alt Hacker NewsIt ought to be cheaper at scale. Batteries' cost scales linearly with storage capacity. Cost for a plant like this scales linearly with the storage rate - the compressor and turbine are the expensive part, while the pressure vessels and gas bags are relatively cheap.
The bigger you build it, the less it costs per MWh of storage.
> Energy Dome expects its LDES solution to be 30 percent cheaper than lithium-ion.
Grid scale lithium is dropping in cost about 10-20% per year, so with a construction time of 2 years per the article lithium will be cheaper by the time the next plant is completed