Umair Gaines
California's electricity infrastructure has been developed over many years, with the state now holding the title of the nation's fourth-largest electricity producer. The state has a large and growing economy, with a $4.2 trillion GDP in 2024, and is home to one in nine US residents, making it the most populous state in the country. California has abundant renewable energy resources, including solar, hydroelectric, geothermal, and biomass, and it produces more electricity from renewable energy than any other state except Texas. The state has set ambitious targets for renewable energy, aiming for 100% clean energy by 2045, but this has been hampered by long permitting processes, community opposition, and high costs, which have slowed the development of new electrical infrastructure.
| Characteristics | Values |
|---|---|
| Electricity Sources | Natural gas, nuclear, utility-scale solar and wind, hydropower, small-scale customer-sited solar photovoltaic systems |
| Electricity Generation | 57% from renewables, 35% from natural gas, 7% from nuclear in 2024 |
| Electricity Consumption | More electricity than all states except Texas and Florida, but the third-lowest per capita energy use in the nation |
| Electricity Costs | 19.7 cents per kWh in 2021, double the nationwide average of 13 cents per kWh in 2025 |
| Electric Vehicle Adoption | Leads all states in EV adoption and charging locations since 2016, with about 1.2 million registered EVs in 2023 |
| Clean Energy Goals | Legislatively-mandated target of 100% clean energy by 2045 |
| Energy Infrastructure Challenges | Long permitting processes, community opposition, high costs, and transmission system backlog |
| Infrastructure Oversight | California Public Utilities Commission (CPUC) oversees utility electric and gas infrastructure, permitting, and policy |
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What You'll Learn
California's transition to clean energy
California has been a leader in the transition to clean energy. The state has implemented innovative climate policies and made significant investments in renewable energy sources, such as solar, hydroelectric, and geothermal power. In 2023, California achieved a historic milestone by generating 67% of its retail electricity sales from renewable and zero-carbon sources, making it the largest economy in the world to reach this level of clean energy. This remarkable progress has resulted from the state's consistent focus on increasing clean energy capacity and reducing greenhouse gas emissions.
Additionally, California has taken a proactive approach to addressing the challenges associated with its energy transition. The state has allocated funds for energy storage solutions and grid upgrades, recognizing the importance of balancing intermittent renewable energy sources with stable power supplies. California has also addressed the issue of high electricity costs by exploring alternative funding mechanisms to ensure that the transition to clean energy remains affordable for consumers. Furthermore, the state has implemented measures to improve energy efficiency, such as investing in public transit and promoting compact development patterns to reduce vehicle miles travelled (VMT).
The transition to clean energy in California has had far-reaching impacts. As of 2024, the state was the fourth-largest electricity producer in the nation and the second-largest producer of conventional hydroelectric power. California's progress in clean energy has also contributed to a significant reduction in greenhouse gas emissions, with a 20% decrease since 2000. This achievement is even more remarkable considering that the state's GDP grew by 78% during the same period. By successfully navigating the complexities of its energy transition, California has demonstrated its commitment to addressing climate change and building a sustainable future.
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The role of Berkeley engineers
California has the largest economy in the US, with a GDP of $4.2 trillion in 2024, and is the most populous state. It has the fourth-largest electricity production in the US and is the second-largest importer of electricity. The state has abundant renewable energy resources, including solar energy, hydroelectric power, geothermal energy, and biomass.
California's growing economy and industries turned to Berkeley engineers for help in building the state's early energy infrastructure. Clarence L. Cory taught the first electrical engineering courses at Berkeley to meet California's growing demand for electricity.
Berkeley engineers played a crucial role in the development of California's early energy infrastructure. They helped design and implement the state's power grid, including the iconic Vaca-Dixon substation, which was built during a period of large-scale investment in California's energy infrastructure and remains a critical piece of the grid, powering homes across the Bay Area.
As California continues to invest in renewable energy sources, Berkeley engineers remain at the forefront of the state's energy transition. They are involved in research and development, policy-making, and the design and implementation of new energy infrastructure. For example, the Electricity Markets & Policy Group at Berkeley Lab is working to understand the challenges of the renewable energy transition, such as the inefficiencies in the transmission system that have led to backlogs and delays in bringing new renewable energy sources online.
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The state's renewable energy resources
California has been a leader in renewable energy in the United States. The state has abundant renewable energy resources, including solar energy, hydroelectric power, geothermal energy, and biomass. In 2024, California was the nation's fourth-largest total electricity producer, and renewable resources supplied 57% of California's total in-state electricity generation.
California has made significant strides in the adoption of renewable energy sources. In 2019, 63% of the state's power came from carbon-free sources, including renewables, hydropower, and nuclear. The state has also experienced a record-breaking string of days where the combined generation of wind, geothermal, hydroelectric, and solar electricity has exceeded demand on the main electricity grid. In 2022 and 2023, California reached 100% renewable energy on the grid during certain periods, and this has become an almost daily occurrence during the spring.
The state has also led the nation in the adoption of electric vehicles (EVs). California has the second-highest rate of plug-in cars in the world, making up half of the electric car market in the US. The state has also established programs like the California Electric Vehicle Infrastructure Project (CALeVIP) to build more chargers and support the growing number of electric vehicles.
Despite these achievements, California still faces challenges in its transition to renewable energy. The state has some of the highest electricity prices in the nation, and managing the transition from fossil fuels to renewables remains a complex task. California is addressing this challenge by developing large battery projects to store energy generated during the day for use at night. Additionally, the state is exploring projects to capture carbon emissions and make natural gas projects more like carbon-free power sources.
California's progress in renewable energy is significant, and the state continues to work towards its long-term goals of achieving 100% clean energy and reducing its reliance on fossil fuels. The state's success serves as a model for other states and countries transitioning to renewable energy sources.
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Electric vehicle infrastructure
California has the largest economy in the US, with a GDP of $4.2 trillion in 2024, and is the most populous state. It has large energy resources and is the fourth-largest electricity producer in the nation. The state has led the US in the number of electric vehicles (EVs) and EV charging locations every year since 2016. In 2023, California had about 1.2 million registered battery electric vehicles, the most of any state and more than one-third of the US total.
California has abundant renewable energy resources, including solar energy, hydroelectric power, geothermal energy, and biomass. The state produces more electricity from renewable energy than any other state except Texas. It is also the top producer of electricity from solar and geothermal energy.
The California Energy Commission (CEC) is investing in the charging infrastructure and technologies that are helping to drive the transition to clean, zero-emission electric vehicles throughout the state. The CEC invests up to $100 million annually in a broad portfolio of transportation and fuel transportation projects throughout the state. The California Electric Vehicle Infrastructure Project (CALeVIP) is a more than $500 million investment in EV charging, funded by the CEC, with additional contributions from county air districts, community choice aggregators, and other organizations. CALeVIP offers substantial incentives for publicly available EV chargers, including charging equipment, planning, installation, and other eligible costs. Property owners, contractors, businesses, and California Native American tribes can apply.
California has set ambitious goals for the adoption of zero-emission vehicles (ZEVs). The state aims to have 1.5 million ZEVs on the road by 2025, 5 million by 2030, and 100% of all in-state sales of zero-emission passenger cars and trucks by 2035. To support these goals, the CEC is investing in the infrastructure and technologies needed to charge electric vehicles. The state has about 16,800 public charging locations and is part of the West Coast Green Highway, a network of electric vehicle DC fast-charging locations along Interstate 5.
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The impact of wildfires
California has long experienced wildfires, but in recent decades, the number of fire incidents and acres burned has increased significantly. This is due to a combination of factors, including land use and resource management policies, as well as climate change, which have increased the likelihood of wildfires igniting and the speed at which they spread.
Wildfires in California have had a significant impact on the state's electrical infrastructure. The state imports the second-largest amount of electricity, and wildfires threaten both imports and transmission within the state. Electric utility infrastructure is one potential cause of wildfires, with power lines being able to start fires in several ways. For example, a power line can break in the wind, or when a tree or branch falls across it, causing sparks and hot metal particles that can start a fire on the ground. Between 2016 and 2020, electrical power networks caused 19% of wildfires, and they have consistently been among the top three major causes of California wildfires.
To mitigate the impact of wildfires on electrical infrastructure, utilities must report any fire involving their equipment to the CPUC, and the Wildfire Safety Enforcement Branch investigates all wildfires involving investor-owned utility equipment. The Office of Energy Infrastructure Safety is the primary state agency responsible for reducing the likelihood of utility-involved wildfires. Additionally, utility companies are taking proactive steps to mitigate wildfire risks, such as improving vegetation management and infrastructure maintenance. Undergrounding power lines is another option, but the high cost of doing so can be impractical, and the matter is regulated by the Public Utilities Commission to protect consumers and the environment.
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Frequently asked questions
The California Public Utilities Commission (CPUC) is responsible for the oversight of utility electric and gas infrastructure. The CPUC also has a significant role in permitting transmission and substation facilities.
California has a legislatively-mandated target of 100% clean energy by 2045. In 2024, 57% of California's total in-state electricity generation came from renewable resources.
Years-long permitting processes, community opposition, and high costs can result in delays in building new electrical infrastructure.
