United Natural Foods, Inc. is adding 53 all-electric transport refrigerated trailer units (TRUs) to its fleet located at the company’s Riverside, Calif. distribution center. The company is one of the first wholesalers to utilize the technology and comes as the California Air Resources Board (CARB) announced plans in January to impose zero-emission requirements on TRUs sold or operated in California by 31 December 2029.

The all-electric TRU achieves zero-emission results by using a high efficiency refrigeration system powered by roof-mounted solar photovoltaic panels, a wheel-momentum generator, lithium-ion batteries, and a unique auxiliary power unit to eliminate the requirement for diesel fuel to power the refrigeration system.

Through this process, the refrigeration system provides multi-zone temperature settings with the capability of maintaining a full load of frozen product from -10 to -20 ˚F throughout the distribution route.

To accomplish this work, UNFI is removing 53 of its diesel-powered TRUs from operation and utilizing Advanced Energy Machines (AEM), a leader in the electrification of refrigerated trailers, to rebuild the units to all-electric specifications.

UNFI will lease the TRUs through PLM Trailer Leasing for five years while the company continues to explore how they integrate into its operations. By operating the all-electric TRUs, UNFI anticipates it will save approximately 135,000 gallons of diesel fuel per year while reducing particulate matter pollutant emissions and greenhouse gas emissions.

Nearly 50 percent of UNFI’s direct greenhouse gas emissions are from our fleet of trucks and trailers. These 53 all-electric TRUs will help us get a head start on the proposed CARB zero-emission requirements, and are expected to allow us to decrease our emissions as we make progress on our climate action commitments under Better For All.

Adding these TRUs comes after an exhaustive 4-month pilot testing the equipment through a variety of conditions with the intention to replace diesel-powered TRUs. When we look at it from an operational standpoint, we’re not changing anything, but it gives us a fresh look at running our operations and finding additional efficiencies.

—Jeff Wismans, national director of fleet operations at UNFI

To help reduce the cost of retrofitting the diesel powered TRU, PLM applied for and received vouchers on UNFI’s behalf through CARB’s Clean Off Road Equipment (CORE) Voucher Incentive Project. CARB launched CORE in 2017 to accelerate the purchase of zero-emission freight handling equipment in California by providing a streamlined voucher process to offset the higher cost of such technologies.