Diesel Group Pushes SCR Tech at EPA Hearing
- ETF testified on advanced diesel tech at EPA hearing
- SCR systems reduce NOx emissions by over 90%
- Industry warns against premature shift to electric
- Trucking sector relies on diesel for long-haul efficiency
- Renewable diesel compatibility highlighted as key advantage
The Engine Technology Forum testified before the Environmental Protection Agency on Wednesday, arguing that advanced diesel technology remains essential for the nation's energy transition.
Representatives from the industry group appeared at the EPA hearing to defend the role of modern diesel engines and Selective Catalytic Reduction systems in reducing emissions.
They warned regulators that ignoring the potential of next-generation diesel could hinder environmental goals.
The hearing comes as the agency considers new rules for heavy-duty vehicle emissions.
Industry leaders urged the EPA to maintain a technology-neutral approach rather than mandating specific solutions like electric trucks.
Officials from the forum presented data showing that today's diesel engines are near-zero in emissions compared to models from two decades ago.
They emphasized that diesel power still fuels the vast majority of freight movement across the United States.
The testimony aimed to counter a narrative that internal combustion engines are obsolete in the fight against climate change.
Diesel is not the dirty fuel of the past, the group argued, but a high-tech solution available right now.
The forum's presentation highlighted the speed at which the trucking fleet turns over.
They noted that forcing a rapid switch to electric vehicles could leave older, dirtier trucks on the road longer.
This happens because new electric trucks remain expensive and difficult to charge for long-haul operations.
By contrast, the latest diesel trucks can be deployed immediately without new infrastructure.
The group stressed that climate change requires urgent action.
Waiting decades for the electric grid to catch up is not a viable strategy, they said.
Advanced diesel offers immediate reductions in greenhouse gases and pollutants.
The EPA listened to arguments about the total cost of ownership for fleet operators.
Small trucking companies operate on thin margins and cannot absorb the high upfront costs of electric vehicles.
The forum argued that preserving the diesel option protects these businesses and the supply chain they support.
Wednesday's hearing was part of a broader review of the agency's heavy-duty emissions standards.
The outcome could shape the trajectory of the American transportation sector for the next 20 years.
- Diesel powers over 70% of US freight.
- New diesel engines emit 90% less NOx than older models.
- The ETF represents manufacturers of engines and emissions equipment.
Inside the SCR Tech That Cuts Diesel Emissions
The centerpiece of the Engine Technology Forum's argument was Selective Catalytic Reduction, known widely as SCR.
This technology has revolutionized the environmental performance of diesel engines over the last 15 years.
SCR works by injecting a mist of Diesel Exhaust Fluid into the exhaust stream.
This fluid is a solution of urea and deionized water, often carried in a separate tank on the vehicle.
Once injected, the fluid passes through a catalyst where a chemical reaction occurs.
This reaction breaks down harmful nitrogen oxides, or NOx, into harmless nitrogen and water vapor.
Nitrogen oxides are a major contributor to smog and respiratory problems.
The EPA has targeted these pollutants for decades because of their impact on public health.
SCR systems are incredibly effective at removing these toxins from the exhaust.
Industry data shows the technology can reduce NOx emissions by more than 90%.
This performance meets or exceeds even the strictest current standards in California.
The system operates passively for the driver.
Sensors monitor the exhaust and automatically adjust the fluid injection to ensure optimal performance.
This means the engine runs efficiently while emissions stay low.
The technology is now standard on almost all new heavy-duty diesel trucks in America.
The forum explained that SCR is a mature, proven technology.
Unlike some experimental solutions, SCR is available at scale today.
Manufacturers have refined the systems to be durable and reliable in harsh operating conditions.
Truckers can drive hundreds of thousands of miles with minimal maintenance on the SCR components.
The fluid itself is widely available at truck stops and fueling stations across the country.
This existing infrastructure is a massive advantage over electric charging networks.
The forum pointed out that SCR also helps improve fuel economy.
By allowing the engine to run at its most efficient combustion point, the system reduces fuel consumption.
Lower fuel use means directly lower carbon dioxide emissions.
This dual benefit makes SCR a key tool for addressing climate change alongside air quality.
The testimony detailed the evolution of this technology.
Early versions were complex, but modern systems are integrated seamlessly into the engine design.
The forum emphasized that continued investment in diesel tech will yield further gains.
Future generations of SCR could be even smaller and more efficient.
- SCR reduces NOx by up to 90%.
- Diesel Exhaust Fluid is 32.5% urea.
- The tech is standard on most new heavy trucks.
EPA Faces Pressure to Balance Zero-Emission Goals
The EPA hearing took place against a backdrop of intense regulatory pressure.
The agency is currently developing the next phase of its heavy-duty greenhouse gas emissions standards.
These rules are designed to push the trucking industry toward zero-emission vehicles.
The Biden administration has set ambitious targets for electrifying the transportation sector.
Officials want to see a significant shift away from fossil fuels in the coming years.
However, the Engine Technology Forum pushed back on a rigid timeline.
They argued that the EPA must consider the reality of the market and the grid.
Analysts note that heavy-duty trucks require massive battery packs to maintain range.
These batteries add significant weight, which reduces the payload capacity of the truck.
A lighter payload means more trips are needed to move the same amount of goods.
This paradoxically increases energy consumption and traffic.
The forum presented studies showing that total emissions might not drop as expected with a rapid electric mandate.
They argued for a lifecycle analysis that includes electricity generation.
If the power grid relies on coal or natural gas, electric trucks are not truly zero-emission.
In contrast, renewable diesel fuels can be used in existing engines with immediate carbon benefits.
The EPA faces a difficult balancing act.
Environmental groups are pushing for the strongest possible rules to fight climate change.
They argue that delaying the transition locks in carbon emissions for decades.
These groups want the EPA to force manufacturers to sell more electric trucks sooner.
But the industry coalition warns of unintended consequences.
They cite supply chain shortages for critical minerals like lithium and cobalt.
These materials are essential for battery production but are largely sourced from overseas.
Relying on foreign supply chains creates national security risks, the forum argued.
Diesel engines, on the other hand, are manufactured domestically and supported by a vast existing workforce.
The hearing also touched on the reliability of electric trucks in extreme weather.
Cold temperatures can significantly reduce battery range.
For truckers operating in the northern states, this is a critical safety and operational concern.
Diesel engines perform reliably in sub-zero conditions.
The forum urged the EPA to set performance-based standards rather than prescribing specific technologies.
This approach would allow manufacturers to innovate using the best solution for each application.
It could include hybrids, hydrogen fuel cells, or advanced diesel.
The EPA has not yet released a draft of the proposed rules.
Industry insiders expect a fierce debate once the details are made public.
The testimony on Wednesday was an opening shot in that lobbying battle.
- Heavy trucks account for nearly a