A union worker installs imported lithium-ion batteries at a SDG&E energy storage project.

A union worker installs imported lithium-ion batteries at a SDG&E energy storage project. Photo by Jamie Scott Lytle.

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The battery storage project AES Corp. is building for San Diego Gas & Electric Co. in Escondido would normally take years to permit, contract, design and build. But thanks to accelerated work by both companies, and a state fast-tracking process, this one has taken just a few months, potentially pointing the way to rapid development of other projects.

— The nation’s largest battery storage facility consists mainly of two dozen white, shipping container-size buildings lined up next to an Escondido electrical substation...