Finnish city fills old gravel pit with 100 million gallons of water to store heat

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The Finnish city of Hyvinkaa is undertaking a large project to fill a former gravel pit with 100 million gallons of water. The water will serve as a thermal energy store. Once operational, the facility is expected to supply about a quarter of the city's heating needs during the colder months. Construction is set to run until late April 2027. Charging of the system is expected to begin by late summer 2027.

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