21/02/2026
Energy from sand? A perfect fit for the Netherlands 🇳🇱
The Netherlands has long been a European leader in the energy transition.
Wind turbines, rooftop solar, ambitious climate targets - all of this is already reality.
But there is one key challenge the country is facing:
What do we do with surplus energy when the wind is blowing and the sun is shining, but demand is low?
The answer might be surprisingly simple: energy storage in sand.
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Dutch realities: lots of renewables, little stability
In the Netherlands:
- a large share of electricity comes from onshore and offshore wind
- solar PV is rapidly expanding on homes and industrial buildings
-the electricity grid increasingly suffers from congestion (netcongestie)
The result:
- electricity is available, but not always when it’s needed
- at the same time, demand for heat remains high, especially in buildings
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How does sand energy storage work?
This is a form of thermal energy storage, well suited to Dutch conditions.
1. Surplus electricity (from wind farms or solar panels)
2. Is converted into heat
3. The heat is stored in sand inside a well-insulated container
4. Energy can be stored for days or even weeks
5. When needed, the heat is supplied to heating systems or district heating networks
Key characteristics:
- operating temperatures up to 500-600°C
- very low energy losses
- no degradation typical of chemical batteries
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Why is this ideal for the Netherlands?
- strong development of district heating (warmtenetten)
- ongoing phase-out of natural gas in buildings
- limited availability of affordable large-scale energy storage
- frequent curtailment of wind and solar due to grid limitations
Sand-based heat storage can act as an energy buffer for entire neighbourhoods.
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Why sand?
- cheap and widely available
- non-toxic and safe
-resistant to extremely high temperatures
- no rare earth metals
- lifespan measured in decades
It fits well with the Dutch approach: practical, scalable and reliable.
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This is already reality - not just theory
In Finland, the company Polar Night Energy has launched an industrial-scale “sand battery” supplying heat to a local district heating network.
This proves that:
- the technology is mature
- city-scale applications are feasible
- integration with heat networks works in practice
In Dutch cities - with dense urban areas and expanding heat networks - the potential may be even greater.
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Where does this make the most sense in the Netherlands?
- residential districts connected to warmtenetten
- industrial and logistics sites
- areas near wind farms
- new gas-free housing developments
We don’t always need to store electricity in batteries.
In many cases, what we need most is a cheap and stable way to store heat.
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Time to look at energy differently
Sand energy storage shows that:
- the energy transition is not only about electricity
- heat is a critical part of the system, especially in the Dutch climate
- simple technologies can have a major impact
Perhaps sand, today seen mainly as a construction material,
could become one of the foundations of a stable, gas-free energy system in the Netherlands.
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What do you think?
Does sand-based energy storage make sense for Dutch cities?
Share your thoughts or pass this post on if you find the idea interesting.
