MIT engineers created a carbon-cement supercapacitor that can store large amounts of energy. Made of just cement, water, and carbon black, the device could form the basis for inexpensive systems that store intermittently renewable energy, such as solar or wind energy.
Higher energy density is going to be needed for sure, but as a brutalism evangelist, I’m gonna take this chance to say we could just make the whole building out of concrete so it’s all one big battery.
As a solarpunk evangelist, put these at the bottom of canals that are covered with solar panels, so they can store their own energy.