January 2009 SEMO Ice Storm Extreme Measures IEEE-PES St Louis Chapter Meeting June 18, 2010 Presented by David Wakeman Vice President, Energy Delivery AmerenUE

2 Founded 1902 Serves 1.2 million electric customers and 127,000 natural gas customers 21,000 square mile service territory

3 Missouri Counties Served by AmerenUE That Were Affected Cape Girardeau Dunklin Mississippi New Madrid Pemiscot Scott Stoddard

4 January 2009 Ice Storm Up to 5” of ice accumulation Affected 36,500 customers The entire “bootheel” area—including AmerenUE facilities—was seriously impacted Over 4000 storm response personnel involved Replaced 3800 poles and 1,440,000 ft of wire (273 miles) All customers restored in 9 days

5 Monday, January 26 Quantum Weather predicts the possibility of ice storm in southern 1/3 of state Mobilized contractor resources and Missouri Valley resources to SEMO south—approximately 250 personnel Mobilized 3 storm trailers and 1 Mobile Command Center

6 Tuesday, January 27 Day 1 At 4 a.m. only 800 customers out—Just the tip of the ICEberg Major ice accumulation occurring throughout the day in SEMO south area Decision made to move all AmerenUE resources to SEMO Outage numbers climb throughout the day Additional contractor resources procured 650 linemen and 350 tree trimmers engaged by end of day

7 Wednesday, January 28 Day 2 Ice continues to build— outage count over 36,000 in A.M. 6 counties in Bootheel are essentially without power Base Logistics called in A.M. to support logistics effort Decision made to use Extensive Damage Recovery Method SEMO south divided into 8 “restoration islands” 1150 linemen and 450 tree trimmers engaged by end of day

8 Thursday, January 29 Day 3 2 helicopters employed to patrol 34 Kv system. Found 80 miles of line on the ground Restoration plan is developed Repair effort is focused on 34.5 Kv system to get substations re-energized Massive amounts of devastation being reported Established Field Logistics Team to help manage the logistics effort

9 Restoration Progress Sunday Feb 1 Most 34.5 kV circuits restored Released 1 st Estimated Restoration Time Monday Feb 2 All 34.5 kV circuits restored (except Portageville 71—30 miles to rebuild) Many distribution circuits restored Tuesday Feb 3 Customer outages under 10,000 to start day Most customers restored by end of day Wednesday Feb 4 All customers restored by end of day Work begins on Portageville 71

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12 Damage Summary Virtually 100% of AmerenUE customers in 6 counties without power 34 KV Sub-transmission System 25 circuits out of service and requiring major repair Portageville 71 (34kv) 30 miles long with 1 pole left standing 35 distribution substations without power 20 customer subs without power Distribution System 163 distribution circuits out of service

13 Supply Chain Issues Comparison: SEMO Ice Storm vs. Sept 14, 2008 Storm (Hurricane Ike) SEMO Ice Storm 36,000 customers out Outage duration: 9 days Major Material Installed 3800 poles 7000 cross arms 700 transformers 1,440,000 ft of wire (273 miles) Sept 14, 2008 Wind Storm (Hurricane Ike) 161,000 customers out Outage duration: 4 days Major Material Installed 38 poles 295 cross arms 58 transformers 69,000 ft of wire

14 Extreme Situations call for Extreme Measures Logistics Even if there would have been power, the existing logistics infrastructure in the region could not have handled the influx of resources Restoration Methodology Extensive Damage Recovery Method Restoration Island Concept Portageville kV Circuit (completely destroyed)—deployed three 2MVA generators Construction Standards—take advantage of the situation to re-build to “old” circuits to “new” standards

15 Logistics 15,500 Hotel Room Nights 2300 Alternative Sleeping Arrangements—bunk trailers, dorms, etc 76,000 meals loads of laundry 44 buses

16 Extensive Damage Recovery Method Typical restoration method is to utilize Outage Analysis System to methodically restore orders from largest to smallest Due to extreme amount of damage, decision was made to use the Extensive Damage Recovery Method Subtransmission system was restored/rebuilt first Feeders were then restored beginning at the substation and working to the last meter

17 Restoration Islands The service territory in southern SEMO was divided into 8 separate “Restoration Islands” A management and support structure was developed for each Island and restoration resources were assigned based on specific need Material Staging sites were established for each Island Operational Conference Calls were held every afternoon to discuss issues and manage resource and material allocations

18 Portageville kV Circuit 30 miles long with 1 pole left standing Provided power to 2 towns Decision was made early in the restoration process to rent large generators to provide temporary power to the 2 towns When all other circuits had been restored, resources were assigned to rebuild the Portageville 71 circuit Using 500 linemen, the 30 miles of 34.5 kV circuit was rebuilt in 3 ½ days

19 Lessons Learned It is impossible to prepare for every contingency The ability to adapt is critical Key Elements to Success Logistics—personnel resources are limited by the available logistics infrastructure Supply Chain—the flow of material into the affected area will affect restoration progress Incident Command Structure—ensured an integrated, organized response Restoration Work Islands—provided a manageable command and control structure in the field

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