I appreciate the focus on technological simplicity, cost-effectiveness and environmental cost. Yes, the battery itself isn't as efficient (per m^3) as a chemica

I appreciate the focus on technological simplicity, cost-effectiveness and environmental cost. Yes, the battery itself isn't as efficient (per m^3) as a chemical one, but the basic engineering and well-established supply chains behind setting one up will reap gains in themselves and means scaling up will be much less challenging. Even the turbine add-on is well understood engineering at this stage. I imagine these could be used to buffer the output from wind turbines or solar plants?