This data-file calculates the economics and energy consumption of cryogenic air separation units, important in the production of industrial gases for metals, materials and medical applications. But air separation units also explain c1% of global energy use.
We estimate an oxygen price of $120/ton is required for a new air separation unit to generate a 10% IRR. You can stress-test the economic sensitivities in the data-file.
The largest cost component is electricity. Hence using air separation units flexibly to absorb intermittent renewables (note here) makes excellent sense, from both the perspectives of economics and CO2 emissions.