Western Underground SDGE Smart Technology & Grid Hardening 1

Topics Deployment of Overhead Radio Fault Indicators Deployment of Undergroud Radio Fault Indicators Hendrix/Steel Pole Installations Steel Poles In HFRA & Fiberglass Poles In Wetland Locations 2

SDG&E Overview San Diego Gas & Electric ® was founded in 1881, supplying 59 customers with gas for streetlights, homes and businesses in downtown San Diego (now the Gaslamp District). Today, SDG&E is a regulated, public utility providing safe and reliable energy services to 3.4 million customers through 1.4 million electric meters and 840,000 natural gas meters in San Diego and South Orange County. Customer mix is 89% residential and 11% commercial & industrial. SDG&E and Southern California Gas Company are a part of Sempra Energy, a Fortune 500 company. 3

System Statistics – Electric Distribution Over 1000 Circuits; about 163,000 transformers, 4100 sq. miles – 4 kV, 12 kV, – About 70% Underground; almost 22,000 miles total – Heavily automated at substation and circuit level, with over 1000 SCADA controlled devices, and over 75 SCADA substations – Five year average SAIDI less than 60 minutes – About 500 cable faults per year, 1800 outages total – Over 160 MW distributed solar now, across 22,000 customers – One of first major cities to rollout electric vehicles – 2K customers to date – Six main operating districts with two satellites – Coastal, inland, mountain, and desert environments SDG&E was first California IOU to file comprehensive Smart Grid Deployment plan to CPUC – June

Overhead Radio Fault Indicators 5

Development of Radio Fault Indicators Schweitzer Engineering Laboratories provides most of our fault indicators On Ramp Wireless (ORW) worked with SEL to incorporate communications into an existing OH fault indicator Provided a working device which required testing 6 WSO-11 FCI

Goal of Overhead Wireless Fault Indicator Project Deployed and tested 25 units for proof of concept – Using the ORW Network They worked Install 2800 units in 2012 – Required SDGE Installing 35 Access Points Our Goal is to install over 10,000 FCIs, combination of OH and UG, by 2017 Sync with OMS/DMS for Operations 7

Approach and Methodology Locations Picked – Non-SCADA switches – Non-SCADA circuits – Replacing Non-Wireless Fault Indicators – Grounding Banks Verify communication coverage at each location from OnRamp provided network coverage Future locations – Solid blade fuses – Key branches – 12/4kV Step-downs 8

Example Of Overhead FCI Deployment Rural Circuits with High Fire Danger – Elevated fire condition policy: Completely patrol a line before reenergizing, after a circuit trip. We operate in this condition for almost half the year, covering much of the service territory Lack of vehicle access makes this process arduous, especially for distribution lines – Thus automation to pin point the fault was a major driver – In 2012 we began installing the production units of the SEL/ORW Overhead Wireless Faulted Circuit Indicator (FCI) System changes and firmware upgrades can be done remotely, which is very important with many units in the field 9

kV Circuit Located in Extreme Fire Area Many miles from substation Fault Last Communicating Device “Intellirupter” Sub ETS would have to patrol from here, possibly taking hours to restore the circuit

Many miles from substation Fault ETS would have to begin his patrol here saving hours in circuit restoration No fault LOC event Shows Fault “Intellirupter” 12kV Circuit Located in Extreme Fire Area Sub

12 Installed WFIs on Distribution Circuit WFI being installed with a “Shotgun” WFI installed on “A”, “B”, & “C” Phases Antenna

Underground Fault Indicators 13

Goal of Underground Wireless Fault Indicator Project Having the FCI communicate in the overhead located 30+ feet above ground is much different than being able to communicate: – From within a pad mounted structure – From within an underground manhole or handhole – From within an underground vault two stories below grade Thus it was necessary to pilot underground FCI’s in the various combinations 14

DOE Underground FCI Pilot This project was sponsored by – Department of Energy (DOE), – On Ramp Wireless, – Schweitzer Engineering Laboratories – SDG&E The first step was to install an ORW/SDGE Test Network for our underground pilot – This required installing Access Points (AP’s) in four areas 15

DOE Underground FCI/Transformer Pilot The next step was to locate underground switches within ½ mile radius of each Access Point – The SEL FCI’s for switches are self powered (8301D) –first generation In each area we have deployed three FCI’s We tested, and continue to test the SEL 8301D FCI’s The goal is to test communications as well as data accuracy 16

DOE Underground FCI/Transformer Pilot – Cont’d Fall of 2012, SEL developed a new and improved underground FCI A – The 8301A FCI was equipped with two antennas which offer increased propagation range using diversity scheme – Part II of the pilot was to increase our installation radius from the AP of ½ mile, to ¾ mile for the FCI’s – We installed ten more FCI (8301A) second generation units Again the goal is to measure communications reliability and data accuracy The next slide will show a coverage map and some of the results, followed by pictures of our installations 17

© On-Ramp Wireless, Inc. All rights reserved. 18 Century Park Coverage Map

SDGE Summary June 28, 2012 – January 3, Schweitzer Engineering Labs Underground 8301D FCIs – Reporting every 24 hours 10 Schweitzer Engineering Labs Underground 8301A FCIs – Reporting every 6 hours – Installed mid November 11 Padmounts, 3 Manholes, 5 Vaults, & 1 Handhole SDU Reliability: 99.7%* – SDUs expected – SDUs received * The reliability was 99.9% if we factored out one problem switch 19

20 SDGE Summary Slide – Asset Type ReceivedExpectedPercent Manhole % Padmount % Vault % Handhole % ReceivedExpectedPercent All % Excluding Thornmint TIQ % 8301D (within.5 mile radius) % 8301A (within.75 mile radius) % 20

Radio Ranger Installed On PME 10 Switch SEL Sensing Coils 8301D Radio Ranger/Internal Battery With ORW Radio ORW Remote Single Antenna Compartment 1 21

Radio Ranger Installed On A PME 10 Switch 8301A Radio Ranger Two Antenna’s SEL Sensing Coils 22

Radio Ranger Installed On PME 10 Compartments 3 & 4 Compartment 4 Compartment 3 SEL Sensing Coils Sensing Cables Route Under the Switch To The Radio Ranger Located In Compartment 1 23

Four-Way Gas Switch SEL Sensing Coils 8301D Radio Ranger Single Antenna 24

Four-Way Gas Switch Antenna 8301D Radio Ranger With ORW SEL Sensing Coils 25

Handhole Mounted 8301A Radio Ranger Hinged Aluminum Lid Two Antenna’s: Signal Must Propagate Through Aluminum Lid 8301A Radio Ranger 26

Vault Mounted Four Way Gas Switch – Vaults Are Dry 8301A Radio Ranger Mounted On Vault Wall 27

Same Vault Mounted Switch With 8301A Radio Ranger – Vaults are Dry Vault Cover, Cast Iron Lid Two Antenna’s Signal Must Propagate Through Cast iron Lid/Concrete 8301A Radio Ranger 28

Manhole Mounted – 8301D Radio Ranger Fault Indicator – Manholes Subject To Submersion 8301D Radio Ranger Mounted On Wall Of Manhole Single Antenna Mounted In The Neck Of The Manhole, Signal must propagate through cast iron lid/concrete Coaxial Cable 29

SEL Sensing Coils On G&W Oil Switch Radio Ranger Installed On A 4 Way Oil Switch – Subject To Submersion 30

Preparation To Install Radio Ranger Fault Indicators In A Manhole Pumper Truck Traffic Control However Once Installed We May Not Need To Open The Manhole 31

SDGE Future Plans For Underground FCI’s We have been pleased with the results We are working with SEL on several product improvements Pressure sensor for measuring water depth in manholes Better load accuracy from the pick-up coils SEL plans to have those improvements completed this year SDGE plans to install 100 units in

Hendrix Spacer Cable System 33

Hendrix Overhead Construction Hendrix Spacer Cable System is used world wide in areas that are Heavily wooded Have significant wind, ice and snow Used in Australia in high fire prone area Our first application using Hendrix was on Palomar Mountain. We used Hendrix Tree Wire on conventional crossarms for this heavily wooded area. After the fact, we learned that the Hendrix Spacer Cable System was over three times as strong, and much more reliable than open wire installations Thus, SDGE worked with Hendrix to modify their products to be applicable to California’s G.O. 95 requirements 18” phase to phase 9” phase to ground 34

Hendrix Installations At SDGE Hendrix modified their brackets, and spacers to comply with California requirements Tangent Bracket, “C” Bracket, “E” Bracket, & GO 95 Spacer Our first spacer application was installed at our Skills Training Center The next two spacer cable applications were in heavily treed areas All the above jobs, and all future Hendrix jobs will be installed on steel poles for strength and added fire protection The advantage of the spacer cable system is: Traditional ACSR wire has a breaking strength of ~4000#’s Hendrix Spacer System relies on a messenger cable with breaking strength of ~17,000 #’s The conductors are insulated thus if a tree branch falls across the messenger and conductors there is no fault, and in most cases the system stays in tact 35

36 Hendrix Termination Bracket & Polymer Deadend with Hendrix Preforms GO95 Spacers Hendrix Tangent Bracket With GO95 Spacer Skills Training Center Level Ground

37 Steel Pole with Hendrix Tangent Support Bracket & G095 Spacer GO95 Spacers installed approximately 30 feet apart Skills Training Center – Level Ground

Palomar Mountain Heavy Tree Area With Snow and Ice In The Winter – Line Changes 600’ Elevation in a little over 2500’ Horizontally 38

Palomar Mountain Heavy Tree Area With Snow and Ice In The Winter Tangent Construction 39

Palomar Mountain Hendrix Construction With Transformer “C” Bracket with Messenger Deadended Cutouts on Alumaform Arms 40

Looking North Down The Hill Palomar Mountain Hendrix Construction Steep Slope “C” Bracket With Messenger Deadended For Steep Slope Swivel GO 95 Spacers For Steep Slope Construction 41

42 Steel Poles In HFRA & Fiberglass Poles In Wetland Locations

Over the last few years we have installed over 4,000 Steel Poles in back country locations Our poles are manufactured by Valmont, with equipment and climbing holes in a “knock-out” configuration Our poles are direct buried with treated “butts” of an epoxy compound called “Corrocoat” We have “RIV Grounds” installed at each equipment level including communications and at the “butt” for the ground rod connection We use galvanized poles in urban locations, and use weathering steel in back country locations including the national forest 43

Steel Poles In HFRA & Fiberglass Poles In Wetland/Back-lot Locations – Cont’d We have also started using fiberglass poles in wetland and back lot locations, and have installed approximately 40 poles to date We are using RS Structure Fiberglass poles The poles come “nested” Advantage for back lot locations is that they can be hand carried into those locations and “ginned” into place For wet land locations the poles can be pre-assembled or assembled on site We often install these poles using “sono tubes” We order the poles pre-drilled with climbing holes Grounds etc. are extended internally inside of the poles 44

First Fiberglass Poles Set In SDGE Service Territory Existing Two Pole Structure in this Marsh land location had rotted out 45

46 Marshy Area Required Placing Sono Tubes For Installation Two Pole Fiberglass Structure First Fiberglass Poles Set In SDGE Service Territory