Colorado moved to boost electric-car sales by taking the first step toward adopting a zero-emission-vehicle mandate patterned after one in California that’s under threat from the Trump administration.
Gov. Jared Polis (D) signed an executive order directing Colorado environmental officials to propose the zero-emission-vehicle rule by no later than May 2019 to the state’s Air Quality Control Commission.
The mandate would make Colorado the 10th state to join California’s electric-car posse that’s enacted rules requiring automakers to sell more electric cars each year. California regulators estimate the program will lead to pure-electric and plug-in hybrid cars accounting for 8...