minus-squarefullsquare@awful.systemstoTechnology@beehaw.org•A Finnish town is heating itself with 2,000 tonnes of crushed rock: its giant “sand battery” can cover almost a month of heating demand and has cut district heating emissions by 70%linkfedilinkarrow-up4·2 months agothat’s no problem at all, systems like that are in use linkfedilink
minus-squarefullsquare@awful.systemstoTechnology@beehaw.org•A Finnish town is heating itself with 2,000 tonnes of crushed rock: its giant “sand battery” can cover almost a month of heating demand and has cut district heating emissions by 70%linkfedilinkarrow-up6·2 months agoIt’s easier to freeze water than to cool rock borehole linkfedilink
minus-squarefullsquare@awful.systemstoSelfhosted@lemmy.world•A solar powered website that goes offline when there's no powerlinkfedilinkEnglisharrow-up1·2 months agoLead-acid batteries work if you don’t care about weight and lithium-iron phosphate if you do linkfedilink
that’s no problem at all, systems like that are in use