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Maryland State Government Maryland Department of the Environment

Regional Greenhouse Gas Initiative

Maryland CO2 Budget Trading Program Auctions

To support the state CO2 Budget Trading Programs, the RGGI participating states have implemented a regional auction platform to sell CO2 allowances. The twenty-eighth auction of CO2 allowances was held on June 3, 2015. Maryland, as a participating state, sold 3,053,288 allowances for vintage year 2015 at $5.50 per allowance. (See RGGI Press Release.)

The Regional Greenhouse Gas Initiative (RGGI) is a cooperative effort by nine Northeast and Mid-Atlantic states to reduce carbon dioxide (CO2) emissions from electricity generating plants.  RGGI includes Maryland, Connecticut, Delaware, Maine, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont. 

Power sources, coal, solar and wind and pretty flowering plants

In the United States, RGGI is the first program of its kind, a multi-state emissions cap and trade program with a market-based emissions trading system.  The cap and trade program is designed to reduce CO2, a greenhouse gas, while maintaining electricity affordability and reliability.  Maryland's participation in RGGI will reduce CO2 emissions from the State's electricity generators by roughly 10 percent from current levels by 2019. The program also directly funds energy efficiency and cleaner energy programs that will lower greenhouse gas emissions.

If you have a question please contact Luke Wisniewski at 410.537.4231 or

Maryland formally joined RGGI on April 20, 2007, by signing the Second Amendment to the RGGI Memorandum of Understanding (MOU).  The signed MOU is available here and the first amendment to the MOU is available here.

  • Stakeholder Presentation: The Regional Greenhouse Gas Initiative

  • News Twenty-eighth CO2 Auction held on June 3, 2015. More information  here.

  • Maryland CO2 Budget Trading Program Information regarding offset projects can be found here.

  • Regulations and Related Meetings More information here.

  • RGGI Facts How does a cap and trade program work?  What will generators need to do?  Click here.

  • Research What are the effects of different levels of energy efficiency spending?  What is Maryland's Strategic Electricity Plan?  Click here.

  • Additional Resources Links to programs in and outside of Maryland Click here.