If energy storage solutions were sufficient, there wouldn't be any negative priced energy!

Obviously, everyone who can store energy maxes out their battery banks during these times of negative-cost energy. The reason why prices are negative is because the sum of market participants still has a shortage of storage.

We have a shortage of storage because the amount of energy our grid uses is on a behemoth scale, barely comprehensible. Dozens-of-GW-hr pumped hydro stations fill up their storage to the brim on a constant basis.

Energy storage is expensive. Nuclear is expensive. Solar and wind are cheap. If we are going to need energy storage regardless (we will), then why not combine it with the cheapest sources rather than the most expensive?

You can't "just" put 1GW of power into the ground, that energy is conserved and is still going to do something (quite a lot of somethings, in fact)

Just turn on the crypto mining rigs when the price is wrong

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).