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This story was originally published by Grist. You can subscribe to its weekly newsletter here.
The U.S. Environmental Protection Agency has proposed new standards for how much of the nation’s fuel supply should come from renewable sources.
The proposal, released last month, calls for an increase in the mandatory requirements set forth by the federal Renewable Fuel Standard, or RFS. The program, created in 2005, dictates how much renewable fuels — products like corn-based ethanol, manure-based biogas, and wood pellets — are used to reduce the use of petroleum-based transportation fuel, heating oil, or jet fuel and cut greenhouse gas emissions.
The new requirements have sparked a heated debate between industry leaders, who say the recent proposal will help stabilize the market in the coming years, and green groups, which argue that the favored fuels come at steep environmental costs.
Below is a Grist guide to this growing debate, breaking down exactly what these fuels are, how they’re created, and how they would change under the EPA’s new proposal:
The fuels
Renewable fuel is an umbrella term for the bio-based fuels mandated by the EPA to be mixed into the nation’s fuel supply. The category includes fuel produced from planted crops, planted trees, animal waste and byproducts, and wood debris from non-ecological sensitive areas and not from federal forestland. Under the RFS, renewable fuels are supposed to replace fossil fuels and are used for transportation and heating across the country, and are supposed to emit 20 percent fewer greenhouse gasses than the energy they replace.
Under the new EPA proposal, renewable fuels would increase by roughly 9 percent by the end of 2025 — an increase of nearly 2 billion gallons. The new EPA proposal will set a target of almost 21 billion gallons of renewable fuels in 2023, which includes over 15 billion gallons of corn ethanol. By 2025, the EPA hopes to have over 22 billion gallons of different renewable fuel sources powering the nation.
Advanced biofuel, a type of renewable fuel, includes fuel created from crop waste, animal waste, food waste, and yard waste. This also includes biogas, a natural gas produced from the methane created by animal and human waste. Advanced biofuel can also include fuels created from sugars and starches, apart from ethanol.
In its newest proposal, the EPA suggests a roughly 14 percent increase in the use of these fuels from 2023 to 2024 and a 12 percent increase the year after that. The EPA wants roughly 6 billion gallons of advanced biofuel in the marketplace by this year.
Nestled inside of the advanced biofuel category is biomass-based diesel, a fuel source created from vegetable oils and animal fats. This fuel can also be created from oils, waste, and sludge created in municipal wastewater treatment plants. Under the new EPA proposal, the agency is suggesting a 2 percent year-over-year increase in these fuels by the end of 2025, which equals a final amount of nearly three billion gallons.
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