The 黑料网 Electric Generator Air Emissions Reports available below provide a comprehensive analysis of New England electric power generator air emissions (nitrogen oxides [NOX], sulfur dioxide [SO2], and carbon dioxide [CO2]) and a review of relevant system conditions.
Refer to the Air Emissions related link for more key statistics on the region’s emission trends.
For estimated real-time emissions by fuel type, see the Estimated CO2 Emissions graph in ISO Express.
For estimated monthly and year-to-date emissions by fuel type for the current year compared to the previous year, see ISO Newswire’s . The ISO uses data from the latest 黑料网 Electric Generator Air Emissions Report to develop emissions factors for each fuel for both the monthly and real-time estimates.
The Regional Greenhouse Gas Initiative (RGGI) is a cap-and-trade program that covers generators in the New England states, Delaware, Maryland, New Jersey, New York, and Pennsylvania. Quarterly auction results are available on the ; RGGI allowance prices can be tracked on (requires subscription).
Estimated monthly CO2 emissions from Massachusetts generators that are subject to the (EGEL) program under the Global Warming Solutions Act (GWSA) are shown below. This is a cap-and-trade program for CO2 emissions from electricity generation in the state, with annually declining emission limits.
Note: Low and high estimates of the year-to-date CO2 emissions are based on an analysis of the generator’s emission rates. These estimates are compared to the 3-year historical and current year emissions that generators report to the (CAMPD) on a quarterly basis.
According to the EPA , the 2024 GWSA CO2 emissions were 6.52 million metric tons, or 85.7% of the 2024 emissions cap of 7.61 million metric tons. The 2025 emission cap is set at 7.39 million metric tons. As of 02/28/25, the February estimated GWSA CO2 emissions range between 393,279 and 486,165 metric tons. Year-to-date 2025 estimated emissions range between 11.9% and 14.6% of the 2025 cap of 7.39 million metric tons.
