CO2 allowances are issued by each RGGI State in an amount defined in each state's applicable statute and/or regulations. Together, all the CO2 allowances issued by all the RGGI States comprise the RGGI cap.
The RGGI 2015 cap is 88.7 million short tons.
The RGGI 2015 adjusted cap is 66.8 million short tons. 66.8 million is the number of CO2 allowances allocated by the RGGI states for 2015.
For more details on the distribution of CO2 allowances by state, download the full data here: [ PDF ] [ XLS ]