You have probably heard the term RIN thrown around in industry conversations. Maybe a buyer mentioned it. Maybe you saw it in a headline. But if you have never fully understood what a RIN is or why it matters to your business, you are not alone. Most people in the grease collection side of the industry have never had a reason to dig into the details.
That is starting to change. Because the RIN market is one of the biggest reasons your used cooking oil has become so valuable, and the latest data shows that market is growing.
The latest numbers
According to data released by the EPA on April 16, nearly 1.93 billion RINs were generated under the Renewable Fuel Standard in March. That is up 1 percent compared to March 2025. Total RIN generation for the first three months of 2026 reached nearly 4.9 billion.
Those numbers reflect the volume of renewable fuel being produced and entering the U.S. fuel supply. When RIN generation goes up, it means more biofuel is being made. And more biofuel being made means more feedstock, like used cooking oil, is being consumed.
So what exactly is a RIN?
Think of a RIN like a receipt.
When a biodiesel or renewable diesel producer makes a gallon of fuel from something like used cooking oil, the EPA issues a digital credit attached to that gallon. That credit is called a Renewable Identification Number, or RIN. It is proof that a gallon of renewable fuel was produced and entered the fuel supply.
Here is where it gets important. Oil refiners in the U.S. are legally required to blend a certain amount of renewable fuel into the nation's gasoline and diesel supply every year. That requirement is set by the EPA under the Renewable Fuel Standard. If a refiner blends the fuel themselves, they earn RINs. If they do not, they have to buy RINs from someone who did. Either way, the obligation has to be met.
Think of it like a restaurant health inspection. You either pass the inspection yourself or you pay someone else to fix your kitchen so you can pass. The RIN is the proof that the work got done.
Why there are different types of RINs
Not all RINs are created equal. The EPA assigns different categories based on the type of renewable fuel and the feedstock used to produce it. The category that matters most to UCO collectors is called a D4 RIN.
D4 RINs are generated from biomass-based diesel, which includes biodiesel and renewable diesel. These are the fuels made from feedstocks like used cooking oil, animal fats, and soybean oil. D4 RINs are among the most valuable RIN categories because they satisfy multiple layers of the blending obligation at once.
When a producer turns your used cooking oil into biodiesel or renewable diesel, they generate D4 RINs. Those RINs have real dollar value. They can be sold on the open market to refiners who need them for compliance. That credit value is a major part of why producers are willing to pay for your UCO in the first place.
Why RINs make your grease more valuable
Here is the simplest way to think about it. The price a biodiesel producer pays you for used cooking oil is not just based on the value of the fuel they make from it. It is also based on the value of the RINs they generate from it.
Picture it like this. You sell a truckload of UCO to a biodiesel plant. That plant turns it into B100 biodiesel. For every gallon produced, the plant gets a D4 RIN. The plant then sells that RIN to a refiner who needs it for compliance. The revenue from that RIN sale is part of how the plant can afford to pay you for the grease.
If RIN prices are high, producers can pay more for feedstock. If RIN generation is rising, it means more fuel is being made and more feedstock is being consumed. Both of those dynamics benefit collectors.
What the March data tells us
The fact that 1.93 billion RINs were generated in March signals that biofuel production is ramping back up. After a brutal 2025 where plants went idle and production dropped sharply, the industry is recovering. The EPA's record-high blending mandates for 2026 and 2027 are pulling production back online, and the RIN data is the proof.
Total RIN generation for the first quarter of 2026 reached nearly 4.9 billion. That pace needs to accelerate significantly to meet the new volume targets, which means even more production is coming and even more feedstock will be needed.
The bottom line
You do not need to become a RIN trader to benefit from understanding this system. But knowing the basics helps you understand why the market values your product the way it does.
Every gallon of used cooking oil you collect has the potential to generate compliance credits worth real money in a federal market that refiners are legally required to participate in. That is not going away. The mandates are in place. Production is ramping up. And RIN generation is climbing.
The grease you pick up from restaurants is not just waste oil. It is the raw material behind a multi-billion-dollar compliance market. And the more you understand that, the better positioned you are to capture your share of the value.
