How about a mixture of batteries (redox-flow, LiFePo, NaFePO, iron-air, Li-Ion), thermal storage (porous volcanic stone, heated water, liquid salt), mechanical storage (giant rotating masses, compressed air), pumped hydroelectrical storage, power-to-gas or power to liquid(hydrogen or ammonia) and creating interconnected power grids?

That should do. Would not create a single point of failure and prevent having everything in the hands of probably a single entity.