Actually, I think the dual opti-blend kit has the most...

Actually, I think the dual opti-blend kit has the most potential. Next would be the Mumbai bus trials. Then the rest, including pyrolysis. If the tea estate trial was a success as it was touted to be, and the dual opti-blend kit was proved to be cost-effective, then we should at least have seen some positive indications, if not contracts. The lack of it bothers me a bit, but in India things do take some time as is evident from yesterday's announcement. So, am still hoping.
Mumbai's public buses is a huge network, second only to their trains as a means of public transport. Allied to piped gas, it's a big deal if it clicks.
Piped gas is to at least hundreds of thousands of households, probably nearly a million. Taking into account gas cylinders, which many still use, definitely in the millions. So that could be a big earner as well. But while the bus trial is limited to the Mumbai regional area, the opti-blend has India-wide appeal. This in a country that has yet to have reliable power supply.