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San Diego Gas & Electric

Sycamore-Peñasquitos 230 Kilovolt Transmission Line Project

(Application No. A.14-04-011)

Last Update: May 19, 2015

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Welcome to the California Public Utilities Commission (CPUC) website for the environmental review of San Diego Gas and Electric’s (SDG&E’s) proposed Sycamore-Peñasquitos 230 Kilovolt Transmission Line Project (Proposed Project) located in San Diego County, California. SDG&E submitted an application to the CPUC for a Certificate of Public Convenience and Necessity (CPCN) for the Project on April 7, 2014. The Proposed Project is subject to review under the California Environmental Quality Act (CEQA) and the CPUC is the CEQA Lead Agency.  A CEQA review will be performed to evaluate potential environmental impacts associated with this Project. This site provides access to public documents and information relevant to the CEQA environmental review process.


Frequently Asked Questions


Project Description

Application and Proponent's Environmental Assessment (PEA)

Deficiencies, Data Requests, and Responses

Environmental Review

    Draft Environmental Impact Report

For Additional Information

Upcoming Public Meetings

There are no meetings scheduled at this time.

Frequently Asked Questions

Members of the public requested that the CPUC provide answers to questions asked at the public scoping meetings. The CPUC has prepared responses to several Frequently Asked Questions (FAQs) to address this request. FAQs can be found here.


SDG&E has stated that the Proposed Project objective is to meet the California Independent System Operator (CAISO) 2012–2013 Transmission Plan Functional Specifications for a new 230-kV transmission line between the Sycamore Canyon and Peñasquitos Substations by:

  1. Ensuring the SDG&E bulk electric system continues to meet North American Electric Reliability Corporation, Western Electricity Coordinating Council, and CAISO reliability criteria
  2. Promoting compliance with State of California policy goals related to renewable integration and Once-Through Cooling retirement
  3. Economically and reliably meeting the San Diego metropolitan area’s forecasted load growth 
  4. Delivering energy more efficiently to the load center in San Diego

SDG&E has also stated that an objective of the Proposed Project  is locating the Proposed Project’s facilities in existing transmission and power line corridors, SDG&E ROW, SDG&E-owned property, and San Diego franchise rights-of-way. SDG&E’s objectives will focus the formulation of alternatives to the Proposed Project in the EIR. CEQA does not, however, require that alternatives meet each and every objective; the stated objectives therefore do not absolutely constrain development of alternatives to the Proposed Project.

Project Description

SDG&E's Proposed Project would be located within the Cities of San Diego and Poway. A portion of the Proposed Project would be located on the Marine Corps Air Station (MCAS) Miramar east of Interstate 15 (I-15). The Sycamore-Peñasquitos corridor traverses residential, open space, military (MCAS Miramar), vacant land, urban, commercial/shopping, industrial/energy facility, park, transportation, and light industrial/business park uses.

The Proposed Project includes construction and operation of a new 230-kV transmission line between the existing Sycamore Canyon and Peñasquitos Substations. The Proposed Project includes four transmission line segments and minor modifications to four existing substations:

Segment A: Sycamore Canyon Substation to Carmel Valley Road. SDG&E would construct an approximately 8.31-mile long 230-kV transmission line on 36 new double-circuit 230-kV and two 138-kV tubular steel poles (120-foot and 75-foot average height, respectively) from the Sycamore Canyon Substation to Carmel Valley Road. Two existing transmission lines (TL 13820 and TL 13825, which both terminate at Chicarita Substation) would be relocated to the new tubular steel poles, and approximately 42 wood H-frame structures, two tubular steel poles, one double-circuit cable pole, and two single-circuit wood mono poles associated with the two existing transmission lines would be removed. A portion of TL 13820 would be undergrounded as it enters the Sycamore Canyon Substation. Existing transmission line TL 23041 would be relocated to two new 230-kV structures within and immediately adjacent to the Sycamore Canyon Substation to make room for the new 230-kV connection at the substation.

Segment B: Underground Carmel Valley Road. SDG&E would construct an approximately 2.84-mile long 230-kV underground transmission line in Carmel Valley Road. Two cable pole structures (160-foot average height) for underground/overhead transmission conversion would be placed at the ends of the undergrounded segment. One double-circuit steel lattice tower would be removed at the western reach of the segment. Also, one 138-kV single circuit wood H-frame structure would be removed.

Segment C: Carmel Valley Road to Peñasquitos Junction. SDG&E would install approximately 2.19 miles of 230-kV conductor on existing steel lattice structures and one new tubular steel pole between Carmel Valley Road and Peñasquitos Junction. One steel lattice tower would be removed at the Peñasquitos Junction. Two existing transmission lines (TL 23001 and TL 23004) would be reconductored and bundled on the existing structures and re-designated as TL 23004. Existing shield wire on top of existing 230-kV steel lattice towers would be replaced with new optical ground wire.

Segment D: Peñasquitos Junction to Peñasquitos Substation. SDG&E would install approximately 3.34 miles of 230-kV conductor on existing double-circuit lattice towers and a tubular steel pole between the Peñasquitos Junction and the Peñasquitos Substation. SDG&E would also consolidate two existing 69-kV power lines (TL 675 and TL 6906) onto 17 new 69-kV tubular steel poles (95-foot average height) that would replace 16 existing 69 kV wood H-frame structures and five wood monopoles. Two tubular steel poles would replace two existing wood cable poles outside the Peñasquitos Substation. Existing shield wire on top of existing 230-kV steel lattice towers would be replaced with new optical ground wire.

Sycamore Canyon Substation. SDG&E would modify Sycamore Canyon Substation to facilitate the new 230-kV transmission line connection. Modifications would include transferring five existing transmission lines from existing bay positions to new bay positions, and adding a new circuit breaker.

Peñasquitos Substation. SDG&E would modify Peñasquitos Substation to facilitate the new 230-kV transmission line connection. Modifications would include adding two circuit breakers and four disconnects.

San Luis Rey and Mission Substations. Minor alterations may be made to these substations, including adjusting relays and upgrading protection on remaining lines.

Temporary Staging Yards. The Proposed Project would utilize approximately 25 acres of temporary construction staging yards for vehicles equipment refueling, pole assemblage, open storage of material and equipment, construction trailers, portable restrooms, parking, lighting, possibly generator use for temporary power in construction trailers, and incidental landing areas for helicopters. Four staging yards have been identified by SDG&E at this time, including the Stonebridge Parkway, Stowe, Torrey Santa Fe, and Carmel Valley Road Staging Yards. Refer to Figures 2 through 4 for staging yard locations. A potential fifth staging yard at Carmel Mountain Road has been dropped from the Proposed Project due to site development. Additional staging yards may be proposed by SDG&E.

Access Roads. Construction would primarily take place within the existing SDG&E ROW easements and access roads and public roadways. Most work areas would be accessible by vehicle on unpaved SDG&E-maintained access roads or by overland travel. Access roads would be used for vehicle parking and turn-around, and specific construction site staging.

A map of the Proposed Project showing Segments A-D can be viewed here: Project Overview Map

Application and Proponent's Environmental Assessment (PEA)

SDG&E filed an application (A.14-04-011) for a CPCN and Proponent's Environmental Assessment for the Project on April 7, 2014. The PEA is a starting point for the independent environmental review process conducted by the CPUC. The application was deemed complete on July 24, 2014. 

The application can be viewed here:  Application (2.5 MB)

The PEA can be viewed here:  PEA (32.9 MB)   PEA Appendices (167.2 MB)

Deficiencies, Data Requests, and Responses

The CPUC Environmental Review Team submitted data requests to the applicant for specific information to support the environmental review process. Those requests and the applicant's responses are published below.

CPUC Report/Request
SDG&E Response
Deficiency Report
(Submitted May 7, 2014)
Response 1 (June 18, 2014)
Response 2 (Part 1) (July 7, 2014)
Response 2 (Part 2) (July 16, 2014)
Data Request 1
(Submitted August 6, 2014)
Response (Part 1) (August 18, 2014)
Response (Part 2) (September 9, 2014)
Response (Part 3) (September 16, 2014)
Response (Part 4) (October 8, 2014)
Update to Q67       (October 17, 2014) 
Data Request 2
(Submitted October 6, 2014)
Response (Part 1) (October 24, 2014)
Response (Part 2) (October 31, 2014)
Response (Part 3) (November 3, 2014)
Data Request 3
(Submitted November 17, 2014)
Response (Part 1) (November 25, 2014)
Response (Part 2) (December 5, 2014)
Response (Part 3) (December 12, 2014)
Response (Part 4) (December 16, 2014)
Response (Part 5) (January 29, 2015)
Response (Part 6) (February 13, 2015)
Data Request 4
(Submitted November 21, 2014)
Response (December 19, 2014)
Data Request 5
(Submitted January 9, 2015)
Response (Part 1) (January 23, 2015)
Response (Part 2) (January 30, 2015)
Response (Part 3) (February 3, 2015)
Supplemental Response (March 12, 2015)
Data Request 6
(Submitted January 22, 2015)
Response (January 29, 2015)
Response (Part 1) (February 25, 2015)
Response (Part 2--GIS Files) (February 25, 2015)
Supplemental Response (March 12, 2015)
Data Request 8
(Submitted March 4, 2015)
Response (Part 1) (March 25, 2015)
Response (Part 2) (March 27, 2015)
Data Request 9
(Submitted March 17, 2015)
Response (Part 1) (March 30, 2015)
Response (Part 2) (April 24, 2015)
Response (Part 3) (April 30, 2015)
Data Request 10
(Submitted April 8, 2015)
Response (Part 1) (April 21, 2015)
Response (Part 2) (April 24, 2015)
Data Request 11
(Submitted April 14, 2015)
Response (Part 1) (April 14, 2015)
Response (Part 2) (April 27, 2015)
Data Request 12
(Submitted April 30, 2015)
Response (Part 1) (May 5, 2015)
Response (Part 2) (May 14, 2015)

Environmental Review

Draft Environmental Impact Report

The CPUC has determined that an Environmental Impact Report (EIR) appears to be the appropriate CEQA document to prepare for the Project. The Draft EIR is currently under preparation.

Notice of Preparation 
Issuance of a CEQA Notice of Preparation (NOP) is the first step in the EIR process. This document provides a description of the proposed Project and potential alternatives, as well as a schedule of the CPUC's proposed scoping process that will include public scoping meetings and agency consultations. The NOP was published on August 11, 2014. Click here to view the NOP.

Scoping Period and Meetings
The scoping period began on August 18, 2014 and ended on September 16, 2014. In order for the public and regulatory agencies to have an opportunity to ask questions on the scope of the EIR, the CPUC held three scoping meetings in the project area on August 25 and 26, 2014. 

Public Scoping Report
The CPUC prepared a Public Scoping Report that documents the scoping activities and oral comments from the scoping meetings, as well as the written comments submitted in response to the NOP. This report serves as an information source to the CPUC in the determination of the range of issues and alternatives to be addressed in the Draft EIR. Click here to view the Scoping Report and Appendices.

The CPUC will continue to accept and consider comments and questions about the proposed Project throughout the environmental review process. Comments and questions can be sent to the Project email.

For Additional Information

Additional information will be posted on this site as it becomes publically available.

The CPUC, through its Environmental Review Team, is conducting an environmental review of the Project. To request additional information, ask a question, or be added to the Project mailing list, please contact:

Voicemail or Fax

v:(650) 373 - 1200, f: (650) 373 - 1211

U.S. Mail or Courier

Billie Blanchard
California Public Utilities Commission
505 Van Ness Ave, 4th Floor
San Francisco, CA 94102

c/o Panorma Environmental, Inc.
1 Embarcadero Center, Suite 740
San Francisco, CA 94111


Related Links:
CPUC Proceeding
A.14-04-011 - Proceeding

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