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Where BSF Loses (a case with numbers)
Recently I showed a case where BSF beats composting, biogas and the landfill — and ends up costing less than nothing to run, per ton.
01 · The other half
The losing side
Here is the half almost no one in this industry writes: where BSF is the wrong answer — and what it takes to move a case back to the right side.
02 · The edge
The hidden edge
That winning case did not win on good numbers alone. Good numbers are only the entry ticket. On top of them it had an edge — something special: free substrate, low-cost energy, low wages, and a real local buyer for the larvae and frass. Take any one away and the case flips. Winning needs all of it aligned at once; losing needs only one piece missing. So don't let a clean metric fool you — a good result almost always hides a special advantage doing the heavy lifting.
03 · The number
One number decides
The same single number decides it: what it costs to handle one ton of biowaste, after whatever you monetise from the output, against what the producer pays to get rid of that ton today. At or below their cost, you build. Above it, you walk.
04 · The gaps
Where a case slips
Here is where a case slips to the wrong side — and the lever that can pull it back:
- No local buyer for the output. The larvae and frass are the lever that pulls the cost down; with no one to buy them, it is gone. The buyer can sit further away, but only if your price expectation drops far enough that the freight still clears. A product with no buyer at a workable price is not revenue — it is inventory.
- High wages. In a developed market, labour can be the majority of the running cost. The fix is to automate more — which works, but only if that extra CAPEX carries low return expectations, or comes as a grant.
- No subsidy where the case needs one. Many cases only close with help in some form: cheap land, cheap energy, a gate fee paid on the incoming waste, or an operating subsidy. Strip it out and the same case stops working.
- A subsidised incumbent. If a biogas or composting plant with its capital already sunk takes the waste at a low gate fee, the bar is artificially low — UK food-waste gate fees fell from about £40 a ton to £13, with some operators paying to take feedstock.
- The wrong rules, or a climate that fights you. Substrate bans, frass not recognised as fertiliser, or extreme cold or heat without cheap energy — any one can sink the best case on paper.
05 · The verdict
An honest answer
So the honest output of an evaluation is rarely a clean yes. It is a number, and the real question behind it: what edge — or what level of subsidy, in some form — would this case need to clear the line?
That is what we built a real-world model to answer. Not lab ratios and best-case spreadsheets, but real disposal costs, real wages, real buyers and real energy prices — so the verdict is pragmatic: build, walk away, or build only with this specific support in place.
06 · The last step
Run the number
Run the number before you build. It is far cheaper to fail on a spreadsheet than on a site.
What would it cost you to get rid of a ton of organic waste today — and what edge would BSF need to beat it?
Keep exploring
Related topics and pages
- Where BSF Wins (a case with numbers) — the winning case this post is the other half of
- BSF Business Case Service: an honest go / no-go — the service that stress-tests a case's per-ton number
- Four Ways to Handle Biowaste — Where Each One Actually Wins — where biogas, composting and landfill each fit
Read next
- Where BSF Wins (a case with numbers) — the winning case this post is the other half of
- How a BSF case actually pays for itself: 4 levers, the stack, and why one alone never closes — the four revenue levers that stack against the per-ton cost
- Facility Design & BOM (solution explainer) — the next step once a case clears the line
- Use Case #5: Multi-container municipal waste startup — a real build where a contracted waste stream follows the modular path
Next step
Talk the case through
Manna can model a specific case and return the per-ton number, so the verdict is build, walk away, or build only with a named support in place.