-January 8,2020-
The growth of renewables and their declining costs are driving this increase in energy storage, NREL noted. Approximately 18 percent of the electricity generated in the United States is from renewable sources, and that number is expected to continue to increase, NREL said.
According to estimates from NREL’s Renewable Electricity Futures Study, the continental United States would need 120 gigawatts of storage if 80 percent of electricity comes from renewable resources. The United States currently has 22 gigawatts of storage from pumped hydropower and another gigawatt from batteries.
“The declining cost of wind and solar and now batteries makes it conceivable to consider 100% renewables,” Paul Denholm, a principal energy analyst at NREL, said.
NREL noted that storage encompasses a wide range of technologies, including batteries, pumped hydropower, ice, chilled water, heat, and electrochemical, with other technologies currently under development.
“There’s a misunderstanding,” Adarsh Nagarajan, the group manager for Power System Design and Planning at NREL, said. “Storage is often looked upon as electrochemical storage or battery storage. Storage is beyond batteries. It’s beyond electrochemical. It’s much broader.”
“There is no one winner,” Nagarajan said. “All of them should work together in order to achieve a certain goal, which is grid stability and resilience and to fulfill customer needs.”