Gravity storage is an absolute joke. About the cheapest substance you can use is iron ore because it reduces the size and cost of the frame, and if you had ever

Gravity storage is an absolute joke. About the cheapest substance you can use is iron ore because it reduces the size and cost of the frame, and if you had everything else for free it would still cost you over $70/kWh for a box of it to store 1kWh in a 500m high tower. Renewables with straight gas backup and no other storage are already lower carbon than any other option, and batteries and off river PHES have only just started getting cheap. The breakthroughs we need to cover the final gap have already been made if you're paying any attention at all. Stop concern trolling