California, Hawaii, Australia. In hawaii they canceled a proposed inter-island power connector because batteries + solar were just cheaper. Pumped storage is

California, Hawaii, Australia. In hawaii they canceled a proposed inter-island power connector because batteries + solar were just cheaper. Pumped storage is generally a lot more economic and can store a lot more than batteries but it cant be built quite as quickly & is somewhat geographically dependent. It takes 4-5 years to deploy rather than months.