Overcapacity concerns for AD?

I see via @ediewaste that there have been a few concerns about the state of the AD market voiced at the recent ADBA conference.

Basically this looks to me like an incumbent saying: look guys, this is a lot more difficult than you think; be careful as we don't want a situation where there are too many plants chasing too little feedstock (i.e. overcapacity). Overcapacity is of course an issue which tends to be associated in the trade press with efw (the recent Eunomia report being a key element stoking these concerns).

I suspect we're more likely to end up with overcapacity for a technology like AD where the plants are relatively smaller and less capital intensive to deliver than a large-scale residual waste plant. They are therefore less reliant on long-term debt funding which means operators may have greater flexibility to take a punt on a project without being constrained by having to satisfy risk-averse lenders.

AD is a technology which has explicit government backing and which enjoys some of the largest amounts of support under the Renewables Obligation. If operators can't get it to work under these circumstances then there really is something wrong.