On August 23, Colorado became the 11th state to join California’s ZEV program. This means that automakers must increase sales ZEVs from the current 2.6% of cars sold in Colorado to 6.23% by 2030. See this article for a FAQ on all the details of this new legislation:
https://coloradosun.com/2019/08/13/as-colorado-considers-an-electric-vehicle-mandate-heres-what-to-expect/

Colorado will join 10 other states currently implementing clean car programs that include both low-emission and zero-emission vehicle standards. The program is part of the plan to reduce pollution established in the climate legislation recently adopted by the Colorado General Assembly and signed into law by Governor Jared Polis.

Two auto industry groups, the Alliance of Automobile Manufacturers and Global Automakers, supported adoption of the Colorado ZEV program.
However the Colorado Automobile Dealers Association says that requiring manufacturers to sell a certain percentage of low-emission and electric vehicles in Colorado will reduce buyers’ choices and increase prices.

The Colorado Sun published an article last month about how EVs and ZEV regulation can affect the income streams of car dealerships.