Compressed gas storage scales better than any battery chemistry. Energy Dome claims >75% round-trip efficiency [0], and just inked a deal with Google [1].

[0]https://www.pv-magazine-australia.com/2025/03/12/energy-dome... [1]https://energydome.com/energy-dome-inks-a-strategic-commerci...

Once R&D costs are covered, capacity scales with the size of the gas bag. Without competition from EVs or the volatility of resource extraction markets there's a clear path to profit here for 10hr+ grid-scale energy storage.