London Infrastructure Development Robert Kemp Head of System Development UK Power Networks Stephen Bradley Head of Major Connections UK Power Networks

Central Area Supergrid Substations

Central area supply network

EHV (132kV) network enhancements

Increased Resilience

Work in Progress

Additional Requirements Additional operational sites Continue and enhance co-operation in gaining new sites within new and existing developments that can feed out onto the network. Third party consents for tunnels, new sub-station works and modifications to existing operational sites.

Future: Calshot St Establish 132/11kV Substation

Future: Farringdon satellite 11kV switchboard

Wider EHV Network

Central EHV Network: Summary 860MVA of new transformer capacity by 2016 Matched by new National Grid supergrid exit capacity City of London supply diversity facilitated by the New Cross-Finsbury Market cable tunnel New resilient 33kV network to accommodate large point loads Planned new installations at Calshot St 86MW firm & Farringdon Further new substations being designed Further sites required, obtaining consents in a timely way.

33kV Network Delivery Dedicated Project Team to deliver the 33kV feeder infrastructure and dedicated services Frequent Client Liaison Including Progress Reporting Project Plans Spend Profiles Risk Management Close collaboration and assistance from CoL and TfL.

33kV network feeder spines

Central London – 33kV network Comprises of 3 new feeder groups Red Lights on Q3 2012, full functionality Q3 2013 Committed load, five customers, 59MVA Green Lights on Q4 2012, full functionality Q4 2014 Committed load, five customers, 63.2MVA Blue Osborn Street upgrade dependant, post 2017 Currently receiving enquiries 15

Red Route Progress Ducts and cables installed from Back Hill to junction of Camomile Street. Final jointing in progress to energise from Back Hill Switchgear for first customer has been manufactured - delivery and commissioned within the next two months. All switchgear has been ordered for the other customers. Final section from Camomile Street to Finsbury Market will be completed after the Olympics. 16

Green Route Progress Ducts installed from Great Sutton Street to Fan Street. Expected completion from Great Sutton Street through to Finsbury Market by August 2012. First two feeders to be live by end 2012 to connect one customer via temporary circuit breakers. The rest will be made live following the completion of the new switchboard at Finsbury Market July 2013. Excavation from Great Sutton Street to Back Hill to take place in 2013. 17

This excavation by Murphy Ltd in December 2010 was at the junction of Cheapside and King Street in the City of London and forms part of the Pinnacle 33kv route; as you can see there are many existing services present making trench excavation very difficult along with the installation of trench support prior to duct installation.

This excavation in Cheapside was adjacent to St Mary-Le-Bow Church and shows the additional trench support required for a deep excavation along with steel beams and nylon straps to support existing services. The excavation at this point was moving from the Westbound carriageway into the Southbound carriageway; a shallow bank of approx 30 telecoms ducts with a concrete surround was uncovered in the middle of the road; beside this was a large Water main followed by a large Gas main therefore the only space available for our new ducts (26 in total) was a 250mm gap below the exposed mains and just above the Victorian brick built sewer approx 3.5 meters deep. The trench had to be extended to approx 5 meters wide to create enough room for the ducts to be installed in a flat formation by 3.5 meters deep; an excavation of this size required a temporary works design and this section alone took approx three weeks to complete.

This excavation in Cheapside by Laing O’Rourke shows the four x 200mm and 6 x 89mm ducts for the Pinnacle 33kv scheme along with 16 x 11kv ducts installed as part of the One New Change scheme; the 4 x 200mm ducts laid flat in the trench are ready to be connected following the installation of a cement bound sand bed.

This section of work in Worship Street Hackney was completed by Compass Infrastructure (formally Nacap) and shows 200mm ducts installed for four separate 33 kv schemes, 4 ducts for the Pinnacle Tower (red route); two ducts to Bishops Place (Green Route); two ducts to the Interxion Data centre at Brick Lane and four ducts for the Blue route; the 89mm ducts for the pilot cables were installed shortly after; all 12 33 kv ducts have been surrounded by cement bound sand. Also noticeable in the photo each side of the 200mm ducts is a layer of very hard dark coloured aggregate which is believed to be the original 17th century road construction as confirmed by the Museum of London archaeologist who visits site on a regular basis.

This photo shows 24 x 500 metre drums of 33kv Copper cable recently delivered to our contractors Compass Infrastructure (formerly Nacap) and currently stored in Bishopsgate adjacent to the Pinnacle Tower; cable installation has now started and will continue into 2012. Compass did provide overnight and weekend security.