Will the project affect air quality?

The project will utilize best available control technology (including urea and a Selective Catalytic Reduction (SCR) system to minimize NOx emissions) and will be amongst the cleanest and most modern projects of its type. Pre-commercial operation air modeling has been conducted in strict accordance with all MA DEP regulations. Actual emissions will be monitored following commercial operation to ensure regulatory compliance. Additionally, the MA DEP has determined that Project 2015A is a Non-Major Source since the maximum potential emissions from the Project are well below the thresholds that would categorize the Project as a Major Source. When the capacity from the project is available, PMLP will begin the process of retiring our oldest generator (installed in 1971) which will have a net effect of improved air quality as explained in the Statement from PMLP Regarding Waters River Unit 1 (PDF).

The Project's SCR for controlling smog-producing NOx emissions and its ultra-high efficiency and heat rate for reducing greenhouse gas emissions result in a significant reduction in air emissions within the City of Peabody. A comparison of the emissions characteristics of the existing PMLP unit (Unit 1) that is being replaced and the new MMWEC unit associated with the project is as follows:

  • NOx emissions on a per megawatt-hour (mwh) basis will be 92.9% lower.
  • Greenhouse Gas on a per mwh basis will be 29.7% lower.
EmissionExisting PMLP Unit (1971 P&W FT4)New MMWEC Unit (2022 Mitsubishi FT4000)
Average NOx
6.6 pounds per megawatt-hour (lb per mwh)
0.47 lb per mwh
Greenhouse Gas with Ultra-Low Sulfur Diesel (USLD)
1,582 lb per mwh
1,112 lb per mwh

Show All Answers

1. What fuel will be used to power this project?
2. How often will the turbine run?
3. Will the project affect air quality?
4. Doesn’t the project conflict with the state’s decarbonization roadmap of net-zero by 2050?
5. Is PMLP Going to Meet Its Renewable Targets?