In addition to sand batteries, Finnish utilities are also building the world's largest #CavernThermalEnergyStorage in Vantaa (1,1 million m³)
www.vantaanenergia.fi/en/about-us/projects/varanto-the-cavern-thermal-energy-storage/
and the world's largest #PitThermalEnergyStorage in Hyvinkää (380.000 m³)
hlv.fi/lampovarastohanke/
#SectorCoupling