@jago @janrosenow There are already several #CavernThermalEnergyStorage sites in Finland but most are repurposed oil bunkers. This makes them cheaper.
Helsinki 300.000m³
https://www.helen.fi/en/news/2021/gigantic-heat-caverns-in-mustikkamaa-filled
Vaasa 210.000m³
https://www.epv.fi/en/project/storing-heat-and-power/
Oulu 190.000m³
https://www.oulunenergia.fi/ajankohtaista/blogi/lampoakku-lammittaa-koteja-talvella/
There is also a large 500.000m³ #PitThermalEnergyStorage site planned in Hyvinkää. Costing 20M€ it is close to the Danish 30€/m³ benchmark.
https://yle.fi/a/3-12600680
@jago @janrosenow
The #PitThermalEnergyStorage PTES solution used in Denmark appears significantly cheaper than #CavernThermalEnergyStorage CTES which is popular in Finland.
The 200.000m³ #PTES in Vojens costs about 30 €/m³ whereas #CTES #Varanto in Vantaa costs 200 €/m³.
However, PTES is not pressurised and thus limited to 95°C while #Varanto CTES reaches 140°C, increasing both storage capacity and value of heat.
https://solarthermalworld.org/news/seasonal-pit-heat-storage-cost-benchmark-30-eurm3/
https://solarheateurope.eu/2020/05/19/vojens-district-heating/
https://www.sciencedirect.com/topics/engineering/pit-thermal-energy-storage
Construction of the world's largest heat storage facility #Varanto to begin in June in Vantaa, Finland. Surplus heat from the adjacent Waste2Energy plant in summer can be stored for winter use. This #CavernThermalEnergyStorage also features two 60 MW electric boilers to use cheap #WindPower when available.
90 GWh, Tmax 140 °C, water volume 1.100.000 m2 cost 200 M€ incl. 19 M€ govt. grant, but no updates on schedule
#SeasonalStorage
#VECTES
https://www.vantaanenergia.fi/vantaan-energia-aloittaa-maailman-suurimman-lammon-kausivaraston-varannon-rakentamistyot-vantaalla/
https://afry.com/en/newsroom/news/planning-worlds-largest-seasonal-heat-storage-well-under-way
Henri Horn
Henri Horn
