NFI's EV Bus production is so large that I doubt Electrovaya could meet the initial demand.  As time progresses ELVA can increase production capacity  as needed.  Larger manufacturers always have two suppliers in case calamity strikes one they can limp long with the other.  VMC motors is an example where Electrovaya is the second supplier although that have not yet started suppling VMC.  I think the are waiting on Jamestown production so they can have a US made battery??