2006 - 2016

  • SEPTA began tracking GHG emissions in 2006
  • 80 x 50 reduction goal for 2016: 184,780,576 lbs CO2-E
  • Actual 2016 reductions: 188,505,521 lbs CO2-E (19%)
  • Regional eGrid emissions factor decreased by over 25% between 2006-2016


Wayside Energy Storage System /Regenerative Braking
SEPTA's "wayside energy storage system" (WESS) made it possible to capture, store, and reuse the regenerative braking energy from railcars on a section of the Market-Frankford Line. The WESS in combination with more aggressive regenerative braking thresholds allowed SEPTA to reduce electricity used to power the Market-Frankford Line resulting in emission reductions totaling 59,375,279 lbs CO2-E (6%).

Hybrid-Electric Buses
Since 2012, SEPTA has purchased 747 hybrid-electric buses that utilize regenerative braking power and auxiliary units. Integrating hybrid-electric buses has reduced fuel consumption by increasing the miles per gallon rating of SEPTA's bus fleet. Additionally, integrating hybrid-electric buses reduced emissions by 21,118,283 lbs CO2-E (2%).

Biodiesel Blend
In 2010, SEPTA transitioned to fueling diesel powered vehicles with a biodiesel blend. Emissions from this biodiesel blend (B2) are approximately 2% cleaner than traditional diesel. Utilizing B2 reduced SEPTA's emissions by 6,393,154 lbs CO2-E (1%).

Silverliner V-Fleet
The Silverliner V fleet regenerative braking system improvements allowed SEPTA to increase the efficiency of the rail fleet by 0.19 kWh per car mile. Doing so reduced emissions by 4,996,332 lbs C02-E (<1%).


  • Electric Engine Cooling System - 2,895,351 lbs CO2-E (<1%)
  • Lighting Change-Outs - 2,379,109 lbs CO2-E (<1%)
  • Gen-Set Engines for Maintenance Locomotives - 50,439 lbs CO2-E (<1%)

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