Trading on the imbalance or EPEX market with a home battery: how it works

The energy market is changing rapidly. Where households once simply drew power from the grid, a world is now emerging in which consumers can actively participate. Thanks to smart technologies like home batteries , dynamic energy contracts, and Energy Management Systems (EMS), you can benefit from low and high prices on markets like the EPEX Day-Ahead market and the imbalance market .

In this blog post, we explain what these markets are, how trading with a home battery works, and how you can further reduce your energy bill. Advanced systems like the Sigenergy SigenStor are specifically designed to optimally capitalize on these price differences.

What is the EPEX market?

The EPEX (European Power Exchange) is the wholesale market where electricity prices are determined hourly. Energy producers, suppliers, and traders purchase electricity there for the following day.

These are the prices on which dynamic energy contracts are based:

  • Low demand + high production → low price
  • High demand + low production → high price

With a home battery you can respond intelligently to these fluctuations by charging cheaply and avoiding expensive power moments.

What is the imbalance market?

The imbalance market is a real-time market where the grid operator (such as TenneT) continuously monitors the balance between supply and demand. If there's too much or too little power on the grid, prices are adjusted minute by minute.

Characteristics of the imbalance market:

  • prices change much faster than on the EPEX market
  • prices can become negative
  • in case of shortages prices can become extremely high

A smart EMS can dynamically charge or discharge based on these price fluctuations.

How can you trade a home battery on these markets?

A battery alone doesn't allow you to actively trade — for that, you need an EMS and an energy supplier that supports trading.

1. Charging at low prices

The EMS charges automatically when:

  • EPEX hourly rates are low
  • imbalance prices are negative
  • there is a lot of wind or solar energy available

2. Discharge at high prices

When electricity is expensive, the battery can:

  • supply your home with energy (so you don't have to buy anything)
  • or supply electricity back for a fee

3. Smart automation via EMS

The EMS decides automatically:

  • when to charge
  • when to discharge
  • how much energy to store
  • which market is most advantageous at that time

4. Save and possibly earn

  • cheap shopping
  • avoid expensive consumption
  • profit from market peaks
  • shorter payback period of the battery

Practical example: a trading day

Situation: home battery 10 kWh, charge/discharge power 5 kW.

Morning – low EPEX prices:
The price is €0.05/kWh → battery is fully charged.

Afternoon – solar peak:
Solar panels further charge the battery and power the home.

Evening – high prices:
The price rises to €0.30/kWh → the battery discharges and you don't buy expensive electricity.

Imbalance moment:
There is a shortage on the grid → price shoots up → battery delivers extra power and you earn money with it.

Why trading with a home battery is interesting

  • Lower energy bills through smart purchasing and use
  • Faster payback time of the battery
  • Higher self-consumption of your own solar energy
  • Contribution to grid stability during peak times

What do you need to be able to trade?

  • A home battery with sufficient kW and kWh
  • An EMS that can act automatically
  • A supplier that supports imbalance trading
  • A smart meter for real-time data

Advanced battery systems such as the Sigenergy SigenStor have been specially developed for these types of dynamic applications.

Risks and points of interest

  • Faster wear due to many loading cycles
  • Market volatility → prices can fluctuate widely
  • Regulations → some trade is only allowed through suppliers

A good EMS takes this into account and optimizes charging profiles to protect the battery.

Conclusion: trading on the energy market is becoming the new standard

With a home battery, you can not only store energy but also actively benefit from price fluctuations in the energy market. The combination of:

  • home battery
  • EMS
  • dynamic energy contract

enables consumers to participate in markets that were previously only accessible to professionals.

Want to know which home battery and EMS is best suited for your situation? Check out smart solutions like the Sigenergy SigenStor at aboutwatt.com.

Which battery is right for you?

Use our handy calculator

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