London Power Tunnels Phase 2 · Transition modelFACILITY

As an underground cable tunnel network (20.2 km² footprint reference, National Grid, 100% owned) beneath South London, GB, this asset's dominant dependency is grid electricity for ventilation, pumping and monitoring systems rather than direct water withdrawal, yet it sits within the North Sea watershed which carries a High (40-80%) baseline water stress label (BWS score 3.38) and a drought score of 3.31, both materially above the site's Low overall composite risk score of 0.64. Current grid carbon intensity for GB is 217.41 gCO2/kWh (Ember 2025), setting the Scope 2 baseline against which any electricity-linked impact from this facility is measured; riverine flood exposure is modest (1.03) and coastal flood exposure is nil.

No location-specific flow data (water withdrawal, energy consumption) is populated for this facility, so quantified 2030 dependency shifts cannot be derived from site records; the dataset's own 2030 grid horizon score of 100 is inconsistent with the 2025 observed value of 217.41 gCO2/kWh and the 2050 score of 30, suggesting either a placeholder or a data quality issue that should be verified before use in decision-grade LEAP analysis. What is clear directionally is the UK's committed decarbonisation pathway (IEA WEO 2024 STEPS) reducing grid carbon intensity toward 2050, while the water-stress and drought pressures in the North Sea watershed remain unchanged in the absence of updated 2030 water horizon figures."

By 2050 the UK grid intensity horizon score falls to 30, reinforcing a durable decarbonisation trajectory for any Scope 2 exposure tied to tunnel ventilation, pumping, or auxiliary electrical loads, and this asset carries no coastal flood exposure (score 0) and modest riverine flood exposure (1.03), limiting residual physical risk over the long term. The principal unresolved variable is water: with no 2050 or 2080 depletion/stress horizon scores available, the trajectory of the North Sea basin's already-High baseline stress rating cannot be independently confirmed, leaving a monitoring gap for an asset class (underground cable tunnels) that is not itself water-intensive but sits within a constrained regional water system relevant to broader group infrastructure planning."