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(I work at Form fyi)

Am I correct that the company has improved the achievable C-rate since the May 2020 announcement of a 1MW/150MWh demonstration project?

Are there any publicly available documents about the chemistry, or how the product compares with e.g. the ESS Inc. iron flow battery?

This is what we're saying publicly about the chemistry: https://formenergy.com/technology/battery-technology/

Not sure where that article got the 300MW number, the GRE project is on track for the original size.