Energy Efficiency in Existing Buildings

California has long been a leader in efforts to improve building energy efficiency, both at the time of construction and upon a major remodel or equipment replacement. The first Energy Efficiency Action Plan was required by California Assembly Bill 758 in 2015. The 2021 Energy Efficiency Action Plan, the most recent version, was covered in two documents, 1) The 2021 California Building Decarbonization Assessment, and 2) The final 2021 Integrated Energy Policy Report Volume I Building Decarbonization. Since then, building energy efficiency and decarbonization have assumed a more prominent role in efforts to cost-effectively reduce greenhouse gas emissions, improve public health, and address longstanding energy equity concerns. The 2025 Building Energy Action Plan will be published in late 2025. The report will identify challenges and make recommendations to Department of Energy, and other stakeholders about what’s needed to move existing building energy efficiency and decarbonization forward in California. Expand All Collapse All 2025 California Building Energy Action Plan View Docket Log (23-DECARB-03 ) for the 2025 California Building Energy Action Plan Submit a comment  for the 2025 California Building Energy Action Plan California Building Energy Action Plan Report 2021 California Energy Efficiency Action Plan 2021 Building Decarbonization Assessment Final 2021 Integrated Energy Policy Report Volume I Building Decarbonization 2019 California Energy Efficiency Action Plan 2019 Energy Efficiency and Building Decarbonization ( Docket Log 19-IEPR-06 Final 2019 California Energy Efficiency Action Plan Supporting methodology report 2016 California Energy Efficiency Action Plan 2016 Existing Buildings Energy Efficiency Action Plan ( Docket Log 16-EBP-01 2016 Existing Buildings Energy Efficiency Action Plan Update 2015 Existing Buildings Energy Efficiency Action Plan 2015 Existing Buildings Energy Efficiency Action Plan Energy Efficiency Savings Workbooks Scenario 1 Scenario 1 - Electricity and Natural Gas Scenario 1 - Combined Energy Scenario 1- Greenhouse Gas (GHG) Reductions Scenario 2 Scenario 2 - Electricity and Natural Gas Scenario 2 - Combined Energy Scenario 2 - GHG reductions Individual program workbooks are available in the 2019 Integrated Energy and Policy Report docket on energy efficiency and building decarbonization labeled A1 – A17, N18 – 22. And U1 – U10. California Utility Allowance Calculator California Utility Allowance Calculator (CUAC) The CUAC is a tool designed to calculate project-specific utility allowances for low income housing projects. Resources 2019 Residential Appliance Saturation Study Building Benchmarking: For Building Owners of Large and Commercial and Multifamily Buildings to Report Energy Use California Commercial End-Use Survey Clean Energy in Low-Income Multifamily Buildings Action Plan: Read About the Actions and Current Programs Doubling Energy Efficiency: Learn About 2030 Efficiency Targets Integrated Energy Policy Report: Learn About the Energy Commission’s Assessment of Major Energy Trends and Issues Low Income Barriers Study: Learn More About the Barriers to Energy Efficiency and Weatherization Investments Other Related Content Assembly Bill 758 Senate Bill 350 Assembly Bill 3232