The role of long-duration energy storage in deep decarbonization: policy considerations

Achieving deep decarbonization in the US will require days, and potentially weeks, of energy storage to be available – but today’s technologies only provide hours of capacity. Evolving technologies, like hydrogen, will be needed for long duration storage that can extend to weeks of capacity. While the needs of our future grid are still uncertain, policymakers can and should support the evolution of long-duration, clean energy storage by encouraging technology innovation and enabling financing and procurement models that align with long-duration storage.