The California Public Utilities Commission July 2 inched closer to requiring Southern California Edison to remove and place underground part of the yet-to-be completed Tehachapi transmission line running through Chino Hills. In a ruling, commission president Mike Peevey ordered Edison to prepare testimony in a proceeding aimed at settling a dispute between the city and Edison over the new 500 kV line, which towers above homes and businesses in the bedroom community east of Los Angeles. Edison, by Feb. 28, 2013, is to provide preliminary engineering studies on running the line underground through Chino Hills. Peevey said the ruling is aimed at developing details about the environmental impact and cost of \u201cputting this line underground in Chino Hills.\u201d Preliminary estimates--absent engineering assessments--pegged the cost of dismantling the portion of the segment that\u2019s been built and placing it underground at up to $1 billion (Current, March 2, 2012). The ruling came after the commission ordered Edison to halt construction work on the line in Chino Hills earlier this year, which prompted the utility and city to enter settlement negotiations on the dispute May 3. In a statement, the city of Chino Hills said it supported the ruling and would work toward a speedy resolution of the dispute so as not to delay completion of Edison\u2019s overall transmission project, of which the segment through its jurisdiction is just a part. \u201cWe will comply with the commission\u2019s order to file testimony regarding undergrounding options for transmission lines running through the City of Chino Hills,\u201d the company said in a statement. The overall project--known as the Tehachapi Renewable Transmission Project--is intended to deliver up to 4,500 MW of renewable power to Southern California, largely from wind power projects in the Tehachapi Mountains. When it\u2019s finished it\u2019s to run 173 miles from the mountains into western Riverside County.