U.S. EPA elaborates on Phase 2 greenhouse gas (GHG) and fuel efficiency standards for heavy-duty vehicles

Niels Tholen - 24 November 2014

The U.S. Environmental Protection Agency (EPA) presented details on the impending Phase 2 greenhouse gas (GHG) and fuel efficiency standards at the 7th Integer Emissions Summit USA 2014 in October. Matt Spears, Center Director of Heavy-Duty Diesel Standards outlined the role of the transportation sector in GHG emissions in the U.S., with medium and heavy-duty vehicles accounting for 20% of GHG emissions. Spears elaborated that the number of heavy-duty vehicles on the road is expected to increase by 70% by 2040.

Spears declared Phase 1 has been a success so far, reporting that reduced fuel consumption has saved 530 million barrels of oil, lowered GHG emissions by 270 metric million tonnes, and provided $50 billion in fuel savings.

Looking at Phase 2 standards, Spears noted that new technology may have to be included as Phase 2 would be both more stringent and include regulating trailers compared to Phase 1. A key area that the standards may address is a full vehicle approach, where the entire vehicle is regulated for refined test procedures and updates to the GHG emissions vehicle compliance simulation model, rather than the regulation of individual components.

The Phase 2 proposal will be published for consultation in March 2015, finalized in March 2016 and implemented in 2020.

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