Ppl Corporation · NYSE:PPL
Ppl — Corporate Update (June 2006)
34 slides from Ppl's corporate update, Jun 28, 2006
Slide 1: PPL Generation, LLC Lake Wallenpaupack Operations During June 28, 2006 Flooding
PPL Generation, LLC Lake Wallenpaupack Operations During June 28, 2006 Flooding
Slide 2: Outline of Presentation
Outline of Presentation • Setting – Conditions in June • Storm Data – What was experienced • Storm Data – How it developed • Operations Summary – What we did and when • Overall Performance • Where do we go from here
Slide 3: Setting the Stage
Setting the Stage
Slide 4: Conditions in June
Conditions in June • Lake Level at Normal Elevation on Friday June 23rd = 1185.63 and falling. • June precipitation first three weeks – Normal • Drought Watch in effect in PA and NJ
Slide 5: PA and NJ drought watches in effect in late June
As of the last week in June, PA and NJ had drought watches in effect due to low ground water levels.
Slide 6: Storm Event Data - What was Experienced
Storm Event Data - What was Experienced
Slide 7: 3 to 8+ inches of rain fell on June 27th and into June 28th
3 to 8+ inches of rain fell on June 27th and Into June 28th in the western and northern portions of the basin after streams were already bankfull. This caused severe flooding.
Slide 8: Storm Total Rainfall
Storm Total Rainfall The heaviest rainfall occurred in the northern and western portions of the basin. The total rainfall for June 23-29 exceeded 15 inches in some areas. Nearly all non-tidal areas west of the Delaware River and north of Port Jervis received at least five inches. Doppler Radar Map P
Slide 9: Rain events compared to 100 year and 500 year events
7-8 Inches of rain – 100 Year event 15 Inches of rain – substantially more severe event – 500 year
Slide 10: USGS Peak Streamflow, Delaware River at Trenton
a USGS Peak Streanflow, in cubic feet per second 356668 366668 256668 266668 156668 166668 56666 USGS 01463500 DELAWARE RIVER AT TRENTON NJ Oo o 1955 - 1996 Q Oo O_o Oo fe: 9 8 9g 0% ° ° Oo, 6. oF o 9° o 7% ° o O60 Oo sd ® o o fe! oO .° o | 6} bo. ew. o% oO "FO, P ° ° oO o o o ba? 0° “6 o[ ® oO? oy
Slide 11: Storm Event – How it Developed and What We Knew and When
Storm Event – How it Developed and What We Knew and When
Slide 12: Thursday 6/22
Thursday 6/22 Slow moving tropical Depression was being watched along North Carolina Coast
Slide 13: Friday 6/23
Friday 6/23 Hawley 2-day QPF 2.34 inches THESE FORECASTS ASSUME A CONTINUATION OF PRESENT RESERVOIR RELEASES AND 72-HOUR QPF OF 2 TO 3.5 INCHES. OBSERVED RAINFALL DURING THE PAST 24 HOURS WAS GENERALLY UNDER 0.25INCH. CURRENT PROJECTIONS CALL FOR A PROTRACTED RAIN EVENT FOR AT LEAST THE NEXT 3 DAYS.
Slide 14: Saturday 6/24
Saturday 6/24 Hawley 2-day QPF 2.53 inches THESE FORECASTS ASSUME A CONTINUATION OF PRESENT RESERVOIR RELEASES AND 72-HOUR QPF OF 1.5 TO A LITTLE OVER 3 INCHES. OBSERVED RAINFALL DURING THE PAST 24 HOURS RANGED FROM 0.25 TO 1 INCH. CONTINUED WET WEATHER IS FORECAST FOR THE NEXT SEVERAL DAYS. THE BUL
Slide 15: Sunday 6/25
Sunday 6/25 Hawley 2-day QPF 1.57 inches THESE FORECASTS ASSUME A CONTINUATION OF PRESENT RESERVOIR RELEASES AND 72-HOUR QPF OF APPROXIMATELY 2 INCHES. ONLY LIGHT RAIN FELL IN THE UPPER DELAWARE BASIN DURING THE PAST 24 HOURS WITH MOST REPORTS UNDER 0.25 INCH.
Slide 16: Monday 6/26
Monday 6/26 Hawley 2-day QPF 1.47 inches THESE FORECASTS ASSUME A CONTINUATION OF PRESENT RESERVOIR RELEASES. QPF AMOUNTS OVER THE NEXT 48 HOURS RANGE FROM 0.75 TO 1.5 INCHES FROM EAST TO WEST. RAINFALL OVER THE PAST 24 HOURS RANGED FROM 1.4 TO OVER 3 INCHES. ADDITIONAL RISES TO 1/2 TO 3/4 FLOOD STA
Slide 17: Tuesday 6/27
Tuesday 6/27 Hawley 2-day QPF 2.79 inches THESE FORECASTS ASSUME A CONTINUATION OF PRESENT RESERVOIR RELEASES. QPF AMOUNTS ARE AROUND 2.5 INCHES. RAINFALL IN THE PAST 24 HOURS RANGED FROM 1.5 TO OVER 3.0 INCHES. MINOR FLOODING IS EXPECTED IN THE UPPERMOST DELAWARE BASIN AND LACKAWAXEN RIVER. 3/4 FLO
Slide 18: Wednesday 6/28
Wednesday 6/28 Total Precipitation amounts 6/23-27 were much more that predicted Hawley 7.5 inches Mount Pocono 15.3 inches
Slide 19: Operations Summary – What We Did and When
Operations Summary – What We Did and When
Slide 20: Key Actions-Events
Key Actions-Events • Sunday 6/25 – Lake at Normal Elev. = 1185.85 • Monday 6/26 – 2:00 AM Increased plant operating hours – 3:00 PM Reduced AR operations – 6:00 PM Removed AR, went to 24-hr full load operations (Lake El @ 1186.74) • Tuesday 6/27 – Noon Heavy rains being experienced. Notified County
Slide 21: Key Actions-Events (Continued)
Key Actions-Events (Continued) • Wednesday 6/28 – 1:00 AM Advised counties of spill in 2-3 hours – 1:00 AM to 2:30 AM Wallenpaupack Creek residents notified by PPL or Hawley Borough – 3:30 AM Initiated spill of 1400 cfs (Lake Elevation @ 1190.1 – water at top of gates, Hawley flow at 18,300 cfs, sta
Slide 22: Overall Wallenpaupack Project Performance
Overall Wallenpaupack Project Performance
Slide 23: Upper Delaware River Basin
Upper Delaware Walton 16.85 ft., 26,900 cfs River Basin 81.0 cfsm, 332 sq mi 0330, June 28 Margaretville 12.60 ft., 13,600 cfs 83.4 cfsm, 163 sqmi Hale Eddy 1015, June 28 19.1 ft, 40,100 cfs 67.4 cfsm, 595 sqmi 1300 hrs, June 28 Cooks Falls 20.54 ft., 62,400 cfs 258.9 cfsm, 241 sqmi 0900**, June 28
Slide 24: Corps of Engineers Reservoirs
Corps of Engineers Reservoirs Capacity Jadwin 8.0 bg Prompton 6.6 bg F.E. Walter 35.2 bg Beltzville 8.8 bg Blue Marsh 10.6 bg Stored in June ’06 Flood In (cfs) Out (cfs) Jadwin 5.6 bg Jadwin 13,600 3,500 Prompton 4.3 bg Prompton 11,100 3,500 F.E. Walter 24.6 bg F.E. Walter 23,000 10,000 Beltzville 4
Slide 25: New York City Reservoirs Maximum Inflow vs. Spill
New York City Reservoirs Maximum Inflow vs. Spill Reservoir Maximum Inflow (cfs) Maximum Spill Rate (cfs) % Cannonsville 36,800 (0330, 6/28) 33,100 (1200, 6/28) 10 Pepacton 30,300 (0900, 6/28) 19,700 (1700, 6/28) 35 Neversink 15,000 (0900, 6/28) 9,000 (1140, 6/28) 40 Accumulated storage above the sp
Slide 26: Lake Wallenpaupack Operations vs Downstream Flow Conditions
Lake Wallenpaupack Operations Vs Downstream Flow Conditions 6-25-06 to 6-30-06 40,000 Flood Stage Reduction due to 35,000 Lake Wallenpaupack = 3 Feet+ based on 19,500 cfs 4-hr peak 30,000 inflow estimate. 25,000 Flow (cfs) 20,000 15,000 10,000 5,000 0 6/25/06 12:00 AM 6/26/06 12:00 AM 6/27/06 12:00
Slide 27: June 2006 Event (Fourth Highest on Record)
Historical Crests •(1) 24.80 ft on 1955/08/19 •(2) 20.10 ft on 1942/05/23 •(3) 19.10 ft on 1936/03/12 •(4) 15.25 ft on 2005/04/3 •(5) 15.15 ft on 1936/03/18 Impacts •20.6 FLOODING OF THE LEFT BANK BEGINS AS SEEN IN THE AUGUST 19, 1955 FLOODING. •11.0 FLOODING BEGINS ON THE RIGHT BANK OF THE RIVER BO
Slide 28: Flow or Release at Time of Hawley Borough Peak Crest
Flow or Release (CFS per Square Mile) at Time of Hawley Borough Peak Crest - 2:30 PM June 28, 2006 600 Based on provisional USGS Data 517 500 Peak Run-off in Other Watersheds 400 300 200 168 145 100 100 85 54 51 42 0 Aldenville - Prompton Dam - Jadwin Dam - 1Hr Peak 4Hr Avg Peak Lake Other Basin - O
Slide 29: Where do we go from here?
Where do we go from here? • PPL re-evaluated operational procedures after the April 2005 event and made improvements to public notification. • Procedures will be reconsidered again to see what we can do to try to improve our flood operations consistent with our other obligations.
Slide 30: Why Not Lower the Lake During the Summer?
Why Not Lower the Lake During the Summer? • Lake would have to be lowered from El 1187.0 to 1183.0 to avoid spills during a 100-year flood. • Consequences – Substantial financial impact to recreation-based economy – Loss of Environmental uses – Loss of Power generation – Significant impacts to Delaw
Slide 31: Why Not Spill Earlier?
Why Not Spill Earlier? • Weather forecasts in days leading up to actual rainfall events are still highly uncertain. During June event rain totals far exceeded the forecasts. • Would have to release substantial volumes of water days earlier to have a “meaningful” effect on peak spills. Could seriousl
Slide 32: Flood Damage & Residual Issues
Flood Damage & Residual Issues • Flood of Record (1955) Spills – 19,500 cfs to 27,400 cfs depending on time of year • Wallenpaupack Creek – Old Mill Stream Inn – spills will continue to occur even if PPL is successful in making small changes to operations. Stabilization of foundation and creek retai
Slide 33: Wallenpaupack Creek Flow (Spill+Run-off)
Limit of Wallenpaupack Spill to Maintain Water Levels to Within the Channel of Wallenpaupack Creek 10000 9000 Wallenpaupack Creek Flow (Spill+Run-off -cfs) 8000 7000 6000 5000 Channel Capacity Limited by Roadway Bridge opening 4000 3000 2000 Channel Capacity Controlled by Lackawaxen River Backwater
Slide 34: Where do we go from here?
Where do we go from here? • Active Hurricane patterns being experienced since 1995 – risk of additional flooding late summer and fall. • PPL will continue to work with the DRBC and others as flood mitigation plans develop.