Sulfur hexafluoride is a commonly used insulator in electricity transmission and distribution equipment. Because of its high global warming potential (GWP), CARB adopted the Regulation for Reducing Sulfur Hexafluoride Emissions from Gas Insulated Switchgear in 2010. In response to emerging technologies using lower or zero GWP insulators, CARB amended the regulation in 2021 to further reduce greenhouse gas emissions from gas-insulated equipment. Key provisions of the amended regulation include a phase-out schedule for new sulfur hexafluoride gas-insulated equipment, coverage of other greenhouse gases beyond sulfur hexafluoride used in gas-insulated equipment, and other changes that enhance accuracy of emissions accounting and reporting.
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Read the Amended Regulation
The Regulation for Reducing Greenhouse Gas Emissions from Gas-Insulated Equipment became effective January 1, 2022.