Right now the only alternative to Concentrated Solar Power (CSP) technology is PV with battery storage, which is not very feasible for large-scale storage.
Companies and engineers worldwide are pursuing grid-scale energy storage technology that would allow distributed renewable energy sources to easily and efficiently feed electricity into centralized power grids. Once economically commercialized, such technology would find a gargantuan market. And a US-based company will jump ahead of the competition next year with its molten salt storage technique.