US funding body ARPA-E funds research on energy storage lasting for days

New program funnels $28 million to flow batteries, thermal and chemical energy storage, and other long-duration technologies.

Long-duration energy storage — batteries or other technologies that can store energy for at least four hours of continuous operation, or possibly even longer — accounts for a minority of the grid-scale energy storage deployed today.

There are many reasons for this, including the cheapness and relative reliability of lithium-ion batteries for short-duration applications. As well as the, shall we say, less than stellar record of long-duration battery startups that have gone bankrupt or failed to deliver on their promises.  Read more.

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