Building the Business Case for an Organics Processing Line

A business case for an organics processing line answers four questions in order: whose tons will arrive and under what contract, which site and permit can process them, which technology does that reliably inside your constraints, and whether margin per ton covers the fixed cost with room to spare. Write it as a short investment memo with named variables in place of guesses, and approve the money in stages, each released only when the evidence for the next one is in hand.

Key takeaways

Start from contracted feedstock, not from a technology. The memo’s first page should show tons in writing, by material and by year.
In California, SB 1383 capacity planning counts processing capacity for a city or county only when it is verifiably available, demonstrated by a contract, franchise agreement or other documentation, which makes a signed processing agreement an asset in its own right.
Choose technology by the constraints that bind at your site: neighbors, air rules, land, water and labor. Then price it over its life, not at purchase.
Express the capital and operating model with variables and a break-even test, and show how far each input can move before the case fails.
Name the risks, assign an owner and a mitigation to each, and set decision gates so capital is released in steps.
Leasing or a pilot can buy evidence before the large commitment.

What the memo must answer

Investment committees and lenders ask the same things of any processing project. Use this outline, one section each:

Summary. The decision requested, the capacity, the material, the site, and the one or two conditions that must hold for the case to work.
Market and feedstock. Who generates the material, who collects it, what they do with it today, and what laws are pushing it out of landfills.
Contracts. Signed, in negotiation, and assumed, kept in separate columns.
Site and permits. What you own or control, what is permitted, what needs a new permit or a modification.
Technology. The options considered, why the chosen one fits, where it does not.
Capital and operating model. Variables, base case, break-even, sensitivity.
Financing. Purchase, loan, lease, or a sequence of them.
Risks. A register with owners and mitigations.
Decision gates. What gets approved now and what waits.

Market and feedstock

Describe supply by material class (food scraps, mixed food and yard, yard trimmings, wood, biosolids, manure, digestate) because each carries a different tip fee, process recipe and permit tier. For each class give the sources, the tons available, the share you expect to capture, the season, and the alternative outlets those tons have today. The state laws guide summarizes where diversion rules create supply, and the guide on why haulers are adding organics processing covers the strategic reasons.

A vertically integrated hauler has an extra line: tons it collects today and pays someone else to process. Bringing those in house replaces a cost with a margin and secures an outlet for collection contracts, but only if the processing line can take the tons on day one of the contract.

Small operators show the same logic at a different scale. SG’s profile of Happy Trash Can in Bozeman, Montana describes a company that ran its own food waste collection service, processed the material and sold the product locally, and moved from static piles turned with a skid steer to an SG MOBILE® System with GORE® Cover as volume grew and space and processing time became the limit (profile).

Contracts and verifiable capacity

Contracts carry the case. Show minimum and maximum tons, term, renewal, rate adjustment, contamination limits and termination rights for each. Our guide to organics processing agreements with cities explains those terms.

California adds a reason cities want written commitments. Under SB 1383 capacity planning, each jurisdiction identifies existing organic waste recycling capacity that is verifiably available to it and counties report the results to CalRecycle; capacity counts only when it is demonstrated by a contract, a franchise agreement or other documentation. CalRecycle states that a facility permit is not an indication of capacity available. As of October 2026, the next county report is due August 1, 2029, covering 2030 through 2039 (CalRecycle capacity planning). Check the current text before relying on it.

Technology choice

Pick the method that meets the constraint that binds hardest at your site, then compare survivors on lifecycle cost.

Situation	Method that often fits	Watch for
Clean yard trimmings, rural land, no air rule pressure	Turned windrow	Land per ton, water, turning labor
Food waste near neighbors or under air rules	Covered aerated static pile or enclosed systems	Pad, aeration and cover or building cost
Limited land, growing tonnage	Aerated systems with shorter residence time	Curing and storage space still needed
Tonnage unproven or site temporary	Mobile or leased aerated units	Power supply, pad standard
Energy sales are the goal	Anaerobic digestion, often with composting of digestate	Feedstock purity, gas offtake

Covered positive aeration is SG’s approach. SG describes its system as positive aeration controlled by oxygen and temperature feedback through the SG COMPOST CONTROL™ System, with no building and no biofilter (Cómo funciona). SG rates the SG HEAP® System at 1,000 to 100,000+ tons per year and the SG BUNKER® System at 5,000 to 500,000 tons per year. The system comparison guide sets them side by side, and the methods comparison list covers the alternatives. Covered ASP is not the right purchase for clean green waste on cheap land with no air rule to meet.

Capital and operating model

Keep the model in named variables so reviewers can change an input and see the effect. No industry average belongs in your memo; use quotes and your own data.

Capital (K): site work and pads, aeration and controls, covers or buildings, water infrastructure, mobile equipment, preprocessing, power, soft costs (engineering, permitting, legal), and contingency. Renewals (R): covers, media, blowers, probes, mobile equipment, pad resurfacing, by expected service life. Fixed cost per year (F): debt service or lease payments, land, core staff, permits, monitoring, insurance. Margin per ton (m): tip fee plus product revenue per ton received, minus variable cost per ton and residual disposal per ton.

The core tests, all in plain text:

Break-even tonnage Q* = (F – O) / m, where O is income that does not depend on tons
Break-even utilization U = Q / C, where C is practical capacity
Contract cover = contracted tons / Q*
Annual cash available after fixed cost = (Q x m) + O – F, built year by year with ramp-up and renewals

For the time value of money, discount each year’s cash at the rate your finance team sets and compare against the capital outlay. The tip fee and break-even guide works through the formulas and a sensitivity table, and the lifecycle cost guide lists the drivers behind K, R and F.

Financing: lease, buy or both

Leasing fits when tons are unproven, the site is interim, or capital is committed elsewhere. Buying fits a permitted long-term site with contracted feedstock. SG’s leasing program covers the SG MOBILE System; SG states that leasing includes delivery, setup, system training and ongoing technical assistance, and that leased users can add units, move systems or transition to a permanent SG BUNKER System. The lease vs buy guide compares the paths. Pads, utilities and permits stay with the site either way.

Risk register

Risk	Early sign	Typical mitigation	Owner
Tons do not arrive	Contracts unsigned at design freeze	Put-or-pay or minimum tonnage terms; phase capacity	Commercial lead
Contamination above plan	Load rejections, high screen overs	Inspection and surcharge terms; preprocessing	Operations
Permit delayed or conditioned	Agency comments on emissions or water	Pilot data; early agency meetings	Permitting lead
Neighbor complaints	Calls during startup	Emission control at the pile; complaint log and response	Site manager
Product does not sell	Stockpile growth	Named buyers before startup; quality testing	Sales
Cost overrun	Bids above estimate	Contingency; phased build	Project manager
Change in law or rates	New rule or index change	Change-in-law and rate adjustment clauses	Legal and finance

The permit compliance guide covers what puts a permit at risk once operating.

Decision gates

Release money in steps. Each gate has a test and a deliverable.

Gate 0, screen. Feedstock map and alternatives; margin per ton positive for each material class on stated assumptions. Spend: staff time.
Gate 1, feasibility. Site options, permit path, technology shortlist, base-case model with sensitivity. SG’s project initiation page lists feasibility studies, site selection, financial evaluation, technical evaluation, environmental compliance, grant support and RFP assistance among its early services.
Gate 2, evidence. Pilot on your own feedstock to measure residence time, yield, residuals and emissions. Mid Valley Disposal in Kerman, California ran a demonstration project with SG before its full-scale SG BUNKER System; SG’s profile quotes the company saying it had no composting experience and that the demonstration helped its expansion design (profile).
Gate 3, commitment. Contract cover at or above the level your committee sets, permit applications filed, financing terms agreed, final design.
Gate 4, build and start. Construction, commissioning and operator training, with a ramp-up plan that matches contracted deliveries.

FAQ

What goes in an investment memo for a compost facility?

A summary of the decision, the feedstock and contract position, the site and permit path, the technology choice and why, a capital and operating model in named variables with a break-even and sensitivity test, financing options, a risk register and the decision gates. Keep signed, negotiating and assumed tonnage in separate columns so reviewers can see what the case rests on.

How much tonnage should be under contract before building?

Enough that break-even tonnage is covered by signed agreements, or by a documented and reliable spot market, through the slowest season. Many owners phase the build so the first phase matches contracted tons and later phases follow new contracts. The right level is a decision for your investment committee and lender, not a fixed rule.

Does a permit prove capacity to a California city?

No. CalRecycle’s capacity planning page says a facility permit is not an indication of capacity available. Capacity counts for a jurisdiction when it is verifiably available, demonstrated by a contract, franchise agreement or other documentation. A processing agreement with defined tonnage is therefore what a city can rely on.

Should a hauler pilot before building a full line?

A pilot answers questions no model can: how your feedstock behaves, how long it takes to stabilize, how much is screened out, and what regulators and neighbors see. It also gives lenders and permit agencies measured data. A pilot is less useful when the feedstock and method are already well known at a comparable site you operate.

When should the case be rejected?

When margin per ton is negative or thin for the main material, when break-even needs near full utilization every month, when contracted tons cannot be secured in time, or when the site cannot be permitted for the material you need to accept. Rejecting or redesigning at an early gate costs far less than discovering it after construction.

Next step

Bring your feedstock map, contract position and site to SG through the contact page to discuss system sizing and a phased layout. If key inputs are still assumptions, ask about pilots and demos first.

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