RINSTAR Blog

RIN Compliance Made Simple: Understanding D-Codes and Fuel Categories in the RFS

Confused by D-codes and fuel categories under the Renewable Fuel Standard (RFS)? This guide breaks down how RINs are categorized by fuel type, production method, and greenhouse gas reduction thresholds. Learn how D3 through D7 RINs interact with the RFS’s nested compliance structure and how RINSTAR can simplify reporting and compliance for your renewable fuel business.

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Lawmakers, EPA Push Forward on RFS and Tax Credit Extensions

Lawmakers and the EPA are taking major steps to strengthen the Renewable Fuel Standard (RFS), from setting ambitious Renewable Volume Obligations (RVOs) for 2026 and beyond to extending critical tax credits that support the renewable fuels industry. In this update, RINSTAR breaks down the latest regulatory and legislative actions that stakeholders should know to stay compliant and informed.

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Understanding Renewable Volume Obligations (RVOs)

At the heart of the U.S. Renewable Fuel Standard (RFS), Renewable Volume Obligations (RVOs) determine how much renewable fuel refiners and importers must blend annually. This article walks you through the evolution of RVOs—from RFS1 to RFS2—explains how the EPA sets these annual percentage standards, breaks down each D-code category (D3–D6), and shows how individual RVOs are calculated, including deficit carryover and RIN tracking tools.

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