The library

Link

Primary documents first. Each entry says what it is and why it matters, so you can cite the source rather than a summary of it.

The official record

What the regulators and the grid operator have published.

Golden Pacific Powerlink project page
California Public Utilities Commission
The CPUC's environmental review page. Notices and the application will post here.
Opportunities for Public Participation in Golden Pacific Powerlink Project
California Public Utilities Commission
The CPUC's own guide to every way the public can take part.
CPUC staff answers to the City of Temecula on the review process
California Public Utilities Commission, via the City of Temecula, June 17, 2026
CPUC staff explain the 2025 review rules, including the presumption of need.
Imperial Valley - North of SONGS project: approved project sponsor selection report
California Independent System Operator, May 9, 2024
How CAISO chose the original builder, with the cost and length figures.
Update to the Imperial Valley - North of SONGS approved project sponsor
California Independent System Operator, August 29, 2025
CAISO approves the line passing to SDG&E in 2025.
Decision 08-12-058, Sunrise Powerlink (A.06-08-010)
California Public Utilities Commission, December 18, 2008
The Sunrise Powerlink decision: all routes through Anza-Borrego found unacceptable.
Decision 18-07-025, SDG&E 2007 wildfire cost recovery (A.15-09-010)
California Public Utilities Commission, July 12, 2018
The CPUC on SDG&E's 2007 fires and its refusal to pass the costs to customers.
Board of Directors special meeting packet, October 14, 2026
Vista Irrigation District, October 14, 2026
The water district's analysis, a draft resolution, and its August letter to Supervisor Desmond.

SDG&E's own materials

The proponent's case, in its own words.

Golden Pacific Powerlink
SDG&E
Project site with the interactive route map.
Golden Pacific Powerlink fact sheet (November 2026)
SDG&E
Two-page summary and contact details.
Frequently asked questions
SDG&E
Who pays, what it carries, and SDG&E's answers on fire.
Online open house
SDG&E
Open house boards, including magnetic field figures and the undergrounding analysis.
Open house information, August 26, 2026
SDG&E, via the City of Temecula, August 26, 2026
The August deck naming the three alternative routes.

Maps

No official GIS file of the route has been published yet. These are the best available images.

Project vicinity map (preliminary route, no alternatives)
SDG&E
SDG&E's preliminary route, without alternatives.
SDG&E's proposed route and alternatives (overview map)
Anza-Borrego Foundation
The preliminary route with SDG&E's alternatives, hosted by the Anza-Borrego Foundation.
Alternative route map proposed by SDG&E
City of Temecula
SDG&E's alternative route map, hosted by the City of Temecula.

Community toolkits

Resources from groups already in this fight.

Advocacy toolkit
Anza-Borrego Foundation
Talking points and action steps from the Anza-Borrego Foundation.
Golden Pacific Powerlink comments and updates
City of Temecula
The City of Temecula's letters, videos and documents on the project.
Golden Pacific Powerlink: new routes, continued concerns
Save Our Heritage Organisation
The historic preservation case, including the Warner-Carrillo Ranch House.

Related county planning

A separate County effort that covers some of the same ground. The CPUC, not the County, decides the line.

North County Plan overview
County of San Diego
The County's North County habitat conservation plan. Its plan area includes Warner Springs.
North County Multiple Species Conservation Plan, notice of preparation
County of San Diego, March 6, 2025
The 2025 notice for the plan's environmental review, listing 40 covered species.

Research

What the science says, and just as important, what it does not. An overstated citation is the easiest kind for the other side to dismiss.

Are hotspots of evolutionary potential adequately protected in southern California?

Vandergast, A.G., Bohonak, A.J., Hathaway, S.A., Boys, J., and Fisher, R.N. 2008. Are hotspots of evolutionary potential adequately protected in southern California? Biological Conservation 141: 1648-1664. U.S. Geological Survey and San Diego State University.

What it found about Warner Springs

Warner Springs is the largest hotspot of genetic divergence in the study's multi-species map of southern California: an area where populations of many animal species are unusually different from one another genetically.
It sits where several mountain ranges meet the desert, with a steep rainfall gradient and the San Jacinto fault zone.
The authors say wildlife connectivity could be extended through this hotspot, from the foothills of the San Bernardino Mountains to Palomar Mountain and the Santa Ana Range.
In 2008 about half the region was unprotected. The largest unprotected piece was in the north, the foothills and valleys just south of the San Bernardino National Forest.

What it does not support

It maps broad regions, not exact locations. The authors say so themselves.
It uses existing mitochondrial DNA studies of 21 animal species. It is not a survey of every species on a right-of-way.
It is not a model of extinction. It does not say building a line would wipe out species.
It does not address fire. Fire is a separate argument with its own evidence.

The Vista Irrigation District says every route SDG&E has shown crosses the District's land at Warner Springs, on an easement 200 to 250 feet wide. SDG&E says access to build and maintain the line may include new roads and helicopter landing zones. That is a permanent corridor through the connectivity this paper says is worth protecting. That is the claim the paper supports, and it is strong enough on its own.

Sources: Vista Irrigation District; SDG&E

Every route crosses Warner Springs Read it at the publisher USGS record

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We link to the publisher and to the USGS record rather than posting the paper, because the publisher does not allow copies to be reposted.