FOIA request for Google hack returns details on electric grid security [2014]

I can't edit the URL, but a more narrative story is here:

http://www.securityweek.com/dhs-mistakenly-releases-840-page...

It details a research project demonstrating the ability to use protective relays in power systems to cause physical damage to those systems. Part of the vulnerability also lies in using low-power control buses (Modbus) and equipment that does not perform sanity checks to assure synchronous operation of the power systems.

Contains a video of what appears to be a diesel generator being controlled by computer and caused to shake violently and spew enough smoke to obscure it from view.