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   Nemo_bis 🌈 (nemobis@mamot.fr)'s status on Friday, 22-Nov-2024 16:02:10 JST Nemo_bis 🌈

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   • K. Ryabitsev ????

   @monsieuricon The district heating in #Helsinki has a 320 million liters heat battery in a cavern. https://www.helen.fi/en/news/2021/gigantic-heat-caverns-in-mustikkamaa-filled

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     K. Ryabitsev ???? (monsieuricon@social.kernel.org)'s status on Friday, 22-Nov-2024 16:02:11 JST K. Ryabitsev ????
     My other idea is using insulated tanks of distilled water buried in the ground for residential peak shaving. Overnight, the water is heated to 90°C using cheap excess capacity. During the morning peak, the heat pump uses it as a source of readily available heat for central heating. You can even have a fully mechanical heat pump "trickle-heating" the water during the night from a small wind turbine, since you just need to run the compressor and move the liquids around. There should be enough wind to heat up a tank of water even with a small backyard turbine.
     
     I'm a complete dilettante in this, so I'm probably missing 99 reasons why this would be a lot more difficult.