Shelter Island
Substation
Town Meeting
July 8, 2014
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Topics for Today’s Presentation
• Continue the discussion held at the May 27th Town Meeting – Overview of Electric system, need and benefit of new substation on Shelter Island
– Substation Appearance and Landscaping
– Environmental Compliance
– Health and Safety
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Current Electric Facilities to Shelter Island
North Fork
Failed
Distribution
Cable
Originally 2 Pipes
Installed with 69 kV
cable across water
1 Used and 1 Spare
Distribution is now in
spare pipes
X
Distribution
In 69 kV Pipe
~ 11 MW
Capacity
Load ~ 13 MW
69 kV Cable
105 MW
Direct
Between
North and
South Forks
Distribution
In 69 kV Pipe
~ 3 MW
Capacity
South Fork
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Shelter Island Electricity Supply Customer Areas
3 Main Distribution Feeders
Red feeder from Southold Substation has failed, Blue is from Bridgehampton
Substation, Green feeder is remaining major source of electricity from Southold
Substation feeding customers in the red and green areas
Proposed Substation
Location
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What Happened?
• One of the two distribution supplies from North Fork failed in November 2012.
• Remaining cables supplying Shelter Island have adequate capacity to carry load on Island under normal conditions.
• Portable generators were installed last summer as back‐up only in the unlikely event of an additional cable failure.
• Portable generators have been re‐installed for this summer for the same contingency.
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Directional Drilling Unsuccessful
• After determining the failed cable could not be repaired, a plan was developed to install a new underwater conduit run from Southold to Shelter Island.
• A replacement distribution cable would then be installed in the new conduit upon completion of the drilling operation.
• This solution was determined at the time to be the quickest solution to restore Shelter Island to normal configuration. • Lowest cost option to meet expected needs.
• Directional drilling attempt was unsuccessful last year. 6
Where We Are Now
• After the unsuccessful drill attempt, it was determined that the installation of a new substation would provide the needed capacity for both short term and long term needs.
• This takes the uncertainty of a second drilling out of the picture to provide the residents with a permanent solution.
• Substation was planned to meet increased load on Shelter Island as well potential future failures but the availability of land near transmission cable for the substation was always a concern in the past.
• Preliminary discussions with the Town in identifying a suitable parcel that minimizes the visual impact of the station to the Island residents. • Location is adjacent to existing transmission and distribution lines, minimizing any other work on Shelter Island.
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Town Site
To North Fork
Potential
Substation
Site
69 kV Transmission
Line
To South Fork
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Benefits to Customers of a New Substation
• New supply required to meet current and future needs. • A new substation is best option going forward
– Minimal sized substation adequate to serve area load
– Property Requirements: 185’x210’ or about 1 acre with buffer
• Provides:
– Substation installation takes uncertainty of drilling operation out of the equation
– Electric capacity for current and future customer needs
– Long term solution for potential failures of remaining cables
– Elimination of risk of feeder failure on North and South Forks
– Local supply source with multiple feeders located on the Island
– Higher efficiency as it is closer to the customer demand
• In Summary substation provides higher reliability, and current & future needs of customers on Shelter Island
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Appearance & Landscaping
• The following slides show information on sample pictures of existing substations and the landscaping surrounding them.
• Note for the Shelter Island substation, the entrance and exit of the transmission line will be underground so there will not be any large takeoff structures or overhead transmission poles.
• The larger mast seen in the substation pictures are for lightning protection.
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LIPA Substation, Jamesport, NY
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LIPA Substation, Jamesport, NY
LIPA Substation, Jamesport, NY
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LIPA Substation, Jamesport, NY
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16
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LIPA Substation, Jamesport, NY
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Trees for Screen Plantings
Species
Max. Height*
Hardiness
Chamaecyparis pisifera (False Cypress)
Ilex opaca (American Holly)
Ilex pedunculosa (Longstalk Holly)
Juniperus scopulorum (Rocky Mountain Juniper)
Juniperus virginiana (Eastern Redcedar)
Picea abies (Norway Spruce)
Picea glauca (White Spruce)
Picea pungens (Colorado Blue Spruce)
Pinus flexilis (Limber Pine)
Pinus resinosa (Red Pine)
Pinus strobus (White Pine)
Thuja occidentalis (American Arborvitae)
Thuja plicata (Western Arborvitae)
50-60
15-30
20-30
30-40
40-50
40-60
40-60
30-60
30-50
50-80
50-80
40-60
50-70
Zone 3
Zone 5
Zone 5
Zone 5
Zone 2
Zone 2
Zone 2
Zone 2
Zone 2
Zone 2
Zone 3
Zone 2
Zone 5
* Maximum height under typical landscape conditions
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LIPA Substation, Jamesport, NY
Sample Tree Planting
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Sample Plantings
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LIPA Substation, Jamesport, NY
LIPA Substation, Deerfield, NY
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LIPA Substation, Deerfield, NY
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LIPA Substation, West Yaphank, NY
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LIPA Substation, West Yaphank, NY
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LIPA Substation, West Yaphank, NY
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Environmental Compliance
• Due Diligence
• Environmental Regulatory Review
• Freshwater Wetlands
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Due Diligence
• Phase I Environmental Site Assessment
–
–
–
–
–
Property visit/walk through
Environmental database review
Interview with persons of knowledge
Recognized Environmental Conditions (RECs)
About a 1 month process
• Phase II Environmental Site Assessment
– Confirm presence or absence of any RECs
– Environmental media sampling
– Generally 6 weeks or longer, depending on RECs
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Environmental Regulatory Review
• Identify required federal, state and local environmental review process
• Perform environmental review
– Including identification of required permits/approvals
– Generally about a 1 to 6 month process • Address environmental concerns
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Freshwater Wetland
• Fresh water wetland present on property
–
–
–
–
NYSDEC Recognized wetland
Perform delineation
Design to avoid wetlands impacts
Protect wetlands and any other identified sensitive environments during and after construction
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