6 FAQs about EU Energy Storage Supercapacitor Quote

Are supercapacitors a good choice for energy storage?

In terms of energy storage capability, the commercially accessible supercapacitors can offer higher energy density (e.g., 5 Wh kg −1) than conventional electrolytic capacitors, though still lower than the batteries (up to ≈1000 Wh kg −1).

Why is energy storage important in the EU?

It can also facilitate the electrification of different economic sectors, notably buildings and transport. The main energy storage method in the EU is by far 'pumped hydro' storage, but battery storage projects are rising. A variety of new technologies to store energy are also rapidly developing and becoming increasingly market-competitive.

Do supercapacitors have a high energy density?

1) The energy densities of electrochemical capacitors are not high. Currently, there remains a noticeable gap between the energy densities of supercapacitors (<20 Wh kg −1) and batteries (30–200 Wh kg −1). [474 - 476] Improving energy storage density continues to be a key research focus and challenge in the field of supercapacitors.

What is a supercapacitor based on?

A supercapacitor has owned some internal resistance, resulting in energy loss. It can be modeled as a system consisting of a capacitor in series with a resistor (RES), as depicted in Figure 10. The RES is the resistance of the electrochemical capacitors and is important in reflecting the energy efficiency and power performance of supercapacitors.

What is the European energy storage inventory?

In March 2025, the Commission launched the European Energy Storage Inventory, a real-time dashboard that displays energy storage levels across different European countries. It is the first European-level tool of its kind and offers energy storage data across a full range of technologies.

Will Sweden introduce a new capacity market mechanism in 2028-2029?

The Swedish government plans to introduce a new capacity market mechanism in 2028-2029 to support the further development of the energy storage market. The Swiss energy storage market is expected to grow from 318 MW in 2023 to 1.3 GW in 2030.

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