A trio of announcements in the long-duration energy storage (LDES) sector, from RedoxBlox, Eos Energy Enterprises and ESS Inc.

Updated 29 September 2023: Following publication of this story, ESS Inc responded to a couple of Energy-Storage.news’ enquiries.

ESS Inc ended 2022 with nearly 800MWh of annual production capacity for its iron flow battery, although had a relatively poor last financial quarter with just US$15,000 in revenue.

Malaysia-based Reservoir Link has signed a memorandum of understanding (MOU) with an unnamed US-based ‘Iron Flow Long Duration Energy Storage provider’, while ESS Inc tells Energy-Storage.news it is ‘actively exploring’ opportunities in Reservoir Link’s markets.

VoltStorage, a developer and maker of energy storage systems using vanadium flow batteries, has raised €24 million (US$24.3 million) in a Series C.

Lithium-ion will struggle to compete at long durations and its price declines cannot continue forever, said Alan Greenshields, Director EMEA for iron electrolyte flow battery supplier ESS Inc, in a rebuttal to an earlier Energy-storage.news article on the topic.

Long duration energy storage (LDES) technologies may have a difficult time competing with lithium-ion over the next decade as the latter’s cost-competitiveness at longer durations increases, possibly even to 24 hours, according to Haresh Kamath, Electric Power Research Institute (EPRI).

NYSE-listed iron flow battery group ESS Inc is expanding into Europe with its first deployments on the continent later this year.

ron flow battery provider ESS Inc has revealed a US$477 million net loss in 2021, in its first full-year results since becoming a publicly-traded company on the New York Stock Exchange (NYSE). 

ESS Inc, among several companies looking to commercialise a flow battery energy storage technology, has netted US$13 million in a Series B funding round from investors that include global chemical company BASF.