The value of the electricity can be measured by comparing it to the value of a petroleum product. transportable energy can be made using from CO2 in the air using Fischer-Tropsch.

It's energy intensive, and uneconomic - which is why people are stringing HVDC links across bodies of water - Denmark/Sweden, Australia/Tasmania, NZ North/South Islands instead.

https://en.wikipedia.org/wiki/Fischer%E2%80%93Tropsch_proces...

https://en.wikipedia.org/wiki/List_of_HVDC_projects