The U.S. Postal Service pledged Wednesday to electrify at least 40 percent of its new delivery fleet, an increase that climate activists hailed as a major step toward reducing the government's environmental footprint. The Postal Service had been set to purchase as many as 165,000 vehicles from Oshkosh Defense, of which 10 percent would have been electric under the original procurement plan. Now it will acquire 50,000 trucks from Oshkosh, half of which will be EVs. It will also buy another 34,500 commercially available vehicles, with sufficient electric models to make 4 in 10 trucks in its delivery fleet zero-emission vehicles. The announcement comes after 16 states, the District of Columbia, and four of the nation's top environmental groups sued the mail agency in the spring to prevent the original purchase plan, or compel it to buy more electric trucks. The mail agency's combined purchase of 84,500 trucks which begin hitting the streets in late 2023 " will go a long way toward meeting President Biden's goal for the entire government fleet to be EV-powered by 2035. The Postal Service's more than 217,000 vehicles make up the largest share of federal civilian vehicles. Congress in March also passed a $107 billion agency overhaul, freeing up money that postal leaders had long sought for capital improvements. Lawmakers ... pointed to the agency's need for new trucks " its fleet now is 30 years old, and has neither air bags nor air conditioning " to keep up with private-sector EV investments in approving the legislation.