Philadelphia Electric Transmission & Distribution System Investments

Behind the scenes at the facilities that keep the lights on in the citySummer 2009

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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 demandTuna 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 systemNear future: Penrose (2011) and Peltz (2013) substations planned in near future

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New Southwark distribution Substation

$18 million capital investmentInstall 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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Transformer Foundation Piles

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New Transformer w/ Firewall

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New Switchgear

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Tunnel Substation$25 million capital investmentNew 220/13kV - 62MVA substationLocated 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

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Ultimate capacity of 12 circuits• Nine (9) MVAR capacitor bank• Taps the 220-27 line between Parrish & Grays Ferry• Benefits

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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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Tunnel Substation – April 2008

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Tunnel Substation – Dec 2008

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Tunnel Substation – Boring Operation

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Tunnel Substation – North Bore Ducts

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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 busConnect fiber optic rings• Schuylkill and Grays Ferry & Waverly, Lombard, and Penn

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Schuylkill’s 69kV Circuit Breaker

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Disconnect Switch, Insulators & Bus

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New Breaker &Associated Bus Work

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Schuylkill Station Controls Old and New

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Grays Ferry

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Additional City Investments$1.5 million replacement of automated switches for three Center City distribution networksReplacement 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 ParkPlanned retirement of Southwark, Delaware and Schuylkill 13-kv substations in near future (within five year plan)