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In addition to carbon and methane, other anthropogenic greenhouse gases include nitrous oxides and fluorinated gases, including sulfur hexafluoride.
Sulfur hexafluoride (SF6) is a potent greenhouse gas that is used as an electric insulator in high-voltage equipment along the power grid. The company implemented best-management practices to minimize SF6 emissions from its electric transmission and distribution system, including the inspection of switch gear for gas pressure (which indicates leakage), replacing or conducting maintenance on leaking equipment, using SF6 charging and reclamation equipment, removing SF6 before breakers are sold or scrapped, testing and reusing (i.e., recycling) SF6, deploying laser leak-detection equipment, and following extensive written procedures and conducting training for handling SF6. We reduced our SF6 equipment leak rate by 84 percent and its emissions of SF6 by approximately 66 percent since 2011.
From 2000 to 2018, we reduced emissions of nitrogen oxide, sulfur dioxide and mercury from our power generation fleet, measured in pounds per net megawatt-hour, by 94 percent, 99 percent and 98 percent respectively.
Our Green Fleet
More than one in three of the vehicles in our on-road fleet, over 7,000 cars and trucks, are powered by alternative fuels. Our green fleet includes electric, natural gas and biodiesel vehicles that are helping us to lower carbon emissions, improve conditions in the field, and reduce worksite noise levels. By 2025, 25% of our light-duty fleet is expected to be battery-electric or plug-in electric vehicles.
Our western-state gas operations are looking to secure partnerships that can increase the use of renewable natural gas at our public compressed natural gas fueling stations. We applied for and received regulatory approval to allow third-party RNG suppliers to dispense RNG at our stations. We also intend to secure RNG for our own supply at such stations.