January 2009 SEMO Ice StormExtreme Measures

IEEE-PES St Louis Chapter MeetingJune 18, 2010

Presented byDavid Wakeman

Vice President, Energy DeliveryAmerenUE

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AmerenUE

Founded 1902 Serves 1.2 million

electric customers and 127,000 natural gas customers

21,000 square mile service territory

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Missouri Counties Served by AmerenUE That Were Affected

Cape Girardeau Dunklin Mississippi New Madrid Pemiscot Scott Stoddard

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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

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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

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Tuesday, January 27Day 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

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Wednesday, January 28Day 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

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Thursday, January 29Day 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

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Restoration Progress

Sunday Feb 1 Most 34.5 kV circuits restored Released 1st 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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SEMO Ice Storm%Customers Out by County

7.8%

97.7% 98.4% 99.6% 99.5% 94.5% 99.7%

0.0%20.0%40.0%60.0%80.0%

100.0%120.0%

Cape

Gira

rdea

u

Dunkli

n

Miss

issip

pi

New M

adrid

Pemisc

ot

Scott

Stodd

ard

Counties Served by AmerenUE

%Cust Out

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Percent of Customers Restored by DayCummulative

1% 6%17%

30%

48%60%

76%

94% 98% 100% 100%

0%20%40%60%80%

100%120%

01/2

7/200

9

01/2

8/200

9

01/2

9/200

9

01/3

0/200

9

01/3

1/200

9

02/0

1/200

9

02/0

2/200

9

02/0

3/200

9

02/0

4/200

9

02/0

5/200

9

02/0

6/200

9

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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

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Supply Chain IssuesComparison: SEMO Ice Storm vs. Sept 14, 2008 Storm (Hurricane Ike)

SEMO Ice Storm36,000 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

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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 71 34.5 kV Circuit (completely

destroyed)—deployed three 2MVA generators Construction Standards—take advantage of the

situation to re-build to “old” circuits to “new” standards

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Logistics

15,500 Hotel Room Nights

2300 Alternative Sleeping Arrangements—bunk trailers, dorms, etc

76,000 meals 1250+ loads of laundry 44 buses

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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

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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

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Portageville 71 34.5 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

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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

Questions or Comments?