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- Storing heat underground is effective because the ground acts as a great insulator.
- Mälarenergi in Sweden is using underground caverns to store heat for several weeks.
- The system should be stable once the temperature of the adjacent soil increases.
- The heat from people and trains in London's metro has raised the temperature of the surrounding clay, making it difficult to cool the trains and platforms.
- Finland's Helen company has a similar system in place, supplying heat to 25,000 apartments.
- A significant number of abandoned coal mines in the UK are naturally warm and could be used to heat nearby homes.
- The water from these mines could be further heated using a heat pump system before being distributed to homes.
- Heat exchangers could be used to prevent contaminants from the mine water from entering the domestic supply.
- These solutions are considered great by experts.
- The text focuses on the use of underground heat storage as a sustainable and efficient way of heating homes.
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