Softbank Group’s SB Energy subsidiary is among investors that contributed to a successful US$30 million Series C funding round for ESS Inc, a US-headquartered manufacturer of iron flow batteries that use a proprietary saltwater electrolyte.

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Enphase CEO Paul Nahi has said that the “unique” modularity of the company’s battery solution could be “incredibly valuable” to help it to meet the needs of customers in regions including Australia, where there is a “real economic case” for energy storage.