GREENING THE GRIDCelebrating California’s Progress in Renewable Energy

The Tehachapi RenewableTransmission ProjectThe Tehachapi RenewableTransmission Project

March 2010

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Tehachapi Renewable Transmission Project:Leading the Way to a Greener Future

The completion of segments 1-3A of the Tehachapi RenewableTransmission Project in 2009 is a significant milestone in California’sjourney to a cleaner, greener future.

In December 2009, after extensive environmental and regulatory analysis and public review, the California PublicUtilities Commission (CPUC) approved SCE’s application tobuild segments 4-11. Upon completion of the additionalsegments, the Tehachapi project will be capable of delivering4,500 megawatts of clean, wind-generated energy, enoughto supply nearly 3 million homes at peak output.

As the nation’s largest purchaser of renewable energy, SCEin 2009 delivered approximately 13.6 billion kilowatt hoursfrom wind, solar, biomass, geothermal and small hydroenergy suppliers – approximately 17 percent of the powerwe deliver to customers. The Tehachapi project is yetanother essential component of SCE’s commitment to helpto effectively reduce greenhouse gas emissions and meetCalifornia’s renewable energy goals.

SCE is proud to be leading the way in this monumentaleffort.

The Tehachapi Renewable Transmission Project is Needed to Meet State Renewable Energy Goals

SCE’s Tehachapi Renewable Transmission Project is the first major transmission project in California being constructedspecifically to access multiple renewable generators in a remote renewable-rich resource area. When complete,the Tehachapi project will be a key component of SCE’scomprehensive program to provide the high-voltage transmission infrastructure necessary to interconnect anddeliver the renewable resources being developed in the

2004 2007 2008 2009 2010 2011 2015

Applicationfor Seg 1-3filed with

CPUC

Seg 1-3approved by

CPUC

Constructionof Seg 1-3

begins

Seg 1,2, 3Acomplete

CPUC approval ofSeg 4-11

Constructionof Seg 4-11

begins

Seg 3Bcomplete

Seg 4-11estimatedcompletion

Timeline

Tehachapi Wind Resource Area to SCE customers and theCalifornia transmission grid.

Completing the Tehachapi project is essential to helpingCalifornia expand its renewable energy portfolio.

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Los Angeles County e Los Angeles County

SCE is the nation's leader in renewable energy, with about 17 percent ofthe electricity delivered to customers coming from renewable sources.

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Natural Gas

SCE is investing in a reliable,safe neighborhood-level electricitysystem that is cleaner, smarter andefficient. SCE is a pioneer in the useGrid technologies.

SCE is expanding and enhancingthe transmission system tomaintain reliability and increaseaccess to areas rich with potentialfor wind, solar and other renewablepower generation.

SCE’s Vision for a Clean

Nuclear

Tapping the Wind-Rich Tehachapi Area

As a result of California’s geography, tax incentives, andfavorable legislation in response to the 1970s energy crisis,California became the first state to develop large wind farmsin the early 1980s. In particular, the unique geography ofthe Tehachapi area makes it one of the world’s leading windenergy centers, as prevailing northwesterly winds blowthrough the passes in the Tehachapi Mountains that connectthe San Joaquin Valley with the Mojave Desert.

In response to adoption of the state’s Renewables PortfolioStandard goals, and recognizing further untapped potentialin the Tehachapi area, the CPUC established the TehachapiCollaborative Study Group “to develop a comprehensivetransmission development plan for the phased expansion of transmission capability in the Tehachapi area.” Followingreports issued by the study group in 2005 and 2006, the CPUC facilitated an agreement between SCE and theCalifornia Independent System Operator on a plan to providefor the orderly, rational and cost-effective construction ofTehachapi project facilities. In January 2007, the CaliforniaIndependent System Operator Board of Governors approvedthe Tehachapi project plan of service for segments 4-11 and directed SCE to proceed with the necessary permittingand construction.

New Infrastructure – More Power for Customers

The Tehachapi project will consist of more than 250 milesof new and upgraded high-voltage transmission facilities.The project will extend from Eastern Kern County to the city of Ontario in San Bernardino County, passing throughportions of the Antelope Valley, the Angeles National Forest,the San Gabriel Valley and the Western Inland Empire.

In order to minimize costs and environmental impacts, theTehachapi project is being constructed primarily in existingrights-of-way, with existing facilities either being replaced orupgraded. SCE will continue to work with federal, state, andlocal agencies, as well as communities impacted by theproject, to seek input, address concerns, secure all necessaryapprovals and expedite construction of the project.

Additional InformationFor more information about the Tehachapi project, pleasevisit www.sce.com/tehachapi or call (877) 795-8787.

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Hydro

distributionmoreof Smart

SCE is installing about 5 million advanced Edison SmartConnect TM electricitymeters to enhance services for customers and help them manage energy usewisely. Over the last five years, SCE's energy-efficiency programs have helpedcustomers save 6.8 billion kilowatt-hours – more than any utility in the nation.

Plug-in vehicles willconnect and communi-cate with the SmartGrid, allowing Edisonand its customers tomanage the demandon the system and thecosts associated withusing electricity to fueltransportation.

SCE believes the grid of the futurewill feature new emerging energystorage technologies throughoutthe system from small distributedapplications for homes and localcommunities up to large centralplant applications that helpintegrate intermittent renewableresources such as wind and solar.

ner, Smarter Energy Future

© 2010 SOUTHERN CALIFORNIA EDISON

© 2010 Southern California Edison

Additional InformationFor more information about the Tehachapi project, please visit

www.sce.com/tehachapi or call (877) 795-8787.