So let me get this straight
You put all of your PC desktop images into large servers held in the data centre.
You then use something on each desktop to run a virtual session to those large servers.
What are those devices on the desktop? Oh yes, PC's.
I know that the devices on the desktop will be cheap/low power PC's, but bearing in mind how powerful even a basic PC is nowadays, where is the saving?
If you were to sell it to me as an administrative saving, or a deployment cost saving, or even as a data de-duplication saving, then I may be interested. But as a power saving?
Of course, if the desktop devices were diskless, low power consumption (ARM type power) real thin clients then this may make sense, but we've been here before, and commodity PC's always undercut specialist net devices (where are Tektronix, Oracle, NCD et. al. with their thin-clients, Netstations and X-terminals now. Oh yes, out of that business). The cost ends up being the screen, keyboard and I/O devices, not the PC itself.
Where savings are being made at the moment is that older low-power PC's are being used as the access devices, but this is unlikely to give you a power saving, and is not going to be a model for phase 2 and later roll-outs!