River Data

Construction Data


Generation

Station Capacity





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 ---

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 Brookfield Renewable Energy Partners L.P. 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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