SCE Plans Electrical Grid Upgrades In Diamond Bar Starting Nov. 13

DIAMOND BAR, CA — Southern California Edison (SCE) is planning electrical grid upgrades in southern Diamond Bar as part of its wildfire mitigation efforts, the city announced Thursday.

The project will include replacing existing bare electrical conductors with covered conductors designed to help reduce wildfire risks, the city said.

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Construction is scheduled to begin between Nov. 13 and Nov. 17, with work expected to be completed in December 2026.

The upgrades will take place in the following areas:

• Castle Rock Road, between Silver Bullet Drive and Gold Run Drive.
• Flapjack Drive.
• Crooked Creek Drive, between Gold Run Drive and Flapjack Drive.

Residents in the affected areas may experience temporary road closures, traffic delays, construction noise and possible power outages related to maintenance work, the city said.

Southern California Edison will notify affected customers and provide updates throughout the project, according to the city.

The city advised residents with questions or concerns to call SCE at 800-655-4555.