SCE has filed an application with the CPUC to construct the Devers-Mirage 115 kV Subtransmission System Split Project. The CPUC is the CEQA lead agency. The Devers 115 kV Subtransmission System split portion of the project was approved by the California Independent System Operator (CAISO) in 2002 and the Devers-Coachella Valley 220 kV transmission line loop into Mirage Substation portion of the project was approved by CAISO in 2006.
The main components of the Devers-Mirage 115 kV Subtransmission System Split Project, as proposed by SCE, includes: the replacement of approximately 5.3 miles of existing single-circuit 115 kV subtransmission line with new higher capacity double-circuit 115 kV subtransmission line between Farrell and Garnet substations in the City of Palm Springs; construction of a new 115 kV subtransmission line from Mirage Substation south to Interstate 10 (I-10); looping the existing Devers-Coachella 220 kV transmission line from an existing right-of-way (ROW) for approximately 0.8 of a mile on double-circuit lattice steel towers (LSTs) to Mirage Substation. In addition, the project would include installation of one new 280 megavolt amperes (MVA) 220/115 kV transformer, two new 220 kV circuit breakers, and five new 115 kV circuit breakers at SCE's existing Mirage Substation.
The project would also include additional equipment and relays installations at Mirage, Concho, Indian Wells, Santa Rosa, Devers, Eisenhower, Farrell, Garnet, Thornhill, and Tamarisk substations located in the cities of Palm Springs, Rancho Mirage, Indian Wells, Cathedral City, Palm Desert, and unincorporated areas of Riverside County, including the Thousand Palms community. SCE also proposes to transfer existing fiber optic cable to the new support structures and install new fiber optic and digital telecommunications equipment as part of the project.
The project is needed to relieve existing thermal overload conditions on two 115 kV subtransmission lines and to resolve a forecasted voltage problem on the 220 kV transmission system that would exist by 2011. The total cost of the project is estimated to be approximately $33.3 million. Construction of the project is scheduled to begin in the second quarter of 2010 and be operational by mid-2011.
Proponent's Environmental Assessment (PEA)
The application and PEA for the Devers-Mirage 115 kV Subtransmission System Split Project may be viewed here. The application was deemed complete by CPUC on February 29, 2008.
To view the Application for the project click here.
To view the PEA for the project click here.
Other Documents Available
Application Deemed Complete Letter (February 29, 2008), click here to view.
Public Scoping Period
On April 15, 2008 the CPUC published a Notice of Preparation (NOP) of an Environmental Impact Report (EIR) for the Devers-Mirage 115 kV Subtransmission System Split Project. Click here to view the NOP.
As required by State law, a 30-day public scoping period was held as part of the environmental review process for the proposed project. The scoping period closed at 5:00 p.m. on May 15, 2008. In order for the public and regulatory agencies to have an opportunity to directly ask questions and submit comments on the scope of the EIR, a meeting was held during the NOP scoping period. Oral comments received at the scoping meeting and additional written comments submitted to the CPUC are documented in the Scoping Report prepared for the project. The Scoping Report also includes other materials and documents applicable to the CEQA scoping process for the proposed project.
To view the Scoping Report, click here (10.1mb).