Nice calculation! But you have to continue:
Where do all these 7B kWh end? 90% of it is not used for the transport of data. They just produce heat, which has to be cooled away. And this usualy causes the same cost of the wasted energy itself. So we are already at 1 B USD per annum.
So what is the value of this POET saving 1B USD for the US datacenters only? at the moment 167 M USD ??? Crazy.