A short list of states now run a program that scores fuel by a carbon rating, then pays you when you sell the fuel it rewards and charges you when you sell the fuel it does not. California started it. Oregon, Washington, and now New Mexico have their own versions. If you sell or move fuel into one of those states, this changes your cost, your paperwork, and in some cases your income. If you sell nowhere near them yet, the model keeps spreading, so it is worth understanding before it reaches you.
What a Low Carbon Fuel Standard actually is
A Low Carbon Fuel Standard, or LCFS, is a state rule that sets a yearly limit on the carbon in transportation fuel and tightens that limit every year. It does not ban any fuel. Instead it sets a target and lets the market sort out who hits it. California runs the original LCFS. Oregon and Washington run near-identical programs they call Clean Fuels Programs. New Mexico is the fourth state in, and the first one outside the West Coast. Its Clean Transportation Fuel Standard went live on April 1, 2026, with a goal of cutting fuel carbon at least 20 percent below 2018 levels by 2030. Several more states have studied the idea, so treat this as a pattern that grows, not a California oddity.
Carbon intensity: the score everything hangs on
Every fuel in these programs gets a number called its carbon intensity, or CI. The CI score measures the greenhouse gas a fuel causes across its whole life, from growing or drilling the raw material, through making and moving it, to burning it in an engine. It is figured per unit of energy, so gasoline, diesel, electricity, and renewable diesel all land on one scale you can compare. A lower number means less carbon counted against it. The state sets a target CI for the year, and every fuel is judged against that line. Two truckloads of the same fuel can carry different scores, because the score depends on how and where that batch was made, which goes beyond what kind of fuel it is.
Credits and deficits, and who generates which
Here is the engine of the whole thing. A fuel that scores below the year's target earns credits. A fuel that scores above the target runs up deficits. Plain gasoline and ordinary diesel sit on the deficit side by design, and the target falls each year, so they owe a little more every year. Lower-carbon fuels like renewable diesel, biodiesel, renewable natural gas, and the electricity that charges an electric truck sit on the credit side. The company responsible under the program has to hold enough credits to cover its deficits. Credits can be bought and sold, which puts a real dollar price on the lower-carbon fuel. When a low-carbon load earns credits worth selling, that credit value can be the difference between the fuel penciling out and not.
Who is the regulated party, and where you fit
Every program names a regulated party, the company it holds responsible for the rules. Rather than chase every truck and station, the program points at whoever first brings a fuel into the state market, usually the producer or the importer, and hangs the obligation on them. That party has to register, report its gallons, track the carbon intensity of what it sells, and hold credits to cover its deficits. So the first question to settle in an LCFS state is simple. Are you the one importing or producing the fuel, or are you buying it from someone upstream who already carries that role?
If the obligation lands on you, you have reporting and credit duties of your own, and you should treat them like the fuel tax: real money moving on a schedule. If you buy from a supplier who already carries the obligation, the program still reaches you, just through the price. The cost of their deficits, or the value of their credits, gets baked into the number you pay at the rack. Either way it touches your cost of goods, so it belongs on your radar.
The opportunity hiding inside the cost
It is easy to read all this as one more cost, and for high-carbon fuel it is. The flip side is the part worth your attention. Selling lower-CI fuel in these states can earn credits that add income on top of the gallon you already sold. Renewable diesel and biodiesel are the obvious ones for most marketers, since renewable diesel drops into the same tanks and trucks as regular diesel with no special handling. Renewable natural gas and electricity for vehicle charging generate credits too. The reason renewable diesel has flooded into California and Oregon is exactly this: the credit value pulls it in. So in an LCFS state, carrying the right low-carbon product is a way to earn, and the credit price becomes one more number you watch the way you watch the rack.
How this sits next to the federal RFS and RINs
Do not confuse these state programs with the federal one. They run side by side and they are separate. The federal Renewable Fuel Standard, or RFS, works through credits called RINs, and it applies everywhere in the country. An LCFS program is a state rule, scored on carbon intensity, that applies only inside that state. A gallon of renewable diesel sold in California can be touched by both at once: it can carry a RIN under the federal RFS and earn an LCFS credit under California's program. The two do not cancel each other out, and neither one replaces the other. Our piece on RINs and the Renewable Fuel Standard walks through that federal side in full, and it is worth reading alongside this so you keep the two straight.
The record-keeping, and what it means for the books
The compliance in these programs lives or dies on paperwork, and the paperwork is about where the fuel came from. The carbon intensity of a load is decided by its production path, so the documents proving how and where the fuel was made can be worth as much as the fuel. If you carry low-carbon product, you need volumes by fuel type, the CI score or pathway behind each batch, and the credit transactions, all of it clean enough to report and to defend if the state asks. If you are the regulated party, you file on the program's schedule, the same way you file the fuel tax. If you are buying from upstream, you still want the documents that prove what you carried, so a credit you are owed does not slip away for lack of a record.
Strip away the acronyms and this lands in two places on your books. On the cost side, high-carbon fuel in an LCFS state carries a compliance cost, whether you pay it directly as the regulated party or absorb it in a higher rack price. On the income side, low-carbon fuel can throw off credits that are real money, tracked, valued, and sometimes sold. Both belong in your accounting next to gallons, freight, and fuel tax, not in a spreadsheet off to the side that someone reconciles once a quarter and hopes is right. The operators who handle this well are the ones who put the credits, the deficits, and the carbon-intensity records in the same system that already runs the rest of the gallon. Then it is one more thing the books tell you the truth about, instead of one more thing you guess at.