Study unveils secrets of long-duration storage

About 30% of energy storage procurement decision makers interviewed for the ESS study Beyond Four Hours said long-duration storage was “very important” for their business already. Image: ESS.

About 30% of storage procurement decision makers interviewed for the ESS study Beyond Four Hours said long-duration storage was “very important” for their business already. Image: ESS.

By Jason Deign

More than half of upcoming energy storage projects could require assets with a discharge duration of around four hours or more, according to new research.

About 30% of energy storage procurement decision makers interviewed for the ESS study Beyond Four Hours said long-duration storage was “very important” for their business already.

Another 30% said they were currently considering long-duration storage projects, 20% said it would be important in future and 10% considered it as part of a broader portfolio. Only 10% said it was not applicable to their business.

The research, carried out among energy storage procurers and project developers in association with Energy Storage Report, revealed a wide range of definitions for what constitutes a ‘long-duration’ asset.

But six out of 10 respondents claimed a requirement of more than four hours, which is generally considered beyond the cost-effective range of lithium-ion batteries commonly used for shorter-duration electricity storage. 
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The utility veteran’s choice of energy storage

Utility veteran Michael Niggli's decision to join the board of flow battery maker ESS is a vote of confidence for long-duration storage. Pic: ESS.

Utility veteran Michael Niggli’s decision to join the board of flow battery maker ESS is a vote of confidence for long-duration storage. Pic: ESS.

By Jason Deign

An executive appointment last month has signalled increasing confidence in the ability of flow batteries to tap into the promising market for long-duration energy storage.

Michael R Niggli, the former president and chief operating officer of San Diego Gas & Electric (SDG&E), joined the board of all-iron flow battery maker ESS Inc. amid a growing focus on storage applications exceeding four hours of duration.

“As the renewable energy trend continues to reach penetration levels of 25% to 35% and potentially well beyond, it’s evident that the impact on local distribution networks, and the entire grid, is going to be pretty profound,” Niggli told Energy Storage Report.

“That suggests there is a growing need for need for medium and long-duration storage.”

Electrical energy storage’s current focus on short-duration applications, such as frequency response, is partly a consequence of the still relatively low penetration of renewables in most grids and a need for ancillary services. 
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