The difference in one table
| Item | Fixed contract | Dynamic contract |
|---|---|---|
| Electricity price | Fixed tariff for a set period, for example 1 or 3 years (ACM) | Linked to the wholesale market (ACM); the tariff can change per quarter-hour or per hour and you know the tariffs a day ahead |
| Feed-in fee | Stated in your contract; your supplier may not change it | Depends on the current electricity price, which can differ per quarter-hour or per hour |
| What the battery can do | Store solar power for your own use | Store solar power for your own use, and with a suitable battery or app charge when electricity is cheap and discharge when it is expensive. See home battery and dynamic contract |
| Predictability | High: the tariff per kWh does not change during the term | Lower: when prices rise or fall, you notice it immediately |
| Cancelling | According to your contract | No cancellation fee |
What does the research show?
CE Delft, commissioned by Vereniging Eigen Huis (the Dutch homeowners association), followed home batteries at thirteen households for a year (report of January 2026). Two results matter for your contract choice.
First result: without net metering, a dynamic contract with a home battery was financially more favourable than or about equal to the net total energy costs under a fixed contract in all test setups. In eight of the thirteen setups the net costs under a dynamic contract were lower, in five about equal.
Second result: the saving from the battery was larger in euros under a fixed contract. CE Delft explains it this way: under a fixed contract the electricity price is higher on average, so the saving in energy costs with a home battery is also larger in absolute terms. The figures are below for the two setups with a battery that only worked on own consumption.
| Setup | Fixed contract | Dynamic contract |
|---|---|---|
| 5 kWh battery, average consumption (3,600 kWh) | € 350 | € 217 |
| 10 kWh battery, very high consumption (11,000 kWh) | € 947 | € 602 |
A larger saving is not the same as lower costs
A larger saving from the battery therefore does not mean you pay less in total. Look at your whole energy bill, not only at what the battery saves.
CE Delft also states that it is hard to say when a dynamic contract is financially more favourable. It does not appear to be linked to the type of battery algorithm, and presumably depends on factors such as the moments of energy use, the algorithm, the storage capacity and household consumption. These are also results from one year, and past results offer no guarantee for the future.
Whether a battery pays off for you is covered in is a home battery worth it.
Which contract fits your battery?
Which batteries list dynamic control is covered in home battery and dynamic contract: which models.
| Your battery and situation | Fits better | Why |
|---|---|---|
| Works only on your own solar power (charges with surplus, discharges when you use power) | No big difference; choose on certainty or price | In the two self-consumption setups in the study, total costs without net metering were about equal. That is only two setups, so treat it as an indication. |
| Can charge and discharge on the hourly price itself (app or energy management system) | Dynamic can fit | Only then can the battery play on the price differences. An advantage is not automatic, see home battery and dynamic contract. |
| You want fixed monthly costs and no price risk | Fixed | Your tariff per kWh is fixed for the term and your supplier may not change your feed-in fee. |
| Battery control is tied to one supplier | Read the terms first | If you switch, your home battery can probably no longer use the computer program. The battery does keep storing the energy you generate yourself. More in home battery and dynamic contract. |
What does the law say about feeding back after 2027?
The net metering scheme ends on 1 January 2027. After that the following applies to fixed and dynamic alike.
You get a reasonable feed-in fee. Until 1 January 2030 it is at least 50% of the price you pay for electricity without energy tax and VAT. In the law this is article 2.34, ninth paragraph, of the Energiewet: not less than 50% of the price agreed for the electricity to be supplied.
With a small connection the fee may not, weighted on average over a period of one month, be set at a negative amount (article 2.34, seventh paragraph).
Your supplier may charge feed-in costs, and these can sometimes be higher than the fee. You can read more in feed-in costs. How the rules fit together on 1 January 2027 is explained in net metering ends in 2027.
With a dynamic contract your price can differ per quarter-hour or per hour. Ask your supplier how it applies the statutory minimum to your contract. A battery helps in both cases: solar power you use yourself does not have to be fed back.
Double energy tax with a home battery: announced, no scheme yet
With storage in a home battery, energy tax can be charged more than once on the same electricity. A motion in the House of Representatives of 3 June 2026 asked the government to present, at the latest with the 2027 Tax Plan, a workable scheme or preferred option that prevents this.
According to the cabinet letter of 8 October 2026, the Ministry of Finance and the Ministry of Economic Affairs and Climate Policy are looking for a solution for the situation after 2026 together with the sector. That is an intention: there is no scheme in force now. Status as of 18 October 2026: announced. You can read more about charging from the grid in home battery without solar panels.
Which battery fits your contract?
Want to know which battery fits your contract? Try the battery match or look at the batteries in the shop.
Sources
- CE Delft: Test setups for home batteries, Vereniging Eigen Huis (report, in Dutch): January 2026, publication no. 2026.240329.004, sections 2.3.1 and 3.7: saving € 350/€ 217 and € 947/€ 602, total costs without net metering lower or about equal with dynamic (accessed on 2026-10-18)
- CE Delft: Test setups for home batteries (publication page): commissioned by Vereniging Eigen Huis, thirteen households, one year of data (accessed on 2026-10-18)
- Staatsblad 2025, 17: Act ending the net metering scheme (Energiewet art. 2.34 paras 7 and 9): until 1 January 2030 not less than 50% of the agreed price, fee not negative on a monthly weighted average for a small connection (accessed on 2026-10-18)
- ACM ConsuWijzer: Net metering and feeding back: net metering ends 1 January 2027, fixed tariff: fee may not change, dynamic: current price per quarter-hour or hour, at least 50% until 2030, feed-in costs (accessed on 2026-10-18)
- ACM ConsuWijzer: Tailor-made offers: tariffs known a day ahead, per quarter-hour or hour, no cancellation fee for variable and dynamic tariffs (accessed on 2026-10-18)
- ACM ConsuWijzer: Fixed and variable supply costs: dynamic tariff linked to the wholesale market, fixed tariff for a set period (accessed on 2026-10-18)
- ACM ConsuWijzer: Tips for choosing an energy supplier: energy contract tied to a home battery, control probably falls away after switching (accessed on 2026-10-18)
- House of Representatives: motion Van den Berg and Boomsma (no. 694): request to prevent double energy tax on home batteries by the 2027 Tax Plan at the latest, submitted 3 June 2026 (accessed on 2026-10-18)
- Cabinet: letter on the 500-rule approach, 8 October 2026: a solution for double energy tax on small-scale connections after 2026 is being sought, reference 2026-0000527884 (accessed on 2026-10-18)
