$ cat ./records/breakthrough-energy-ventures-co-leads-30-million-series-c-for-ess-2019.txt
Breakthrough Energy Ventures Co-Leads $30 Million Series C for ESS Inc. Iron Flow Battery for Long-Duration Grid Storage
[RECORD.TXT] · cat --full
Breakthrough Energy Ventures and SoftBank's SB Energy co-led a $30 million Series C for ESS Inc., an Oregon-based developer of long-duration iron flow batteries using only iron, salt, and water as electrolyte — abundant, non-toxic, and recyclable materials. The funding enabled ESS to automate its second-generation battery manufacturing targeting grid applications requiring 4–12 hours of storage duration where lithium-ion is uneconomical. ESS subsequently listed on the NYSE in October 2021.
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