Delaware is a member of the Regional Greenhouse Gas Initiative (RGGI) so has cap and trade control on power plant emissions. They also have joined the Transportation and Climate Initiative, and have joined a select group of TCI states to cap transportation emissions and trade emission permits in a system modeled after RGGI.
The League of Women Voters of Delaware did a study on carbon pricing in 2015-2016. Their findings can be found here.
Last updated February 4, 2019