Information and speculation.. It is about 'enough volume to produce a profit:
This is from BioExx at the end of Feb. 2013
When Sask is running, it is running in continuous mode – meaning the feedstock is delivered into the system at start-up and the plant runs continuously through the process until that feedstock is processed through the spray dryer.
"PRESENTLY, WHEN IN PRODUCTION-MODE, WE RUN THE PLANT 3 DAYS A WEEK, WITH A DAY OF THAT BEING CLEANING AND MAINTENANCE ON EACH END, THEREFORE IT RUNS CONTINUOUSLY FOR TWO DAYS – DEPENDING ON HOW LARGE THE RUN IS THAT WE ARE DOING. WE HAVE RUN LONGER AND WE CAN RUN LONGER (AS MUCH AS 7/24, BEING OFFLINE ONLY FOR CLEANING CYCLES AS PER FOOD GRADE SPECS), THE ISSUE IS NOT RUNNING CONTINUOUSLY, THE ISSUE IS DOING IT AT LARGER VOLUMES AS REQUIRED TO GENERATE A PROFIT – WHICH WAS THE ESSENCE OF THE WORK THAT WAS DONE BY GEA.
WE HAVE PROVEN CONTINUOUS PROCESSING WITH PREDICTABLE QUALITY, GEA WAS BROUGHT IN TO PROVIDE A ROADMAP TO DOING THAT AT HIGHER VOLUMES – IMPLEMENTATION OF THE GEA RECOMMENDATIONS IS A PRECONDITION TO THAT SCALE-UP.