Beyond batteries: The diverse technologies vying for the bulk storage market

By Herman K. Trabish, Utility Dive

All the talk in the electric utility industry these days seems to be about battery storage, but there are other ways to save generated electricity for later.

With more demanding state renewable portfolio standards, the finalization of the EPA’s Clean Power Plan and utilities increasingly turning to renewables as a least-cost option, grid operators are likely to need more and bigger storage options by the mid-2020s, if not before.

“The excitement in the market now is around the policies we have in place, which very specifically exclude big pumped hydro applications,” explained California Energy Storage Alliance (CESA) Sr. Advisor Mark Higgins, the VP/COO at Strategen Consulting. “Those policies were designed to create a diversity of technologies. Bulk storage would work against that.”

But, Higgins said, by around 2024, when California gets to about 40% renewables, there will be a real need to shift excess renewable energy supplies from the middle of the day to the late afternoon and evening. “That will require storage resources that can handle big amounts of energy over long periods of time.” Higgins expects California regulators to again take the lead, as they did with the AB 2514 policy now driving battery technology growth, and put in place incentives for long duration storage technologies. Following is an overview of some of the diverse technologies vying for the bulk storage market…

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