How much will Title 24 save on my energy bill?

The Energy Commission publishes statewide estimates, not a per-home figure. Your design's result against the standard design is in its compliance report, and real use depends on how the building is operated.

Does the 2025 code save electricity or gas?

Both, by the CEC's estimate: about 392 GWh of electricity and 23 million therms of gas a year. Heat pump measures add electric load while cutting gas, so most of the electricity saving comes from other measures.

Where do these figures come from?

From the CEC's June 2025 overview of the 2025 Energy Code, its adoption announcement of 11 September 2024, and its March 2024 environmental study of the proposed amendments.

How Much Energy Does Title 24 Save?

The Energy Commission estimates that the 2025 Energy Code saves about 392 GWh of electricity and 23 million therms of gas a year statewide, and avoids about 4.1 million metric tons of CO2e. These are CEC projections for everything built and altered under the 2025 update, not a figure for any one building.

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The Energy Commission's figures for the 2025 code

The CEC's June 2025 overview of the code lists its benefits "by the numbers":

electricity savings of 392 GWh a year;
natural gas savings of 23 million therms a year;
water savings of more than 68 million gallons a year;
avoided greenhouse gas emissions of 4.1 million metric tons of CO2e;
a benefit-to-cost ratio of 7.

When it adopted the code on 11 September 2024, the Commission described the emissions cut over the code's lifetime as about 4 million metric tons, which it equated to the annual energy consumption of more than half a million homes. Its fact sheet calls the standards cost-effective, which the law requires over the life of the building.

Where the savings come from

The overview credits the solar and battery measures with about 300 GWh a year, and expects the heat pump measures to lead to more than 500,000 heat pumps being installed over three years.

The CEC's environmental study of the proposed amendments, published in March 2024, shows how uneven the picture is. Of 404 GWh of annual electricity savings it projected at that stage, nonresidential buildings supplied 385 and residential buildings 19. The single-family heat pump measure on its own had negative electricity savings, minus 73 GWh, because moving heating from gas to electricity adds electric load while it cuts gas use. The study also charged the heat pumps with more refrigerant leakage, worth about 15,000 metric tons of CO2e, and still put the net reduction at 177,000 metric tons a year.

Those earlier figures were for the proposal. Measures changed before adoption, which is why the June 2025 overview shows 392 GWh and 23 million therms rather than the study's 404 GWh and 35 million therms. Quote the adopted figures, and say where they came from.

Savings compared with what

These are the effects of one update, measured against the code it replaced, not the value of having an energy code at all. The study says so directly: its savings "represent the impact" of the 2025 amendments. Earlier cycles were reported the same way. The CEC's overview of the 2019 code put new low-rise homes at 7 per cent more efficient than under the 2016 standards, and nonresidential buildings at 30 per cent more efficient, mainly through lighting upgrades.

What it means for one building

Statewide totals do not translate into a figure for your project. The number that applies to a building is in its own compliance report. Under the performance approach, the software compares the proposed design with a standard design on source energy and long-term system cost, and the certificate shows the margin; a sample report shows where. Actual use then depends on how the building is run. For what changed in this cycle, see 2025 Energy Code changes.