The document summarizes Philadelphia Electric's investments totaling $160 million to upgrade their electric transmission and distribution system between 2005-2009. This included constructing new substations like Tuna, Waverly, Southwark, Tunnel, and upgrades to Schuylkill and Grays Ferry substations. The investments were aimed at ensuring reliability, and meeting the increasing energy demands in different parts of the city. Additional ongoing investments included replacing outdated equipment, relocating utilities, and aerial/underground distribution improvements across neighborhoods.

1. Philadelphia
Electric Transmission &
Distribution System
Investments
Behind the scenes at the facilities
that keep the lights on in the city
Summer 2009

2. Meeting the electric needs of
Philadelphia with new, rebuilt and larger
electric substations
$160 million in the city’s electric infrastructure to ensure
reliability for current and future energy demand
Tuna Substation in Northern Liberties (2005)
Waverly substation in Center City (2007)
Southwark substation in South Philadelphia/Navy Yard
(2008)
Tunnel substation in University City (Spring 2009)
Schuylkill & Grays Ferry tr substations in South
Philadelphia (Summer/Fall 2009)
These are part of a network of 20 electric substations that
make up the Center City transmission system
Near future: Penrose (2011) and Peltz (2013) substations
planned in near future
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3. New Southwark distribution
Substation
$18 million capital investment
Install new 69/13kV duplex substation adjacent to
existing substation
• New control house
• Two 62MVA 69/13kV transformers
• 13kV switchgear for 3 distribution busses
• 5 new distribution circuits
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4. Transformer Foundation Piles
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5. New Transformer w/ Firewall
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6. New Switchgear
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7. Tunnel Substation
$25 million capital investment
New 220/13kV - 62MVA substation
Located along Schuylkill River on University of
Pennsylvania campus
• Meet substantial new electric demand in University City
• Two (2) 62MVA 220/13kV transformers
• Eight (8) 13kV distribution circuits
− Ultimate capacity of 12 circuits
• Nine (9) MVAR capacitor bank
• Taps the 220-27 line between Parrish & Grays Ferry
• Benefits
− Relieves 40MVA load on facilities east of Schuylkill River
− Improved reliability in West Philadelphia
− Provides additional capacity to University City area
− Begins the retirement of Schuylkill 13kV substation
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8. Tunnel Substation – April 2008
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9. Tunnel Substation – Dec 2008
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10. Tunnel Substation – Boring Operation
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11. Tunnel Substation – North Bore Ducts
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12. 12

13. 13

14. 14

15. 15

16. 16

17. 17

18. 18

19. 19

20. Schuylkill & Grays Ferry
Transmission substations
$18 million upgrades to Schuylkill substation
• Major transmission supply for Center City
• Modernizes existing facilities
• Rebuilding electrical facilities on same site as existing sub
• Replace 12 69kV breakers, disconnects, insulators, and bus work at the
North and Center rings
• Install 4 new 69kV breakers to tie in with Grays Ferry
• Relocate controls from the neighboring generating station to newly
installed control houses (North and East yards)
$22 million Grays Ferry expansion
• Increased electric transmission capacity for improved reliability and
operational flexibility
• Install 230-kv/69-kv transformer
• Install new 69kV transmission line from Grays Ferry to Schuylkill Center
ring
• Install new 230kV breakers, upgrade existing breakers, and reconfigure
Grays Ferry bus into ring bus
Connect fiber optic rings
• Schuylkill and Grays Ferry & Waverly, Lombard, and Penn
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21. Schuylkill’s 69kV Circuit Breaker
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22. Disconnect Switch, Insulators & Bus
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23. New Breaker &Associated Bus Work
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24. Schuylkill Station Controls
Old and New
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25. 25

26. 26

27. 27

28. Grays Ferry
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29. 29

30. 30

31. 31

32. 32

33. Additional City Investments
$1.5 million replacement of automated switches for three
Center City distribution networks
Replacement of vacuum circuit breakers
• Multi-year commitment to replace outdated VCBs and install fiber
for enhanced communications and operations in Center City
$2 million for relocation of utility facilities for city’s South
Street Bridge replacement
• Relocation of manholes & ducts for construction
• Installation of ducts in new bridge
Aerial and underground distribution improvements in
Germantown, Overbrook, Mt. Airy, Chestnut Hill, Walnut
Street, Hunting Park
Planned retirement of Southwark, Delaware and Schuylkill
13-kv substations in near future (within five year plan)
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