TECHNICAL | BTS/CONCRETE
Waste disposal 1% Water use <1% Maintenance 1%
Electricity/fuel use 20%
Worker travel 1% Embodied carbon - materials 61% Transportation of materials 15%
Transportation of TBMs < 1% Transportation of plant/machinery < 1% Above, figure 4: Pie chart of carbon emissions by source – LPT-2 project, Package 2
LPT-2 PROJECT
The London Power Tunnels, Phase 2 (LPT-2) project is a £1bn investment by National Grid (NG) to ensure a continued safe and secure supply of electricity to London, by rewiring the capital via deep underground tunnels to house high voltage cables. It is a vital investment in the electricity distribution infrastructure to help keep Londoners connected to reliable supplies. The LPT scheme began in 2011 with Phase 1, which is
complete and runs across North London from Hackney to Willesden, carrying the power cables and infrastructure to meet around 20% of the capital’s electricity demand; stretched out, the cables would run all the way around the M25 motorway ring, encircling London. Works on LPT-2 began in Spring 2020, and will take around seven years to complete. It will run 32.5km of
Steel 3%
Sodium silicate additive 6% Soil 1%
Plastic <1%
3m-diameter tunnels and eight shafts across South London, constructed at an average depth of 30m below the road network. The tunnels run from Wimbledon to Crayford and the new power cables they will carry are to replace the present, end-of-life, oil-filled cables. The Hochtief-Murphy JV (HMJV) was awarded
Package 2 (Tunnels & Shafts) of LPT-2 in December 2019. HMJV took over the three drive sites within three months of award and a week after the covid lockdown was announced. The JV was later also awarded Package 5 (Headhouses and M&E). Close collaboration between the client (NG),
contractor (HMJV) and designer (Aecom) has ensured the programme has kept on track. Work was undertaken with four TBMs: one refurbished Lovat open face wedgeblock TBM, ‘Caroline’, in the West; and,
Other <1% Aggregate <1% Asphalt 1%
Aluminium <1% Cement 32%
Cementitious grout 2% Concrete 55%
Above, figure 5: Pie chart of embodied carbon by material – LPT-2 project, Package 2 20 | July 2023
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