If you own a home in Sweden or elsewhere in Europe, your electricity bill is about to change. Grid operators are rolling out power-based tariffs (known as effekttariffer in Swedish) that charge you not just for how much energy you use, but for how fast you use it. The higher your peak demand in a given month, the more you pay.
Peak shaving is the practice of reducing those demand spikes so your monthly power charge stays low. And a home battery is one of the most effective tools to do it.
How Traditional Grid Fees Work
For decades, residential grid fees in Sweden have been based on three components: a fixed annual charge, a variable fee per kilowatt-hour consumed, and a subscription tier linked to your main fuse size (typically 16A, 20A, or 25A for houses).
Under this model, it did not matter whether you used 5 kW steadily over two hours or pulled 10 kW in a single hour. Your bill was the same as long as total consumption matched.
That is changing.
Enter Effekttariffer: Power-Based Tariffs
Sweden's Energy Markets Inspectorate (Energimarknadsinspektionen, or Ei) issued regulations (EIFS 2022:1) requiring all grid operators to introduce a power component in their tariffs by 1 January 2027. Several operators have already started ahead of that deadline.
Ellevio, which serves the Stockholm region and parts of central Sweden, introduced effekttariffer on 1 January 2025. Their model charges 81.25 SEK per kW of peak demand during standard hours (06:00 to 22:00), measured as the average of your three highest hourly peaks each month. The fixed monthly fee is 365 SEK regardless of fuse size.
E.ON and Vattenfall Eldistribution are preparing similar tariff structures, with full rollouts expected before the 2027 deadline.
The logic is straightforward: the grid has limited capacity, and when everyone charges their EV, runs the heat pump, and cooks dinner at the same time (typically between 17:00 and 19:00), the strain on local infrastructure grows. Power tariffs create a financial signal to spread that load more evenly.
What Is Peak Shaving, Exactly?
Peak shaving means capping your maximum power draw during high-tariff periods. Instead of letting your household pull 8 kW when multiple appliances run simultaneously, you aim to keep it below, say, 5 kW.
There are two main approaches:
- Load shifting - Running appliances like dishwashers, washing machines, and EV chargers at off-peak times (nights and weekends).
- Battery discharge - Using a home battery to supply part of your electricity during peak hours, reducing how much you draw from the grid.
Both work. But load shifting requires you to change habits and plan around schedules. A battery automates the process.
How a Home Battery Handles Peak Shaving
A typical home battery system (5 to 15 kWh capacity) charges during low-demand periods, often overnight or during midday solar production, and then discharges when your household demand rises.
Here is a simplified example for a home on Ellevio's tariff:
Without battery: Your household peaks at 8 kW on a winter evening when the heat pump, oven, and EV charger all run together. Your three highest peaks average 7.5 kW. Monthly power charge: 7.5 x 81.25 = 609 SEK.
With battery (peak shaving): The battery covers 3 kW of that demand. Your grid draw peaks at 5 kW. Average of three highest peaks: 4.5 kW. Monthly power charge: 4.5 x 81.25 = 366 SEK.
That is a saving of about 243 SEK per month, or roughly 2,900 SEK per year, just from the power tariff component. According to Sourceful Energy's calculations, Stockholm homeowners can save approximately 2,925 SEK annually by reducing peak demand by 3 kW.
What Makes Peak Shaving Different from Other Battery Uses?
Home batteries can serve several purposes, and it helps to understand how peak shaving fits in:
- Self-consumption of solar: Using stored solar energy in the evening instead of exporting it to the grid. Primarily an energy (kWh) strategy.
- Spot price arbitrage: Charging when electricity is cheap and discharging when it is expensive. Depends on volatile hourly prices.
- Peak shaving: Specifically targeting power (kW) peaks to reduce demand charges. Works regardless of spot prices.
- Backup power: Keeping the lights on during outages. A resilience feature, not an economic one.
Peak shaving is particularly attractive under effekttariffer because the savings are predictable. You know the tariff rate, and you can estimate your typical peaks. It is less dependent on market volatility than spot price arbitrage.
Does It Work in Practice?
Yes, but the results depend on your consumption pattern and battery size. Homes with multiple high-draw appliances (EV chargers at 7 kW or more, heat pumps at 3 to 5 kW, induction cooktops) benefit most because they have the tallest peaks to shave.
A household with a modest and steady consumption profile may find that their peaks are already low enough that the savings from a battery do not justify the investment on peak shaving alone. In those cases, combining peak shaving with solar self-consumption and spot price optimisation makes the economics work better.
Smart energy management systems can help by coordinating battery charge and discharge cycles, scheduling appliance usage around tariff windows, and monitoring real-time grid draw. The Sourceful EMS, for instance, connects to batteries and other devices to optimise across multiple objectives at once.
A European Trend, Not Just Swedish
Sweden is not alone in shifting toward power-based tariffs. Spain introduced time-of-use tariffs with peak demand pricing in 2021. The Netherlands has capacity-based grid fees for residential customers. Germany is exploring similar reforms as part of its Netzentgeltstruktur (grid fee structure) review.
The EU's Electricity Market Directive (2019/944) encourages member states to implement dynamic pricing and demand-side flexibility. As more countries adopt these models, peak shaving with home batteries becomes relevant across Europe.
Getting Started
If you are considering peak shaving with a home battery, here are some practical steps:
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Understand your tariff. Check whether your grid operator has introduced effekttariffer. If not yet, they will by 2027. Look at the rate per kW and how peaks are measured (single highest hour, average of top three, etc.).
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Know your peaks. Review your hourly consumption data, usually available through your grid operator's portal or your smart meter. Identify when and why your peaks occur.
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Size the battery appropriately. For peak shaving, you need enough power output (kW) to cover the gap, not just storage capacity (kWh). A battery rated at 3 to 5 kW continuous discharge is typically sufficient for a Swedish villa.
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Consider combined value. Peak shaving alone may not pay for a battery. But when you add solar self-consumption, spot price optimisation, and potential grid services, the overall return improves significantly.
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Automate it. Manual peak shaving is impractical. Use a smart energy management system that can monitor your load in real time and dispatch the battery automatically.
The Bottom Line
Peak shaving is a straightforward concept with real financial benefits under the new tariff structures rolling out across Sweden and Europe. A home battery, paired with smart control, can reduce your demand charges by hundreds or even thousands of kronor per year.
As effekttariffer become the norm, understanding and managing your peak demand will be just as important as watching your total energy consumption. The households that prepare now will be the ones paying less later.
