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The document outlines the GIS-based methodology used to assess the proximity of electricity generating units and substations to environmental justice (EJ) populations in Massachusetts. It details the data sources used, including S&P Global and utility plans, and explains the criteria for identifying EJ neighborhoods based on state law. The analysis specifically focused on utility-scale projects and proposed infrastructure to ensure that future siting decisions do not replicate past failures of overburdening vulnerable populations.

The analysis reveals that over 80% of existing polluting electricity generating units and nearly 70% of substations in Massachusetts are located in or near environmental justice (EJ) neighborhoods. It warns that current trends in proposed infrastructure, including a new fossil-fuel peaker plant and several substations, continue to overburden these communities. The authors recommend integrating cumulative impact assessments, expanding the Energy Facilities Siting Board to include EJ and Indigenous representation, and prioritizing public health and climate targets in siting decisions.

The report evaluates the US coal fleet's economic viability against alternatives like natural gas and renewables, finding that 38% of the 2016 fleet faces an uncertain near-term future due to being either uneconomic or announced for retirement. It also estimates that emissions reductions from 2008 to 2016 provided $250 billion in public health and climate benefits. A proximity analysis indicates that while many coal plants are located in low-income and minority communities, the demographic distribution of the fleet has not changed significantly during the transition.

The document details two environmental justice studies. The first analyzed PM2.5 emissions from natural gas and coal-fired power plants in the Northeast US between 2011 and 2015. The second used GIS buffer analysis to determine if low-income households and people of color live closer to PFAS-contaminated facilities than white or higher-income households in the US and Michigan. Findings for PFAS contamination show that in Michigan, 48.72% of households within five miles of a contaminated site are low-income, compared to 14.51% statewide. Nationally, people of color represent 34.59% of the population within three miles of PFAS sites, compared to 27.03% of the general US population.