HydroPhi Technologies Group Inc. (fka HPTG)

[undtrdr]

And I would add the best part of Hydrophi's patented tech is the system can be retrofit to existing fleets! Far less expensive then brand new trucks and buses particularly for cash strapped governments with a mandate to reduce emissions worldwide.
Also read today Poland is not only looking at these for buses but their garbage trucks as well.
I'd say you are on the money easyme this is the tip of the ice burg.