I think the answer is to use surplus energy to make and store hydrogen. The combine that with implementation of hydrogen powered vehicles in the large transport

I think the answer is to use surplus energy to make and store hydrogen. The combine that with implementation of hydrogen powered vehicles in the large transport sector (trains and long haul trucks) would be a good way to store and make use of energy without building massive energy storage devices. Battery electric is already a bad fit for those sectors, since the heavy batteries significantly reduce useful transportation weight and long charging times mean expensive delays in moving goods. It would also help build out hydrogen distribution networks, which could be strategically installed at transportation hubs and along strategic routes to start, which then could be utilized by local transportation, making them more viable using hydrogen where battery electric isn’t as feasible (local buses and delivery trucks that can refill hydrogen in a few mins to run with minimal downtime).