USDA Releases Updated Carbon Intensity Calculator for Biofuel Feedstocks
New tool factors in manure and finer crop-level detail, writes Farm CPA Report’s Paul Neiffer
USDA has issued a user guide for its Feedstock Carbon Intensity Calculator (FD-CIC), the Excel-based tool tied to the agency’s final rule on regenerative agricultural biofuel feedstocks under 7 CFR Part 2100 (link). According to Paul Neiffer, CPA, writing in his Farm CPA Report on Substack, the calculator produces a carbon intensity (CI) score — grams of CO2-equivalent per bushel — for corn, soybeans, sorghum or spring canola. That score determines whether a grower’s grain qualifies as a reduced-CI feedstock, a designation that biofuel and clean-fuel buyers are increasingly paying up for. Neiffer’s bottom line: the lower the score, the stronger a farmer’s position in that market. Link.
Getting the Spreadsheet Running
Neiffer notes that the FD-CIC is macro-enabled, so users need to save it locally, open it and click “Enable Content.” He recommends a quick test: changing cell C5 to “2” on the Crop Inputs tab should cause a second input column to appear. If it doesn’t, macros will need to be turned on through Excel’s Trust Center before the tool will run. All of the modeling, he adds, happens on that single Crop Inputs tab.
Entering Crop and Management Data
Per Neiffer, the calculator runs one crop at a time, broken into “management units” — a field or group of fields under the same use and management — with each unit assigned its own column. Required entries, shaded pale yellow, include state, county, acres, actual average yield, expected yield and total synthetic nitrogen applied per acre. He cautions that growers carrying crop insurance should use the yield that established their coverage as the expected yield; those without coverage should use the transitional yield or the ARC county benchmark yield published by RMA or FSA.
Practices That Move the Score
From there, Neiffer explains, farmers layer in the practices that lower CI: cover crops, with or without grazing; reduced-till or no-till; the share of synthetic nitrogen treated with a nitrification inhibitor; and manure application. Manure, he says, takes the most care — growers must enter the manure type, the rate applied per acre and the nitrogen content drawn from an actual manure test. Appendix 1 of the USDA guide walks through how to read that test, including converting dry-weight results to an as-sampled basis and the separate unit conversions for solid versus liquid manure.
Running the Numbers
Neiffer ran the calculator against his own field in Buchanan County, Iowa, first under conventional practices and then again after layering in no-till, cover crops and a nitrogen inhibitor. The two charts below, from his Farm CPA Report post, show the comparison.
As Neiffer points out, the regenerative scenario — adding no-till, cover crops and a nitrogen inhibitor — produced a meaningful drop in the CI score compared with the conventional baseline.
The Bottom Line
Neiffer’s takeaway is that farmers will need to weigh the added cost of those practices against whatever premium a processor might pay for a lower-CI bushel. He adds an important caveat: biofuel producers are still waiting on USDA’s final guidance for how to apply the new tool, which may not arrive until later this year. He says he will continue tracking the rollout.
