A new clean fuel standard opens another credit market that rewards low-carbon feedstocks — the lane where used cooking oil lives.
Hawaii Gov. Josh Green signed a clean fuel standard into law on July 14, making his state the fifth in the nation to build a credit market that pays a premium for low-carbon fuels — the exact category used cooking oil (UCO) helps supply.
Senate Bill 2999 directs the Hawaii Department of Transportation to cut the carbon intensity (CI) of the state's transportation fuels — a measure of lifecycle emissions per unit of energy — at least 50% below 2019 levels by 2045, with an interim target of 10% by 2035.
That puts Hawaii alongside California, Oregon, Washington, and New Mexico as the only states running programs like it.
Here's why a standard in a small island market matters to a hauler on the mainland.
These programs score every fuel on its carbon intensity, then hand out credits to the cleanest ones. Fuels made from waste feedstocks like UCO carry some of the lowest CI scores on the board — which means they generate the most credits per gallon. It's the same mechanism that made California's LCFS a magnet for grease.
More credit markets, more buyers bidding for the same barrels.
That's the mechanism. The catch is the clock.
HDOT doesn't have to adopt program rules until Jan. 1, 2028, and the standard won't take effect until Jan. 1, 2029. Hawaii is also a geographically isolated, import-dependent fuel market — its physical pull on mainland UCO will be modest.
"It marks a pivotal moment in Hawaii's commitment to a sustainable future," said Cory-Ann Wind, director of state regulatory affairs at Clean Fuels Alliance America and a Hawaii native, naming biodiesel, renewable diesel, and SAF as fuels that will help the state hit its targets.
For collectors and processors, the volume out of Honolulu isn't the story. The direction of travel is.
Every new state that adopts a low-carbon fuel program adds another structural buyer for a feedstock that's already in tight supply — and each one prices UCO a little more on its carbon score than its raw gallons. Five states now compete on that basis.
Overall, the map of state clean-fuel credit markets is filling in one legislature at a time, and low-CI feedstock is the currency each one runs on.
For haulers, collectors, and traders, Hawaii's law changes nothing this quarter. But it's one more marker in the trend quietly rewriting UCO's value. Watch which state moves next, and whether the bigger ones tighten their CI targets.
