CEERT Reports

California’s Path to Decarbonization


March 2023



Earlier this year, the Center for Energy Efficiency and Renewable Technologies (CEERT) released a report, “Transmission in California”, on the need to build new high voltage transmission projects and upgrade existing transmission lines and substations in order to make substantial progress in the near and medium term in decarbonizing California’s electric system and the economy.

This report noted three important trends that have increased opportunities to accelerate decarbonization of California’s grid and economy—first, the rapid decline in costs of clean energy technologies; second, the improved recognition of suitable geographical locations where clean energy technologies can be sited; and third, the increase in electric load expected from the electrification of transportation, heating, and other end uses.

The enactment of the Inflation Reduction Act by Congress with sustained tax incentives for clean energy technologies has resulted in a surge of interest among investors and renewable energy project developers about opportunities in California. This interest can be observed by the flood of interconnection applications that have been submitted in the CAISO’s Cluster 14 and Cluster 15 application periods.

The Cluster 15 window, which closed on April 16, 2023, resulted in 546 new interconnection applications. This quantity exceeded the so-called Supercluster 14, which had 373 applications (a 46% increase). There are currently over 530 GW of interconnection applications in the CAISO queue; an order of magnitude more than is required to meet California’s needs.

Through coordinated efforts, California’s energy policymakers have created the conditions that encourage a high-level of interest in building and operating clean energy resources that will help the State meet its greenhouse gas (GHG) reduction goals. However, California will need to continue to make sustained efforts to ensure that sufficient transmission capacity is permitted and built in a timely manner to leverage this competitive market, and that feasible alternatives also be considered so that the failure to build one project does not result in a failure to achieve the desired capability expansion in a specific planning horizon. Delays in upgrading the transmission system will create irreversible lost opportunities for clean energy development as the need for decarbonization becomes ever more urgent.

(Read Full Report)



November 21, 2017 Global Warming Data, Trend and Forecast - November | Dr. Rich Ferguson, CEERT - (pdf)

October 18, 2017 Global Warming Data, Trend and Forecast - October | Dr. Rich Ferguson, CEERT - (pdf)

September 12, 2017 CEERT Quarterly Staff Report | May – August 2017 - (pdf)

September 19, 2017 Global Warming Data, Trend and Forecast - September | Dr. Rich Ferguson, CEERT - (pdf)

August 23, 2017 SB 100: Renewable and Zero‐Carbon Electricity for California | Union of Concerned Scientists - (pdf)

August 18, 2017 Global Warming Data, Trend and Forecast - August | Dr. Rich Ferguson, CEERT - (pdf)

July 20, 2017 Global Warming Data, Trend and Forecast | Dr. Rich Ferguson, CEERT - (pdf)

June 29, 2017 CEERT Quarterly Staff Report | January – April 2017 - (pdf)

June 23, 2017 Global Warming Data, Trend and Forecast | Dr. Rich Ferguson, CEERT - (pdf)

May 22, 2017 Global Warming Data, Trend and Forecast | Dr. Rich Ferguson, CEERT - (pdf)

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