Reported emissions from the Electronics Manufacturing sector decreased from 7.0 million metric tons (MMT) CO₂e in 2011 to 65.3 8 MMT CO₂e in 20182019, a decrease of 917.2 1 percent. Emissions decreased 25.4 7 percent from 2011 to 2013, due primarily to a large reduction in combustion emissions at one plant. Emissions increased after 2013, due in part to a rule revision that changed the emission factors used by facilities to estimate emissions, resulting in higher estimated emissions. The increasing complexity of semiconductor products (necessitating an increase in the use of fluorinated GHGs in the manufacturing process) may have also contributed to the increase in reported emissions between 2011 2013 and 20132014.

Reported emissions for 2014 through 2018 have remained fairly stable, with emissions fluctuating by only 0.1 to 0.2 MMT CO₂e per year. The lowest emissions reported during this period were reported in 2016 (6.2 MMT CO₂e) and 2017 (6.1 MMT CO₂e). The lower emissions during these years are likely were due in part to a decrease in the number reporters, which dropped from a high of 59 in 2014 to a low of 45 51 in 2017. In 2018, the reported emissions increased by almost 4 3.3 percent to a high of 6.3 MMT CO₂e and , while the number of facilities reporting increased decreased to 49.

Reported emissions in 2019 dropped by almost 8 percent to 5.8 MMT CO₂e, the lowest reported emissions since the subpart I emission factors were updated in 2013. The decrease in emissions in 2019 is due in part to changes in manufacturing processes and decreases in gas consumption.