After California power company Edison seized property for an easement through eminent domain, "the city of Chino Hills sued Edison in 2010, claiming the company had “overburdened” the power line easements, but West Valley Superior Court Judge Keith D. Davis ruled the California Public Utilities Commission has exclusive jurisdiction regarding the route used by Edison and the suit was thrown out. Chino Hills appealed Davis’s ruling to the 4th District Court of Appeal, asserting the city had the right to have the case heard by a jury, but on September 12 the appeals court affirmed Davis’ decision, ruling that the California Public Utilities Commission and not the courts has exclusive jurisdiction over property rights issues between the city and Southern California Edison (SCE). That [failed] legal effort cost the city more than $2.3 million." 

Edison overestimated the cost of undergrounding the power line by hundreds of millions of dollars, and even threatened Chino Hills with an extra surcharge for only their city to prevent undergrounding.

A citizen effort, called Hope For The Hills and Chino Hills City Council had argued the 150 foot right-of-way through Chino Hills was too narrow for an overhead high voltage line, and that an overhead line would have negative health, safety, property value, and visual impacts.  Hope for the Hills noted that no other transmission line in the United States used such a narrow right of way in a seismically active residential community for a 500kV line. 

"A Hope For The Hills spokesperson said property values are already down roughly 17% since the project started, and health studies report increased risks of brain tumors, childhood leukemia, Lou Gehrig’s disease and miscarriage due to prolonged exposure to overhead power line electromagnetic fields.  Chino Hills City officials have already spent more than $2 million fighting Southern California Edison in a lawsuit over the right-of-way through the city being too narrow for the towers."  HFTH also argued that because their homes were located within the so-called "fall line" of the power line, the line limited their ability to receive loans or refinance their properties.

As part of the effort, they created a music video that includes an overlay of the noise emitted by 125 kV lines. 

Ultimately Chino Hills residents stopped power line construction, won their ruling with the CPUC, forced Edison to remove the already constructed monopoles, and undergrounded the line.

Here are more links about the project:

https://www.chinohills.org/1115/TRTP-Undergrounding - Chino Hills city website about the project

https://www.chinohills.org/1000/Tehachapi-Renewable-Transmission-Project - detailed timeline of the city's effort to fight for undergrounding 

https://www.chinohills.org/DocumentCenter/View/10137/TRTP-Undergrounding-Construction-Update-September-23-2014-PowerPoint - Powerpoint that shows pictures of the undergrounding project and what the construction map looked like.  Note that the entirety of the 3.5 mile route was undergrounded through the town.