Beatrice Lang
California has some of the most ambitious renewable energy goals in the United States, aiming to obtain at least 33% of its electricity from renewable sources by 2020 and 50% by 2030. The state has made significant progress towards these goals, with renewable energy sources accounting for 54.2% of total generation in 2022. However, California has faced challenges in meeting its energy demands, particularly during periods of extreme weather, due to various factors such as inadequate preparation for heatwaves, sequencing errors in the shift to renewable energy, and the intermittent nature of renewable sources. The state has about 87,750 MW of installed electric generation capacity, with natural gas-fired power plants contributing the largest share. California's energy landscape is further complicated by its reliance on electricity imports, which account for approximately 30% of its total system electric generation.
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What You'll Learn
California's energy imports and exports
California has some of the most ambitious renewable energy goals in the United States. The state is required to obtain at least 33% of its electricity from renewable resources by 2020, and 50% by 2030, excluding large hydro. In 2019, California's net electricity imports were the largest in the country at 70.8 million megawatt-hours (MWh), or 25% of the state's total electricity supply. California imports about 6% of its electricity from out-of-state coal-fired power plants, with another 14% coming from "unspecified imports", generally attributed to hydropower, gas, nuclear, and other renewables. California's single remaining operational nuclear facility is the Diablo Canyon Power Plant, which provides 2,400 MW (2.7%) of the state's capacity. California's imports come from two geographical regions: the Northwest and the Southwest.
California's electricity exports include hydroelectric power from the Pacific Northwest, transmitted via high-voltage transmission lines to Los Angeles. California also exports electricity to Mexico. California's wholesale power markets are relatively open, and electricity generated outside the state is often cheaper. However, California has the most expensive electricity west of the Mississippi River, and the least reliable, with nearly 470 power outages a year.
California has around 87,750 MW of electric generation capacity across more than 1,600 power plants. Natural gas-fired power plants make up the largest share of capacity at 39,689 MW (45% of the state total). Total renewable generation capacity is 37.5%, with solar contributing 24% and wind 7%. Large hydroelectric power plants provide an additional 12,281 MW (14%) of capacity.
California's imports and exports of electricity are impacted by its renewable energy goals and the availability of resources such as solar and wind power. The state's energy mix includes both in-state generation and imports from the Northwest and Southwest regions.
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The state's renewable energy goals
California has some of the most ambitious renewable energy goals in the United States. The state is leading the nation towards a 100% clean energy future, with a target of 100% zero-carbon energy by 2045. California has already made significant progress in transitioning to an economy powered by clean energy, with many of its clean energy targets being met ahead of schedule. The state has abundant renewable energy resources, including solar energy, hydropower, geothermal energy, and biomass, and it produces more electricity using renewable energy than any other state except Texas.
California's renewable energy goals are administered by the California Energy Commission, which jointly manages the state's Renewables Portfolio Standard (RPS) with the California Public Utilities Commission. The RPS requires electric utilities and other load-serving entities to procure increasing amounts of renewable energy to meet customer demand. The Energy Commission also implements California's Power Source Disclosure Program, which requires electricity suppliers to provide customers with simple and accurate information about the mix of generation resources used to produce their electricity.
The state has made remarkable strides in renewable energy development. In 2023, California was the nation's second-largest conventional hydroelectric power producer, and it consistently ranks among the top four hydropower producers. Hydropower generation increased by more than 80% from 2022 to 2023 due to favourable weather conditions. Non-hydroelectric renewable resources, primarily solar and wind energy, provided 41% of California's total in-state electricity generation in 2023. The state has also seen significant growth in the adoption of battery energy storage systems, with over 45,000 behind-the-meter systems installed in 2023 alone.
California's agricultural sector is also playing a vital role in the state's renewable energy goals. The Energy Commission's Renewable Energy for Agriculture Program provides grants to agricultural operations to install onsite renewable energy projects, reducing operational costs, increasing energy reliability, and lowering greenhouse gas emissions.
To achieve its renewable energy goals, California has set specific targets. The Global Warming Solutions Act of 2006 aimed for 33% of the state's electricity consumption to be generated by renewable sources by 2020. In 2015, SB350 mandated that electric utilities purchase 50% of their electricity from renewable sources by 2030. California's commitment to a 100% clean energy future by 2045 demonstrates its leadership in the transition to a sustainable energy economy.
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Nuclear power plants
California has a large and growing population, a flourishing economy, and a major high-technology sector. As a result, electricity demand has been steadily increasing over the years. In 2000-01, California experienced an acute electricity supply crisis, and another crisis occurred in 2020.
Nuclear power accounted for about 10% of California's total electricity supply in 2021. Diablo Canyon, located in San Luis Obispo County, is California's last operating nuclear power plant, and it supplied over 8% of California's electricity in 2021. The remaining nuclear electricity supply was imported from the Palo Verde Generating Station in Arizona and the Columbia Generating Station in Washington.
Palo Verde is the largest nuclear power plant in the United States, with three nuclear reactors built in the late 1980s. The plant has a combined capacity of 3.8 GW and supplied 34% of California's total nuclear electricity supply in 2021. The Columbia Generating Station is the Northwest's only commercial nuclear power facility, with a capacity of 1.8 GW, and it supplied 2% of California's nuclear electricity in 2021.
California's nuclear power generation has decreased over the years. The state used to have multiple nuclear power plants, but all except Diablo Canyon have been shut down due to economic and social factors. Diablo Canyon has two operating pressurized water reactor units, with a combined generating capacity of 2.2 GW. The plant employs about 1,500 workers and produces enough electricity to support more than 3 million people.
California imports more electricity than any other state, with about 30% of its supply coming from outside the state in 2020 and 2021. The state has some of the most aggressive renewable energy goals in the nation, aiming for 33% of its electricity from renewable resources by 2020 and 50% by 2030. To address shortfalls in electricity supply, the California Public Utilities Commission has authorized the procurement of new capacity from preferred resources, including renewables and zero-emitting sources.
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Solar power plants
California has been facing electricity shortages due to inadequate preparation for heatwaves, sequencing errors in the shift to renewable energy, and market mechanisms that allow power export during shortages. The state has been transitioning to renewable energy sources, with solar power being a key component.
California is home to some of the world's largest solar power plants, with the Riverside East Solar Energy Zone being a crucial component of the US green energy revolution. This zone spans 150,000 acres, showcasing the state's commitment to solar energy.
The state has various solar power plants, including the Solar Energy Generating Systems (SEGS) in the Mojave Desert, comprising nine solar power plants with a combined capacity of 354 MW. The Ivanpah Solar Power Facility, also in the Mojave Desert, generates 392 MW, while the Desert Sunlight Solar Farm in Riverside County produces 550 MW.
Other notable solar power plants in California include the Imperial Valley Solar Project (99 MW), California Valley Solar Ranch (250 MW), Mount Signal Solar Project (265.7 MW), Topaz Solar Farm (550 MW), Desert Stateline Solar Facility (300 MW), California Flats Solar Project (280 MW), and the San Pablo Raceway Solar Plant (100 MW).
California has also mandated the installation of rooftop solar panels on new homes, further increasing its solar energy capacity. The state offers incentives and subsidies for solar installations, including property tax exemptions, cash incentives, and streamlined permitting.
The state's solar power capacity is expected to increase by over 20,000 MW in the coming years, solidifying its position as a leader in renewable energy.
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Heat waves and drought conditions
California, the most populous state in the US, has one of the world's most volatile climates. The state has been grappling with the impacts of human-induced climate change, including drought, wildfires, and extreme weather.
Heatwaves in California have had devastating consequences, with the 2006 heatwave causing over 600 deaths, 16,000 emergency department visits, and nearly $5.4 billion in damages. Scientists predict that rising temperatures will bring more frequent and intense heatwaves, with mortality risks for those aged 65 and older potentially increasing tenfold by the 2090s. The state's unique landscape and coastal setting also influence warming patterns, with some heatwaves becoming increasingly humid and resulting in warmer nighttime temperatures.
Drought conditions in California are expected to worsen with rising temperatures. According to tree ring data and other paleoclimate evidence, the Southwest region, which includes California, is prone to megadroughts that can last for decades. As temperatures rise, more moisture evaporates from plants and soil, leading to prolonged seasonal dryness and reduced water availability. This, in turn, impacts hydropower production and increases the reliance on fossil fuels, contributing to higher greenhouse gas emissions.
The energy landscape in California is diverse, with natural gas-fired power plants contributing the largest share of capacity, followed by renewable sources such as solar and wind power. The state has set ambitious goals for renewable energy, aiming for 33% of electricity consumption to be generated by renewable sources by 2020 and 50% by 2030. However, the intermittent nature of renewables and the cost of installing sufficient infrastructure present challenges. California also imports approximately 30% of its electricity from other Western states and Canadian provinces, and experts suggest that additional grid connections could allow the state to export excess renewable energy and improve energy sovereignty.
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Frequently asked questions
California has approximately 87,750 MW of installed electric generation capacity across the state, with more than 1,600 power plants. As of 2018, California had 80 GW of installed generation capacity.
Natural gas-fired power plants make up the largest share of capacity at 39,689 MW (45% of the state total). Total renewable generation capacity is 32,925 MW (37.5% of the state total). California also has some nuclear power plants, although only one remains operational.
California has some of the most aggressive renewable energy goals in the United States. The state is required to obtain at least 50% of its electricity from renewable resources by 2030. However, researchers have estimated that the state will still need between 17 and 35 GW of natural gas-fueled capacity in 2050 to ensure resource adequacy.
California has experienced above-average temperatures and drought conditions in recent years, impacting hydroelectric generation. Electricity imports account for approximately 30% of total system electric generation, and there are concerns about losing sovereignty over the state's electricity supply if more grid connections are established with other states.
