Biodiesel Feedstock Collection, Documented Kitchen by Kitchen

Collected fryer oil sits in the yellow grease band, meaning under 15 percent free fatty acid, and the number that matters to a FAME biodiesel plant is whether it clears the roughly 3 to 4 percent line where extra catalyst stops being enough and acid esterification becomes necessary. What determines where a load lands is upstream behavior: how long oil is held at temperature, whether salt and moisture from wet product are in it, and what else made it into the container. Moisture is the expensive half, because it is weight that never converts to biodiesel and it keeps generating more acid while the feedstock waits. We will not publish a guaranteed number here, and you should be skeptical of anyone who does. Spec, sampling, test method and rejection terms are negotiated into the supply agreement, testing happens at the receiving facility on arrival, and the honest promise is that we control grade where it is actually decided, which is at the kitchen.

Federal recordkeeping asks a renewable fuel producer to keep documents showing the amounts by weight of biogenic waste oils, fats and greases purchased, plus the location of the establishments that waste stream was collected from, and to keep those records five years from the date they were created. A California collection manifest already contains both halves. It names the generator and address, states the grease type in writing, records the amount in pounds or gallons, carries signatures from an on-site representative, the driver and the receiving facility, and runs a consecutive number so a gap is obvious. That means the upstream portion of a biodiesel feedstock file is generated at pickup and signed by two parties, rather than assembled later from purchase invoices that only prove a transaction happened. Under the Renewable Fuel Standard, biogenic waste oils, fats and greases run the D4 biomass-based diesel pathway, and D5 when co-processed with petroleum.

It raises the bar on provenance. The credit applies to clean transportation fuel produced domestically and sold between January 1, 2025 and December 31, 2029, and fuel produced after December 31, 2025 must be exclusively derived from feedstocks produced or grown in the United States, Mexico, or Canada. A taxpayer also cannot claim it unless registered as a producer of clean fuel at the time of production, which is not something that can be fixed retroactively. For a plant buying imported or heavily traded feedstock, that turns origin into diligence work. For a plant buying oil collected out of restaurants in Orange County, Los Angeles, San Diego, the Inland Empire, the Bay Area or Tacoma, the origin question answers itself with a street address on a signed document. Confirm the specifics with your own tax counsel, because credit mechanics move faster than any web page does.

Yellow grease is one of the few things leaving a restaurant through the back door that has published price discovery. USDA Market News quotes it weekly in cents per pound by region, with California regions listed separately from the Pacific Northwest, and each quoted on both an FOB basis at the collection point and a delivered basis, because freight is a real share of value on a heavy liquid. Supply agreements index to that published number rather than to a private opinion about fair value. On the kitchen side the service is free: no pickup fee, no container rental, no contract, no minimum volume. That works because the oil has commodity value as biodiesel feedstock and we are paid on that side of the transaction rather than by the restaurant. High-volume kitchens can also qualify for a rebate on the oil itself. It is the same economics that keeps the collection network growing, which is what puts gallons behind a supply commitment.

Because the hard part is not moving liquid, it is holding thousands of small service relationships together well enough that the liquid shows up clean and on time. A single kitchen with four to six fryers produces a 130-gallon container every one to two weeks. Scaling that into biodiesel feedstock means signing kitchens, sizing containers to real output, hitting a cadence so nothing overflows, servicing the container, keeping trap waste and filter pads out of it, and doing all of that while restaurants close, change owners and get pitched by competing collectors. Route density then decides whether a given kitchen is even economical to serve. A spot market purchase skips the work and inherits the consequences: unknown handling, unknown blending, and an origin trail that starts at a broker rather than at an address. The source-level record exists because of the aggregation, and it cannot be bolted on once the feedstock is already in a tank.

It depends which scoreboard you are reading. Under the Renewable Fuel Standard both land in the same D4 biomass-based diesel category, so the RIN code is not the argument. The advantage shows up in carbon accounting, where California compares each fuel to a carbon intensity benchmark that declines annually and pays credits to fuels coming in under it, and in price behavior, since waste feedstock does not track planted acreage or crop export demand. The cost side is real: collected kitchen oil arrives more variable than refined crop oil, and a free fatty acid swing can turn a routine batch of biodiesel into a pretreatment job. That variability is managed at the source or it is not managed at all.

Pickups are performed by CDFA-registered transporters, and every load is delivered to a licensed renderer as the authorized receiving facility. California publishes its licensed inedible kitchen grease transporter list on a public state site, along with a decal lookup, so your procurement or diligence team can verify credentials directly instead of taking a vendor PDF at face value. On the paperwork side, manifest retention is a minimum of two years under California regulation for both the transporter and the receiving facility, and we archive two years as company policy because feedstock questions tend to arrive long after the fuel was sold. If your vendor qualification process needs specific documents beyond that, raise it during the supply agreement conversation and we will tell you plainly what exists and what does not.