Looking at the technology trajectories of PV and wind it is pretty clear that within the next 5 to 15 years many countries will start seeing substantial extra electricity being generated by the build out of renewables. Because countries will aim to cover most electricity by renewables and thus overprovision them for dark windless winters, it is likely that there will be massive amounts of energy available during the summer and windy times in spring/autumn.

At this point the technology which is best in converting surplus electricity in something which counteracts climate change is most likely to become relevant.