By issuing a pair of vetoes Thursday, Virginia Gov. Ralph Northam sent a message to the legislature and beyond that he is intent on sticking with an aggressive carbon-cutting agenda.
Stakeholders said cutting greenhouse gases from transportation will be more complex than power plants.
More ambitious targets and other reforms spurred higher auction prices and more money for efficiency programs.
Dozens of signatories argue that state regulators have a constitutional duty to address climate change.
The initiative is expected to create new revenue for renewable energy and climate change resilience projects.