With a volume of 300,000 cubic meters, an old oil depot is transformed into a giant thermos, heating an entire city in Sweden and potentially changing the way energy is stored worldwide.

Written by Flavia Marinho

Published on 28/03/2026 at 00:53

Updated on 02/05/2026 at 20:51

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Old oil depot starts functioning as heat storage, allowing energy to be stored in the form of hot water and heating thousands of residents for several consecutive days

An old oil depot in Sweden is being transformed into something unexpected. The site is now functioning as a large heat storage system, capable of heating an entire city. The idea draws attention because it prevents energy waste. Instead of losing excess heat, it is stored for use when the city really needs it.

The information was released by Reuters, a reliable global news agency. The project is taking place in Västerås, a city with about 130,000 residents.

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Simple idea transforms heat into “reserve” for cold days

The operation is easier to understand than it seems. The system stores heat in the same way a thermos keeps coffee hot.

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Giant space equals thousands of full swimming pools

The size of the site is impressive and helps to understand the impact of the project. The caverns have a total volume of 300,000 cubic meters, excavated in the 1970s.

To visualize better, this is equivalent to about 6,000 backyard swimming pools full. It is an enormous amount of water that can be kept hot.

The capacity reaches approximately 13 GWh of energy, enough to supply heating for several consecutive days.

City can stay warm for days even without producing heat

The system creates a kind of reserve ready for immediate use. This brings more security during periods of intense cold.

On very cold days, the stored heat can last up to an entire week. In milder periods, it can last about two weeks.

Cogeneration plants, like the one in Västerås, manage to utilize up to **90% of the energy used**, reducing waste and increasing system efficiency

Reuters, a reliable global news agency, highlighted that this reduces the use of extra plants that use polluting fuels.

Old oil depot gains a new function without needing to build everything from scratch

The site already existed and had been abandoned since it stopped storing oil. Now, it is undergoing adaptations to fulfill a new function.

Pipes are being installed to carry and bring heat. Concrete areas are also being made to completely seal the caverns.

This repurposing prevents waste and makes use of a space that was already available, without the need for new excavations.

Solution helps tackle one of the biggest challenges in energy

Storing energy for later use is still a problem in many countries. What is produced is not always used at the same moment.

This type of solution allows for better utilization of what has already been generated. Thus, less energy is lost over time.

The project shows how simple ideas can have a direct impact on daily life. Especially in places where the cold requires a lot of heating.

The transformation of the old depot thus creates a large reserve of heat ready for use. This helps reduce costs and also dependence on more polluting sources.

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With a volume of 300,000 cubic meters, an old oil depot is transformed into a giant thermos, heating an entire city in Sweden and potentially changing the way energy is stored worldwide.

Old oil depot starts functioning as heat storage, allowing energy to be stored in the form of hot water and heating thousands of residents for several consecutive days

Simple idea transforms heat into “reserve” for cold days

Giant space equals thousands of full swimming pools

City can stay warm for days even without producing heat

Old oil depot gains a new function without needing to build everything from scratch

Solution helps tackle one of the biggest challenges in energy

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With a volume of 300,000 cubic meters, an old oil depot is transformed into a giant thermos, heating an entire city in Sweden and potentially changing the way energy is stored worldwide.

Old oil depot starts functioning as heat storage, allowing energy to be stored in the form of hot water and heating thousands of residents for several consecutive days

Simple idea transforms heat into “reserve” for cold days

Giant space equals thousands of full swimming pools

City can stay warm for days even without producing heat

Old oil depot gains a new function without needing to build everything from scratch

Solution helps tackle one of the biggest challenges in energy

While an average building in London or New York takes three years to be completed, in China a 26-story tower went up in five days with about 100 workers, and the global modular construction market already moves US$ 95 billion per year.

Australia installs giant concrete structures on the seabed 800 meters from the shore to create an ocean intake for desalination that will draw in saltwater and produce 30 million liters of drinking water per day.

While a traditional school may take several days just to raise walls, in Malawi a 3D-printed school had its structure ready in 18 hours, welcomed children in June, and showed a new solution to the lack of classrooms.

Goodbye traditional washing machine: Panasonic surprises housewives with the NA-G5 featuring four drums, a 13 kg washer and dryer, a 12 kg dryer, independent mini washers, a heat pump, and a 4-in-1 system awarded at the German Design Award.

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