I have been thinking about the potential "upstream" offering that Peter keeps referencing but is prevented from disclosing for IP concerns which is understandable.

With that being said, no constriants on my speculating as to what this may be.  Aluminum starts out as Bauxite which is surface mined.  From there, it is processed into a fine white powder called Alumina.  Prior to becoming Aluminum, Alumina itself is smelted....(note the high heat referenced below....possible Plasma torch use here perhaps?).  This is part of the "upstream" process.

Also, note the company - Rio Tinto...which has been identified as "Client B" by other curious folks.  Now, note the interesting reference to Hyrogen being used below (and Pyr's patent zero GHG emission patent for Methane / Hyrogen conversion.

Could this relate to the upstream offering?  A lot of this lines up to Pyro....and this would be another area where fossil fuel combustion could be replaced with plasma torches early on in the process.

Rio Tinto to study using hydrogen in alumina refining in green push | Reuters

The Australian Renewable Energy Agency (ARENA) said on Wednesday it would provide half the funds for the A$1.2 million ($925,000) study, in which Rio Tinto plans to simulate the calcination process -- which forms alumina at high heat -- at its technology laboratory in Melbourne.