SDG&E to Add More Storage to Improve Regional Reliability

New battery projects will be located at SDG&E substation sites      

SAN DIEGO, Aug. 18, 2016 – The California Public Utilities Commission (CPUC) today approved a proposal by San Diego Gas & Electric(SDG&E) to build two new energy storage projects in San Diego County. In May, the CPUC directed Southern California electric utilities to fast-track additional energy storage options to enhance regional energy reliability.

Adding storage resources improves the overall reliability of the grid as it allows the system to accommodate greater amounts of renewable power and helps to ease congestion. SDG&E proposes to charge the batteries during times when there is an abundance of solar or wind power and discharge them during the peak usage time in the early evening.

“We were in the process of a competitive solicitation for energy storage and already had completed a pre-evaluation of respondents,” said James P. Avery, SDG&E’s chief development officer. “As a result, we could move quickly to respond to the CPUC’s request for expedited proposals.”

In mid-July, SDG&E signed an agreement with AES for a total of 37.5 megawatts (MW) of lithium-ion battery storage. AES is a major supplier of advanced storage technology and other energy resources around the world.

SDG&E will own the storage projects that AES will build on utility-owned property in Escondido and El Cajon. The larger of the two will be a 30-MW unit and the smaller will be a 7.5- MW unit.

Construction will begin immediately and should be completed in early 2017.

The CPUC requires SDG&E to procure a total of 165 MW of energy storage by 2020, to be operational by 2024.

SDG&E is an innovative San Diego-based energy company that provides safe, reliable, clean energy to better the lives of the people it serves in San Diego and southern Orange counties. More than 4,300 employees work to provide the most reliable and clean energy in the West. The company has been recognized by the U.S. Environmental Protection Agency for leadership in addressing climate change, was the first to meet California’s goal of delivering 33 percent of energy from renewable sources, has fueled the adoption of electric vehicles and energy efficiency through unique customer programs, and supports more than 600 non-profit partners. SDG&E is a subsidiary of Sempra Energy (NYSE: SRE), a Fortune 500 energy services holding company based in San Diego. For more information visit or connect with SDG&E on Twitter (@SDGE), Instagram (@SDGE) and Facebook.

Previously published August 18, 2016.