Here's an article on the replacement process, which is held up in the general USPS review that should be released soon... https://www.trucks.com/2018/10/01/usps-mail-truck-decision-d... https://about.bgov.com/blog/postal-service-prepares-splash-m...

They have been using some electric vehicles in NYC: https://about.usps.com/what-we-are-doing/green/vehicles.htm

The VT Hackney option looks pretty cool: https://www.trucks.com/2018/03/15/new-photos-electric-mail-t...