I’ve had a few e-mails from readers wondering what the heck is going on at ZENN Motor Co., which apparently didn’t — contrary to its own expectations — receive its first commercial EESU demonstration unit from EEStor before the end of 2009.  The company has yet to put out a press release on this (as a publicly traded company, some say it should), so here’s the response I got directly from the company’s media-relations department:

The last remaining contractual milestone between ZMC and EEStor is the third party verification of delivery of a full production quality EESU that meets certain specifications outlined in the Technology Agreement between the companies. Achievement of this milestone will be announced by ZENN Motor Company via news release to all stakeholders.

Any interim sharing of information or technology between ZMC and EEStor is confidential in nature and will not be publicly disclosed. Any announcements related to EEStor’s technology that fall outside of the contractual milestone described above are strictly within EEStor’s purview to release to the public. ZMC will only comment on EEStor’s progress once the information is made available in the public domain by EEStor.

ZMC remains focused on the development of its ZENNergy drivetrain solutions in anticipation of the successful commercialization of EEStor’s technology. ZMC continues to work with EEStor on a regular basis.

So, that’s where things stand… As Chaucer wrote more than 600 years ago, “Patience is a high virtue.” Or not. I doubt you’ll hear ZENN making any more predictions of when it will receive its first EESU. Still, given the expectations it has built up over the last two years and given that ZENN’s future rests almost entirely on the success of EEStor, the company should probably be more communicative with shareholders. At the same, shareholders need to realize that with those updates ZENN isn’t making hard promises, but merely shedding light on a schedule that — as we’ve certainly learned — is difficult to nail down.

UPDATE: StephenB makes a good point in COMMENTS by parsing ZENN’s statement. It may have received an EESU, but hasn’t announced anything yet until “third party verification of delivery of a full production quality EESU that meets certain specifications.” So, technically, ZENN may — or may not — be on track. We just don’t know.