Model Rule and MOU Versions

The RGGI Model Rule

The Model Rule is a set of proposed regulations that form the basis for each RGGI State's CO2 Budget Trading Program. Since August of 2006, the Model Rule has been corrected and revised to maintain consistency between individual state rules.

On March 23, 2006, the RGGI States released a draft version of the model rule for public comment. The states received over 1,000 pages of comments from more than 100 organizations over a period of 60 days. Taking these comments into account, the RGGI States issued an updated Model Rule on August 15, 2006.

On January 5, 2007, the RGGI States issued a corrected Model Rule reflecting non-substantive technical adjustments to the August 15, 2006 Model Rule.

On December 31, 2008, the states issued a further revised Model Rule to reflect consistencies among state rules.

In 2012, the RGGI states conducted a comprehensive Program Review process, including extensive research, modeling, and stakeholder outreach and commentary. The RGGI states released a revised Model Rule reflecting new program improvements on Feb. 7, 2013, and non-substantive technical revisions to this rule were released on December 23, 2013.

In 2016, the RGGI states again conducted a Program Review process which resulted in the release of a revised 2017 Model Rule on Dec. 19, 2017. The participating states will next move forward with state-specific processes to implement statutes/regulations based on this revised Model Rule. More information on next steps is available in the Principles to Accompany Model Rule Amendments, released at the same time.


2017 Model Rule Documents Format Date
2017 Model Rule PDF 12.19.17
2017 Model Rule (Redlined) PDF 12.19.17
Summary of Model Rule Changes PDF 12.19.17
Principles to Accompany Model Rule Amendments PDF 12.19.17



2013 Model Rule Documents Format Date
2013 Model Rule PDF 2.7.13
Summary of Model Rule Changes                    . PDF 2.7.13


2008 Model Rule Format Date
2008 Model Rule                                                  .                 . PDF 12.31.08


2007 Model Rule Documents Format Date
2007 Model Rule With Non-Substantive Technical Revisions PDF 1.5.07
Overview of Non-Substantive Technical Revisions PDF 1.5.07
Redline of Non-Substantive Technical Revisions PDF 1.5.07


2006 Model Rule Documents Format Date
2006 Draft Model Rule For Public Comment PDF 3.23.06
Summary of Draft Model Rule for Public Comment            . PDF 3.23.06
Staff Working Group Memo on Draft Model Rule PDF 3.23.06
2006 Model Rule After Public Comment PDF 8.15.06
Redline of Revisions to Model Rule PDF 8.15.06
Post-Model-Rule Action Plan PDF 8.6.06


The RGGI Memorandum of Understanding

On December 20, 2005, seven states announced an agreement to implement the Regional Greenhouse Gas Initiative, as outlined in a Memorandum of Understanding (MOU) which outlines the framework for a Model Rule.  The MOU was signed by the Governors of the participating states, including Connecticut, Delaware, Maine, New Hampshire, New Jersey, New York, and Vermont.

In 2006, in response to public comments, the states agreed to substantive amendments to the MOU. Those amendments were signed by the agency heads of the energy regulatory and environmental agencies in each participating state. In early 2007, Massachusetts and Rhode Island, which had participated in the early development of RGGI, signed the MOU, as did Maryland later that year. 

On November 29, 2011 New Jersey withdrew its agreement to the MOU, effective January 1, 2012.


NJ Withdrawal Format Date
New Jersey Withdrawal of Agreement to Memorandum of Understanding PDF 11.29.11


MOU Amendments Format Date
Amendment to Memorandum of Understanding PDF 8.31.06
Second Amendment to Memorandum of Understanding PDF 4.20.07


2005 MOU Format Date
Memorandum of Understanding                                             . PDF 12.20.05