"The International Energy Agency (IEA) . . . reckons that the global installed capacity of battery storage will need to rise from less than 200 gigawatts (GW) last year to more than a terawatt (TW) by the end of the decade, and nearly 5TW by 2050 . . . . Fortunately, though, the business of storing energy on the grid is at last being turbocharged. . . . A plunge in the price of lithium batteries is fuelling their adoption on the grid. . . . Sodium-ion batteries are one promising alternative {and incumbents} are rushing to develop the technology for the grid."