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How to store energy for consumption peaks?

In Boras, Sweden, Veolia built a thermal energy storage tank to allow the city to cope with winter consumption peaks without using fossil fuels.


As early as the late 1950s, through its proactive environmental policy, Boras gradually began implementing virtuous energy models.
Recycling household waste, using biomass, recovering heat from wastewater and cogeneration are all solutions that have enabled Boras to become an exemplary sustainable city.
In 2010, the city went one step further in its energy transition by building the largest thermal energy storage unit in Europe.

Storing thermal energy to do away with fossil fuels

Nicknamed the "Thermos" by the inhabitants of Boras, the 80-meter high tank with a storage capacity of 37,000 m3contains water heated by the biomass and incineration facilities within the city’s thermal production plant. When district heating demand is lower than production, the reservoir stores unused hot water. Conversely, when there are surges in consumption the reservoir releases the stored energy. This solution smooths the production of energy and limits the use of fossil fuels. 7,700 tons of CO2 emissions are therefore avoided every year.

37,000 m3 of thermal energy storage

7,700 tons of CO2 emissions prevented per year

An exemplary sustainable city


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