The city of San Diego, CA’s climate action plan is seeking to reach net zero carbon emissions by 2035 in part by phasing out natural gas use in new and existing buildings.

Under the draft 2021 plan, natural gas would be banned in building construction starting in 2023, with an all-electric requirement in place at new residential and commercial developments.

The city also plans to develop a roadmap to achieve decarbonization of existing buildings. The target would phase out 45% of natural gas in existing buildings by 2030. In 2035, the city is planning to phase out 90% of natural gas use in existing buildings.

The plan would also phase out natural gas in 100% of municipal buildings by 2035. The California Air Resources Board has said that buildings account for one-quarter of...