deviates from the forecast, for example because the weather changed, TenneT pays to correct that gap. On this imbalance market prices react in real time, not once a day like the day-ahead price.

How it works

You need a battery with a smart control system and a supplier that offers imbalance-market trading. The system charges automatically when the price is low and sells when it is high. You do nothing yourself.

Why you should budget cautiously

This is the most uncertain earning stream. It was higher in 2023 and 2024, fell in 2025, and in 2026 it is lower and less predictable. The reason is market saturation: the more batteries take part, the smaller the price swings and the yield. The income is also taxed.

The Dutch consumer authority ACM explicitly warns that sellers paint the yield too rosily, the imbalance market especially, and that a four-to-seven-year payback is often not achievable. If you borrow for a battery, take extra care.

How we model it

We use a cautious, declining range and show a band instead of one flattering figure. Run your own situation in the calculator and set the imbalance yield to cautious to see how sensitive the result is.

Estimate the trading-yield band

Usable capacity: 10 kWh

€400 /yr

Cautious

€700 /yr

Expected

€950 /yr

Optimistic

Indicative, trading only, before power and throughput limits. Your real number depends on your contract and battery; run it in the calculator.

Calculate for my situation

Sources

ACM – Waarschuwing voor onduidelijke reclames thuisbatterijen