https://www.vice.com/en_us/article/3an4k8/dont-expect-the-usps-fleet-to-go-electric

On Tuesday, President Joe Biden announced he wants the U.S. government to electrify its vehicle fleet as part of his climate and jobs initiatives. 

"The federal government also owns an enormous fleet of vehicles, which we’re going to replace with clean, electric vehicles made right here in America by American workers, creating millions of jobs—a million autoworker jobs in clean energy—and vehicles that are net-zero emissions," Biden said in prepared remarks. He further established a climate task force that will, among other things, work with existing agencies to create a plan within 90 days to electrify the vehicle fleet.