In Vasteras, Sweden, an underground system of tunnels, originally constructed during the Cold War for oil storage, now functions as a heat battery. This innovative setup supports the city's district heating system, critical during harsh winters. The co-generation power plant burns waste and wood to provide both heat and electricity for 98% of Vasteras households. This method is twice as efficient as traditional power generation and ensures residents enjoy warmth year-round, even in summer.
"It's a very efficient way to use fuel," says Lisa Granstrom, who is in charge of the heat and electricity strategy at Malarenergi, the city-owned energy company that runs the power station.
Co-generation power plants, such as this one in Vasteras, produce both heat and electricity, using the same heat to spin a turbine that would otherwise go to waste.
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