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The California Public Utilities Commission (CPUC) has granted a request from the City of Chino Hills to put underground a segment of Southern California Edison's Tehachapi Renewable Transmission Project.

The CPUC agreed with the City's assertion that the design of the above-ground line "ignores community values and places an unfair and unreasonable burden on residents."

Currently, the 3.5-mile segment of the 500 kV transmission line running through Chino Hills consists of massive transmission towers reaching nearly 200 feet tall and set in a narrow 150-foot right of way. The CPUC's decision "rectifies that disproportionate burden and finds that it is in the public interest to construct an underground alternative based on a single circuit, two cables per phase design using cross-linked polyethylene cable."

It will cost approximately $224 million to underground the Chino Hills portion of the line.

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