Explainers

Policy

Written from EPA, CARB, the IRS, and state agencies. A figure appears here only when the sentence links the page it came from.

• Renewable Fuel Standard

  How RINs, the 2026 and 2027 biomass-based diesel standards, equivalence values, and small-refinery exemptions fit together.

• California Low Carbon Fuel Standard

  Benchmarks, credits, carbon intensity, and the crop-based diesel limit in the rule that took effect in July 2025.

• Section 45Z clean fuel production credit

  Who can claim the federal production credit, how the emissions rate works, and which dollar amounts are in force.

• Oregon CFP and Washington CFS

  The carbon-intensity schedules Oregon and Washington publish for their clean-fuel programs.