- link Copy Url - [ Share on twitter ](https://twitter.com/intent/tweet?text=SCE Completes Seismic Retrofit of the Grid's 'Backbone' https://www.3blmedia.com/markdownify/node/1236396?absolute=1&via=3blnews "link to 3 B L Media's Twitter") - [ Share on linkedin ](https://www.linkedin.com/shareArticle?mini=true&url=https://www.3blmedia.com/markdownify/node/1236396?absolute=1 "link to 3 B L Media's Linkedin") - [ Share on facebook ](https://www.facebook.com/sharer/sharer.php?u=https://www.3blmedia.com/markdownify/node/1236396?absolute=1 "link to 3 B L Media's Facebook") - [ email Share via email ](mailto:?subject=SCE Completes Seismic Retrofit of the Grid's 'Backbone'&body=ESG News from Edison International https://www.3blmedia.com/markdownify/node/1236396?absolute=1 "Share via email") [Energy](/CSR-News/energy-0) # SCE Completes Seismic Retrofit of the Grid's 'Backbone' ##### The five-year project will help keep power flowing in Southern California if a major earthquake occurs along the San Andreas Fault. Oct 24, 2023 10:15 AM ET ![John Dai describes welds](/sites/default/files/styles/carousel_2x/public/images/Backbone_Edison-International_101723.jpeg "John Dai, SCE senior manager of Resiliency, describes welds that anchor a large transformer to plates that are embedded in a substation foundation slab to improve seismic resiliency. PHOTO CREDIT: Donna Boston") ![Mark Lopez discussing safety protocols](/sites/default/files/styles/carousel_2x/public/images/Backbone-2_Edison-International_101723.jpeg "Mark Lopez, senior supervisor at SCE’s Devers Switching Center, discussing safety protocols with (l-r) Esam Abraham, SCE Business Continuation engineer, Ken Hudnut, SCE seismic expert and Anthony Stone, SCE senior engineer. PHOTO CREDIT: Donna Boston") ![John Dai describes welds](/sites/default/files/styles/carousel_thumbnail_x2/public/images/Backbone_Edison-International_101723.jpeg?h=b52daf8b "John Dai, SCE senior manager of Resiliency, describes welds that anchor a large transformer to plates that are embedded in a substation foundation slab to improve seismic resiliency. PHOTO CREDIT: Donna Boston") ![Mark Lopez discussing safety protocols](/sites/default/files/styles/carousel_thumbnail_x2/public/images/Backbone-2_Edison-International_101723.jpeg?h=b52daf8b "Mark Lopez, senior supervisor at SCE’s Devers Switching Center, discussing safety protocols with (l-r) Esam Abraham, SCE Business Continuation engineer, Ken Hudnut, SCE seismic expert and Anthony Stone, SCE senior engineer. PHOTO CREDIT: Donna Boston") [Energized by Edison](https://energized.edison.com/stories/sce-completes-seismic-retrofit-of-the-grids-backbone) By **Reggie Kumar**, ENERGIZED by Edison Writer The 5.1 magnitude earthquake that struck Ojai during Hurricane Hilary in August,[ also known as #Hurriquake](https://www.nbclosangeles.com/news/national-international/what-is-a-hurriquake-its-something-socal-never-thought-theyd-face/3209706/ "https://www.nbclosangeles.com/news/national-international/what-is-a-hurriquake-its-something-socal-never-thought-theyd-face/3209706/"), was an [excellent reminder to always be prepared](https://energized.edison.com/stories/sce-reminds-customers-dont-wait-for-a-disaster "https://energized.edison.com/stories/sce-reminds-customers-dont-wait-for-a-disaster"). Earth scientists say that a 7.0 magnitude or greater earthquake has a [75% likelihood of occurring in the next 30 years](http://wgcep.org/UCERF3 "http://wgcep.org/UCERF3") in Southern California. If a big earthquake happens, some communities may experience severe damage and lose electricity. That’s why Southern California Edison has been focused on completing seismic mitigation work on 50 of its largest bulk power transmission substations, including those closest to the San Andreas Fault. They are known as the “backbone” of the company’s electric grid and help provide electricity to about 15 million people. SCE engineer Anthony Stone Jr. played a critical role in completing the five-year project as part of SCE’s Seismic Resiliency Program. “Retrofitting substations to ensure the uninterrupted flow of energy during a major earthquake demanded meticulous planning, engineering expertise and substantial resources,” Stone said. “However, the satisfaction of knowing that the work has reached a critical juncture is immeasurable.” Reaching that critical juncture after completing seismic mitigation work on the 500 kV and 220 kV large bulk transmission electric substations will help keep power flowing during a significant earthquake. Some improvements required enhanced anchoring of large transformers, replacing older equipment components with seismically tested ones, increasing the slack of conductors between equipment components and replacing porcelain bushings. “The bulk power substations seismic mitigation effort presented a significant challenge from the beginning due to the project’s scale and complexity,” Stone said. That’s why years of research was conducted before the seismic work began in 2018 and included analyzing Southern California earthquakes that occurred in 1933, 1971, 1986 and 1994. They helped determine where seismic improvements needed to be made in [SCE’s 50,000-square-mile service area](https://www.sce.com/about-us/who-we-are/leadership/our-service-territory "https://www.sce.com/about-us/who-we-are/leadership/our-service-territory"). Last month, a group of SCE employees and leaders, including Jill Anderson, executive vice president of operations, toured a section of the San Andreas Fault and visited one of the newly retrofitted 500 kV transmission substations near Palm Springs. “SCE has invested more than $186 million in seismic grid resiliency improvements since 2016,” Anderson said. “The benefits of completing the seismic improvements are substantial and will help safeguard our energy infrastructure and minimize the potential disruption to the communities we serve and the economies we support.” Additional earthquake improvement work is underway at the same 50 substation locations, but now the focus is on the mechanical, electric-equipment rooms, which house important devices called relays that allow the remote operation of substation equipment. “From the beginning, we considered the potential for strong shaking, surface rupture, soil liquefaction and earthquake-induced landslides during the retrofitting process,” said Ken Hudnut, SCE’s seismic expert. “The company systematically assesses and reviews risks to its assets regularly.” > SCE is participating in [“The Great California ShakeOut” on Oct. 19 at 10:19 a.m. PDT](https://www.shakeout.org/california/ "https://www.shakeout.org/california/"). The company also offers tips to help prepare before the next earthquake hits: > > - Secure items that could topple or become airborne. > - Store plenty of extra drinking water. > - Know how to shut off the electricity in your home. > - Unplug appliances and electronics. > - Stay away from downed power lines, call 911 to report. ***For more information about how to keep you and your family safe, visit*** [***sce.com/beprepared***](https://www.sce.com/beprepared "https://www.sce.com/beprepared") [![](/sites/default/files/Clients/EIX_logo_w_tagline_horizontal_cmyk.jpg)](/profiles/edison-international) ### More from Edison International ###### [10 New Year’s Resolutions for a Greener 2024](/news/10-new-years-resolutions-greener-2024) Dec 29, 2023 3:45 PM ET ###### [COP28: Moving From Promises to Progress](/news/cop28-moving-promises-progress) Dec 29, 2023 12:15 PM ET ###### [Bringing Solar Power to Apartment Tenants](/news/bringing-solar-power-apartment-tenants) Dec 21, 2023 9:15 AM ET ###### [’Tis the Season To Donate Toys](/news/tis-season-donate-toys) Dec 18, 2023 10:15 AM ET ###### [Fighting Food Insecurity One Box at a Time](/news/fighting-food-insecurity-one-box-time) Dec 14, 2023 9:15 AM ET ###### [Countdown to 2045: Near-Term Priority Actions To Achieve Net Zero](/news/countdown-2045-near-term-priority-actions-achieve-net-zero) Dec 11, 2023 9:35 AM ET ###### [Countdown to 2045: Executive Summary](/news/countdown-2045-executive-summary) Dec 4, 2023 9:45 AM ET ###### [Taking Clean Energy Education on the Road](/news/taking-clean-energy-education-road) Nov 29, 2023 10:45 AM ET