Regional Greenhouse Gas Initiative

The Regional Greenhouse Gas Initiative (RGGI) is a cooperative effort by nine Northeast and Mid-Atlantic states to limit greenhouse gas emissions. The nine states participating in RGGI -- Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New York, Rhode Island, and Vermont -- are implementing the first mandatory cap-and-trade program in the United States to reduce greenhouse gas emissions.

Through independent rules and/or regulations (based on the RGGI "Model Rule") each state limits emissions of CO2 from electric power plants, creates CO2 allowances, and establishes participation in CO2 allowance auctions. The regulations apply to fossil fuel-fired electric generating units that have with a nameplate capacity of 25 megawatts or greater. Regulated power plants may use a CO2 allowance issued by any of the nine participating states to demonstrate compliance with an individual state program.

In addition, CO2 offset allowances may be used to demonstrate compliance. A RGGI CO2 offset allowance represents a project-based greenhouse gas emission reduction outside of the capped electric power generation sector. At this time, the RGGI participating states limit the award of offset allowances to the following five project categories: 

  • Landfill methane capture and destruction
  • Reduction in emissions of sulfur hexafluoride (SF6) in the electric power sector.
  • Sequestration of carbon due to afforestation;
  • Reduction or avoidance of CO2 emissions from natural gas, oil, or propane end-use combustion due to end-use energy efficiency in the building sector
  • Avoided methane emissions from agricultural manure management operations.

To obtain offset application materials for offset projects located in Vermont , please email:


RGGI Offsets

RGGI Program Review 2016-2017

RGGI Model Rule Updates - September 2017

Vermont CO2 Budget Trading Regulations Stakeholder Information Session March 22, 2018

More information about RGGI, the participating states, CO2 allowance auctions, emissions, offsets and the 2016 Program Review is available at: