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2025 Cycle Impacts

 

Thank you to all who contributed to the 2025 code cycle development process. The resulting code changes will provide significant energy savings to Californians. Below are the estimated impacts of Codes and Standards Enhancement (CASE) initiative efforts by type of energy, code cycle year, building type, construction type, system, and measure.

 

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First-Year Savings

Impacts by Code Cycle

Electricity Savings

Natural Gas Savings

Peak Demand Reduction

GHG Savings

First-Year Savings

Gas & Electricity Savings

Gas:
24 MMTherms

Electricity:
301 GWh

equivalent to the annual electricity usage of

41,539 homes

Peak Demand Reduction

57 MW

equivalent to

0.5 of the capacity
met by an average
peaker plant in CA

GHG Savings

150,413
metric tons of CO2e

equivalent to the carbon sequestered by planting

2,487,092 trees

Equivalencies calculated using data and assumptions provided by the Environmental Protection Agency and the California Energy Commission Energy Assessments Division.

Impacts by Code Cycle

First-year statewide natural gas savings, electricity savings, and peak demand reduction for 2016, 2019, 2022, and 2025 code cycles. The savings from 2016-2022 are based on CEC’s impact analysis and reflect savings associated with all measures (including CASE Team led measures, CEC-led measures that the CASE Team supported, and CEC led measures); however, 2025 savings reflect only measures that were supported by California investor-owned utilities (IOUs), because CEC has not yet completed 2025 impacts analysis.

Natural Gas First-Year Savings by Code Cycle

Chart showing Natural Gas Savings (MMTherms) per year. 26 Million Therms were saved in 2016; 0 in 2019; 14 Million in 2022, and 24 Million in 2025.

Electricity First-Year Savings by Code Cycle

Chart showing Electricity savings (GWh) through the years. 527 GWh were saved in 2016; 1,419 GWh in 2019; 1,565 GWh in 2022; and 301 GWh in 2025.

First-Year Peak Demand Reduction by Code Cycle

Chart showing Peak Demand Reduction (MW) through the years. 272 MW reduced in 2016; 353 MW in 2019; 123 MW in 2022; and 57 MW in 2025.

Electricity Savings by Category

Electricity Savings by Building Type (GWh)

A pie chart showing electricity savings by building type. Nonresidential buildings saved 233 GWh, composing 77% of the chart; single family buildings saved 54 GWh, composing 18%; and Multifamily buildings saved 14.5%.

Electricity Savings by Construction Type (GWh)

A pie chart showing electricity savings by construction type. Alterations saved 201 GWh, composing 67% of the chart, and New Construction & Additions saved 100 GWh, composing 33%.

Electricity Savings by System (GWh)

Electricity Savings by Top 10 Measures (GWh)

A bar graph showing electricity savings in GWh by the top 10 measures. Horticulture Lighting Efficacy saved 99 GWh; Guideline 36 saved 44.45; Optimal and Verified Sizing (Design) saved 34; Revise Automatic Daylighting Controls Exceptions saved 27.81; Reheat Limitation saved 15.9; Windows/Fenestration saved 12.29; Reduced Infiltration Vestibules (Thermal Bridging) saved 10.41; Defrost saved 9.59; ACH Setbacks saved 6.7; Supplemental Heating Combined saved 6.6;

Read more about these measures

Natural Gas Savings by Category

Natural Gas Savings by Building Type (MMTherms)

A pie chart showing natural gas savings (MM Therms) by building type. Nonresidential saved 18.5 MM Therms, composing 77% of the chart; Single family saved 4.2 MM Therms, composing 18%; and Multifamily saved 1.1 MM Therms, composing 5%.

Natural Gas Savings by Construction Type (MMTherms)

A pie chart showing natural gas savings (MM Therms) by construction type. Alterations saved 15.8 MM Therms, composing 67% of the chart; New Construction & Additions saved 7.93 MM Therms, composing 33%.

Natural Gas Savings by System (MMTherms)

A bar chart showing Natural Gas savings (MM Therms) by measure type. Covered processes saved 14 MM Therms, Water heating saved 6 MM, and HVAC saved 3 MM.

Natural Gas Savings by Top 10 Measures (MMTherms)

A bar chart showing natural gas savings (MM Therms) by the top 10 measures. ACH Setbacks saved 5.53 MM; Process Load Pipe Insulation and Verification saved 5.47 MM; Solar Pool Heating - Residential saved 4.06 MM; Limit Hot Water Supply Temperatures (Gas) saved 2.66 MM; Reheat Limitation saved 2.37 MM; Heat Recovery saved .76 MM; Guideline 36 saved .7 MM; Solar Pool Heating - Nonresidential saved .68 MM; DHW Pipe Insulation Enhancement saved .42 MM; and DHW Master Mixing Valves saved .31.

Read more about these measures

Peak Demand Reduction by Category

Peak Demand Reduction by Building Type (MW)

A pie chart showing Peak Demand Reduction (MW) by Building Type. Nonresidential saved 48 MW, composing 84% of the chart; Single family saved 7 MW, composing 12%; and Multifamily saved 2 MW, composing 4%.

Peak Demand Reduction by Construction Type (MW)

A pie chart showing Peak Demand Reduction (MW) by construction type. Alterations saved 40 MW, composing 70%; and New Construction & Additions saved 17 MW, composing 30%.

Peak Demand Reduction by System (MW)

Peak Demand Reduction by Top 10 Measures (MW)

A bar chart showing Peak Demand Reduction (MW) by top 10 measures. Guideline 36 saved 38.8 MW; Horticulture Lighting Efficacy saved 5.57 MW; Defrost saved 3.39 MW; Reheat Limitation saved 1.42 MW; Supplemental Heating Combined saved 1.4 MW; High-Performance Windows saved 1.15 MW; ACH Setbacks saved .86 MW; Refrigerant Charge Verification saved .8 MW; Limit Hot Water Supply Temperatures (Electric) saved .77 MW; and DHW Master Mixing Valves saved .38 MW.

Read more about these measures

GHG Savings by Category

GHG Savings by Building Type (metric tons of CO2e)

A pie chart showing GHG Savings by Building Type (metric tons (t) of CO2e). Nonresidential saved 112,193 t, composing 75%; Single family saved 30,126 t, composing 20%; and Multifamily saved 8,094 t, composing 5%.

GHG Savings by Construction Type (metric tons of CO2e)

A pie chart showing GHG Savings by Construction Type (metric tons (t) of CO2e). Alterations saved 97,518 t, composing 65%; New Construction & Additions saved 52,895 t, composing 35%.

GHG Savings by System (metric tons of CO2e)

A bar chart showing GHG Savings by System (metric tons of CO2e). Covered Processes saved 86,629t; Water Heating saved 34,968t; HVAC saved 23,107t; Envelope saved 4,919t; and Lighting saved 790t.

GHG Savings by Top 10 Measures (metric tons of CO2e)

A bar chart showing GHG Savings by Top 10 Measures (metric tons of CO2e). ACH Setbacks saved 30,866t; Process Load Pipe Insulation and Verification saved 30,008t; Solar Pool Heating - Residential saved 24,368t; Limit hot Water Supply Temperatures (Gas) saved 14,574t; Reheat Limitation saved 14,208t; Horticulture Lighting Efficacy saved 7,014t; Solar Pool Heating - Nonresidential saved 3,719t; Guideline 36 saved 2,729t; and DHW Pipe Insulation Enhancement saved 2,637.

Read more about these measures

Data updated on 05/21/2025

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