 Facts & Figures
The Susquehanna River watershed consists of 45.5% of the land area of Pennsylvania and 13% of the State of New York. It supplies 50% of the fresh water entering the Chesapeake Bay. |
River Data
Length
|
| From Lake Otsego, NY to Havre de Grace, MD: |
448 miles |
|
From Safe Harbor to Havre de Grace, MD:
|
32 miles |
|
Drainage Area
|
| Above the mouth of the river: |
27,500 square miles |
|
| Above Safe Harbor: |
26,117 square miles |
|
River Flow
One cubic foot per second (cfs) is equal to approximately 7.5 gallons per second or 450 gallons per minute
|
| Maximum Peak Hour (June 24, 1972): |
1,005,000 cfs |
|
| Minimum Daily Average (September 1964): |
2,000 cfs |
|
| Average Annual (1917-1996): |
37,500 cfs |
|
|
Construction Data
|
1929-1931
Units 1-7
|
1981-1986
Units 8-12
|
|
| Original Cost (project/land): |
$34 million |
$125 million |
|
| Work Started: |
April 1, 1930 |
April 12, 1982 |
|
| Final closure of dam: |
Sept. 29, 1931 |
--- |
|
| Power from first unit: |
Dec. 7, 1931 |
April 13, 1985 |
|
| Last unit in service: |
Oct. 14, 1940 |
April 12, 1986 |
|
| Rock excavation: |
2,300,000 cu. yds. |
--- |
|
| Structural Steel: |
20,000 tons |
1,000 tons |
|
| Reinforcing Steel: |
6,300 tons |
1,800 tons |
|
| Concrete: |
515,000 cu. yds. |
41,000 cu. yds. |
|
| Cement Used: |
730,000 barrels |
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|
| Railroad relocation: |
9.5 miles |
--- |
|
| Maximum construction workforce: |
5,000 |
400 |
|
Dam
|
| Type: |
Gravity |
|
| Height (Avg. river bottom to Operation Bridge): |
75 ft. |
|
| Length (including Powerhouse): |
4,869 ft. |
|
Lake
|
| Length: |
10 miles |
|
| Area: |
7,360 acres or 11.5 sq. mi. |
|
| Useable storage (top 17 feet): |
3,000,000,000 cu. ft. |
|
| Elevation of normal water surface above sea level: |
227.2 ft. |
|
| Approximate depth of water at powerhouse: |
63 ft. |
|
Spillway
|
| Total Length: |
1,810 ft. |
|
| Number of Gates - Total: |
31 |
| Double leaf regulating gates: |
3 |
| Flood gates: |
28 |
|
| Width of each gate: |
50 ft. |
|
| Clear width between piers: |
48 ft. |
|
| Height of flood gates: |
35 ft. |
|
| Depth of water on gate sill |
32 ft. |
|
| Discharge per gate (normal forebay): |
35,000 cfs |
|
| Total spillway discharge (normal forebay): |
1,120,000 cfs |
|
Powerhouse
|
| Height (Draft tube floor to top of coping): |
148.5 ft. |
|
| Length (Old-638 ft.)(New-373 ft.) |
1011.0 ft. |
|
| Width (Intake curtain wall to end of draft tube): |
188.0 ft. |
|
|
Generation
- In one day, at maximum output, Safe Harbor Hydroelectric power plant generates approximately 10-million kilowatt-hours (kWh) of electrical energy.
- In a year's time, the plant averages 1,088,950,400 kWh. This total is dependent on the yearly average of the river flow.
- Safe Harbor's total output is supplied to co-owners LSP Safe Harbor Holdings LLC and Constellation Power Source Generation, Inc. to supplement the power flow into the Pennsylvania-New Jersey-Maryland Interconnection (PJM)
- The power flowing from Safe Harbor is used primarily to meet peak demands for electricity.
- Continuous operation occurs when river flow equals or exceeds the plant's maximum water handling capacity. (110,000 cfs)
Station Capacity
| Effective Generation Capacity (kW): |
417,500 |
|
| Rated Main Turbine Capacity (hp): |
560,000 |
|
| Maximum Powerhouse Discharge (cfs): |
113,000 |
|
Main Power Transformers
Nameplate Rating & Data
|
| Number |
2 |
6 |
1 |
1 |
|
| High Voltage (Volts): |
66,000 |
230,000 |
230,000 |
230,000 |
|
| Low Voltage (Volts): |
13,800 |
13,800 |
13,800 |
13,800 |
|
| Frequency (Hertz): |
60 |
60 |
60 |
60 |
|
| Phases: |
3 |
1 |
3 |
3 |
|
| Capacity, self cooled (kVA): |
30,000 |
28,000 |
52,200 |
78,000 |
|
| Capacity, forced air cooled (kVA): |
45,000 |
42,000 |
69,600 |
104,000 |
|
| Capacity, forced air & oil cooled: |
--- |
--- |
87,000 |
130,000 |
|
Cranes
|
| Location |
Number |
Capacity |
|
| Spillway: |
1 |
200 tons |
|
| Spillway: |
2 |
150 tons |
|
| Intake Deck: |
2 |
50 tons |
|
| Generator Room: |
2 |
250 tons |
|
| Generator Room: |
1 |
10 tons |
|
| Transformer Bay: |
1 |
250 tons |
|
| Draft Tube Bridge: |
1 |
25 tons |
|
Hydraulic Turbines & Generators
Nameplate Rating & Data
|
| Number of Units: |
2 |
5 |
5 |
2 |
|
| Unit Nos: |
1 & 2* |
3 - 7 |
8 - 12 |
41 & 42 |
|
| Type of Turbine: |
Kaplan |
Kaplan |
Mixed Flow |
Francis |
|
| Rated Horsepower: |
42,500 |
42,500 |
52,500 |
3,100 |
|
| Rated Head (ft): |
55 |
55 |
55 |
55 |
|
| Rated Discharge (cgs): |
9,200 |
9,200 |
9,600 |
618 |
|
| Rated Speed (rpm): |
100.0 |
109.0 |
76.6 |
180.0 |
|
| Number of Blades**: |
5 |
5 |
7 |
15 |
|
| Diameter of Runner (ins): |
220 |
220 |
240 |
67 |
|
| Revolving Element (lbs.): |
934,000 |
696,000 |
580,000 |
--- |
|
| Water Thrust (lbs.) 55 ft. head: |
872,000 |
830,000 |
1,039,000 |
--- |
|
| Total Thrust (lbs.): |
1,806,000 |
1,526,000 |
1,619,000 |
75,000 |
|
| Type of Thrust Bearing: |
GE Spring |
Kingsbury |
GE Spring |
Kingsbury |
|
| Electrical Data Capacity (kVA): |
35,000 |
31,100 |
37,500 |
--- |
|
| Rated Power Factor: |
80-100 |
80-100 |
90-100 |
70 |
|
| Voltage (Volts): |
13,300 |
13,800 |
13,800 |
460 |
|
| Frequency (Hertz): |
25 |
60 |
60 |
60 |
|
| Phases: |
1 |
3 |
3 |
3 |
|
*For Railroad electrified service
A Frequency converter, No. 27-67, is available for conversion of power between 25 Hz and 60 Hz. This unit consists of a 31,250 kVA 25 Hz generator direct connected to a 29, 700 kVA, 34,900 HP 60 Hz motor.
**Kaplan runners have horizontal, adjustable, propeller shaped blades. Francis runners have fixed, vertical, curved blades (commonly called buckets) joined to circular bands around the top and bottom of circumferences. Mixed flow runners are somewhat similar to Francis runners, but have more spiraling blades without the bands. |
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