2025 California Green Innovation Index 17th edition

California Green Innovation Index

The 17th annual California Green Innovation Index is primarily digital, allowing readers to learn and interact with the findings of the report and dive even deeper into the data through interactive charts. This year’s data shows that there has been a 23.3% drop in greenhouse gas emissions since AB 32 was passed in 2006, including steep cuts in transportation, industrial, and power sector pollution.

The report finds total greenhouse gas emissions fell between 2022 and 2023, dropping by 3.0% to 360.4 million metric tons of carbon dioxide equivalent (MMTCO₂e), an improvement over the 2.4% reduction the previous year. Notably, emissions in 2023 were also 2.4% lower than they were during the COVID-19 pandemic shutdown in 2020. Most of the decrease in emissions came from the transportation sector, which fell by 4.6% from 2022 to 2023 (Figure 1). This was driven by a significant 17.2% decrease in emissions from the heavy-duty vehicles sub-sector, while emissions from light-duty vehicles also fell by 0.6%.

Within the transportation sector, California met the 2025 goal of 1.5 million zero-emission vehicles (ZEVs) on-road two years early in April 2023. To reach the 2030 goal of 5 million ZEVs on-road, ZEV registrations in California need to increase by an annual average of 17.5% from 2025 to 2030, revised downwards from the 18.6% required previously between 2024 to 2030 (Figure 21). However, now that the $7,500 tax credit for new EVs and the $4,000 tax credit for used EVs are no longer available as of October 1st, new registrations of EVs may slow compared to historical trends and threaten the state’s ability to meet the 2030 goal. In 2024, new battery electric and plug-in hybrid vehicles accounted for 25.5% of total new vehicles registered in California and the percentage of registered vehicles on-road that are ZEVs reached 6.5%, up from 5.2% in 2023. The Index’s encouraging data on electric vehicle sales contrasts sharply with its findings on public transit ridership, which remained 23.2% below the pre-pandemic 2019 level in 2024, despite a 9% increase in ridership from 2023 to 2024.

California is not currently on track to meet the 2030 emissions target of nearly 260 MMTCO₂e (or 40% below 1990 levels) on time. To do so, California would need to reduce emissions by 4.4% annually on average as of 2023 — up from the 4.2% needed in 2022 and the 4.0% needed in 2021 (Figure 4). Over the most recent five-year period (2019 to 2023), emissions have only decreased by 2.8% annually on average. Using this trajectory, the state would meet the 2030 goal in 2035. Even if the state met the 2030 goal on time, emissions would need to fall at a pace of 8.8% per year to reach the goal by 2045—more than double the pace required to meet the 2030 target. However, using the recent five-year average annual reduction of 2.8%, emissions would need to decrease by 9.5% on average each year from 2030 to 2045 to meet the 2045 goal on time.

Since the passage of AB 32 in 2006, emissions have fallen significantly in most sectors, highlighting the impact of that historic legislation (Figure 3). The largest decrease has been from electric power generation where emissions have fallen by 45.3% Within the sector, emissions from in-state generation have fallen by 17.4% while emissions from imports have decreased significantly by 70.9%. The next biggest decrease was in the transportation sector where emissions have fallen by 26.7%, driven by a 45.3% decrease in emissions from heavy-duty vehicles as they use an increasing share of biodiesel. For light-duty vehicles, emissions have fallen by 20.5%. The residential and commercial sectors are the only ones in which emissions have increased — by 13.0% and 43.9%, respectively. The increases can be partially attributed to the increasing use of substitutes for ozone-depleting substances for refrigeration and air conditioning which emit high global warming potential (GWP) gases.

Renewable energy generation increased by 4.4% from 2023 to 2024, a welcome change after growth had been fairly stagnant since 2018, to 41.3% of California’s total power mix (imports and in-state but excluding large hydro) (Figure 29). While this is good news, the state missed the interim SB 100 goal of procuring 44% of retail electricity sales from RPS-eligible renewable sources by the end of 2024. However, if California can maintain this 4.4% pace it could meet the 2026 goal of 50% of generation from RPS-eligible renewable sources on time (Figure 33). For the first time, electricity generation from RPS-eligible renewable sources and large hydroelectric in 2024 accounted for over half (52.3%) of the power mix. Meanwhile, generation from fossil fuels fell to 36.3% in 2024 — the lowest on record. Solar and wind are the largest renewable sources, making up 21.3% and 11.9%, respectively, of the state’s total power mix (Figure 31a&b).

While growth in renewable energy generation has fallen short of our targets, the state has brought online a substantial amount of battery storage and very little new natural gas generation. In 2024, California added 5,743 MW of energy storage, an increase of 69.2% compared to the addition of 3,394 MW in 2023. California had also already added more storage in the first three months of 2025, adding 7,272 MW to the grid, than in all of 2024 (Figure 39). As of the end of 2024, California had 8,551 MW of proposed energy storage capacity in the pipeline for 2025 to 2027, which is more than the cumulative capacity added from 2013 to 2023 (7,913 MW). Meanwhile, the state added nearly 3,000 megawatts (MW) or 3 gigawatts (GW) of solar to the grid in 2024 and only 55 MW of natural gas. From 2015 to 2024, the state has retired 10.3 GW of natural gas plants while adding 34 GW of utility-scale solar to the grid (Figure 32).

Increasing renewable energy and battery storage deployment have led to significant decreases in emissions from the electric power sector. From 2022 to 2023, emissions from electric power generation fell by 4.2%, driven by a 9.3% reduction in emissions from imports while those from in-state generation of electricity fell by 2.1%. In 2024, imports supplied 25.4% of California’s RPS-eligible renewable energy, with 9.4% from the Northwest and 16.0% from the Southwest. The share of Northwest imports that are from RPS-eligible renewables remained elevated at 68.5% in 2024 compared to 67.5% in 2023 and just 30.0% in 2022, while the share from the Southwest rose from 33.8% in 2023 to 39.7% in 2024 (Figure 30). Continued investment in renewable energy and battery storage coupled with the new regional electricity market that will enable California to share clean energy resources with neighbors across the West should help to further decarbonize electricity generation in California. California already maintains a significant lead in renewables, with an average yearly growth rate of 1.9% from 2008 to 2024, compared to the 0.9% growth rate in the rest of the U.S.

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