Having re-read the economy of Assembly, I see what you mean @alberto with overlap being significant. As I see it, we could address that constructively.
First, we can allow for some overlap, and perhaps even move the origin of some of the decentralized and cooperative practices to Avantgrid, appropriated and repackaged by the Assembly.
What we could also do is to ask ourselves: Under which cultural circumstances could you imagine a system where a truly cyclical economy was possible? How would the citizens of Assembly have to behave for this ledger of materials and energy to actually work? One thing that comes to mind is to make use of the religious beginnings of Avantgrid and introduce a very strong social control mechanism that makes it taboo to not comply. If avoiding to exhaust resources is almost a religious conviction, what happens?
In this I am inspired by things like the practice of Ramadan in Muslim nations which has a huge effect on productivity, but also by secular collectivist cultures that allow for things like the Swedish labor market model. If the people of Avantgrid were extremely conditioned to keep conscious of all energy and material consumption - what sort of economic system could that enable?
I’m imagining a system where children from a very early age grow up to be conscious of every little “energy transaction” around them. It becomes almost second-nature to calculate the exchanges. Every citizen of Avantgrid is expected to intuitively do this sort of calculation:
“Burning 1 kg of coal yields X joul, only 1/3 of that can be transferred to electrical current given this temperature and the materials used in this particular generator”
More complex transactions are handled by the State Machine, and then the job of each Avantgrid citizen is to be meticulous about recording the details of every significant energy transaction. Thanks to the sophisticated algorithms of the State Machine, it is usually enough to take note of transactions in natural language, like: “Around 10 kg of pinewood grown on the Island of Samla (ID of pinewood harvesting event: 12882) was burned until only ashes remained at 10:22 AM on such as such date”.
A culture of such meticulous note-takers could have the side-effect of producing some excellent scientific aethnographers, with astute observational skills. This could, in turn, be the foundation for Avantgrid being a centre for observational science - but perhaps not as much for engineering, which is a niche taken by the Covenant anyway.
Third, could we imagine a whole new economy rising out of the decision to minimize energy consumption? For example:
Could the State Machine refill your wallet of credits at a pace that was modified negatively by your expenditure of energy?
Could we imagine a whole service arising around conducting energy audits? If your ledger of energy and material consumption can be audited at any point, would that nudge you towards compliance? How would such an audit look - a job for augurs perhaps? “Tell me about that barn, it wasn’t here 10 years ago. How did you build it? Where did the materials come from?”.
Perhaps Avantgrid gains something from not being connected to the Harvest grid? What do the other Distrikts pay for access to the grid? What does Avantgrid stand to gain from staying independent? Perhaps Avantgrid does not have to send any resources to Hygge and Harvest?