Fleet Substation · Transition modelFACILITY

Fleet Substation is an HV transmission asset wholly owned by National Grid, so its core dependency is grid-connected electricity infrastructure integrity rather than direct water withdrawal, though it sits within the North Sea watershed, which carries a High (40-80%) baseline water stress score of 3.38 and a drought score of 3.31. The dominant impact channel is Scope 2 grid emissions, currently observed at 217.41 gCO2/kWh for GB (Ember Yearly Electricity 2025). Overall composite physical risk is rated Low (score 0.64), with zero coastal flood exposure and modest riverine flood scoring (1.03), indicating today's acute physical pressure is limited despite the elevated chronic water-stress backdrop.

Toward 2030, the data flags a grid carbon intensity horizon value of 100 gCO2/kWh, a steep drop from the 2025 observed 217.41 gCO2/kWh — a jump that is unusually large for a five-year window and warrants a data-quality check against the underlying IEA WEO 2024 STEPS pathway before it is used in transition-risk modelling. No 2030 water-stress or water-depletion horizon labels are populated in this record, so the forward view on physical water risk for the North Sea watershed remains a gap rather than a stable-and-benign signal. The substation's exposure profile is therefore asymmetric: transition-side data suggests improvement (with a caveat on the figure itself), while physical-side forward visibility is simply absent.

By 2050 the GB grid carbon intensity is forecast at 30 gCO2/kWh (IEA WEO 2024 STEPS), placing Fleet Substation's Scope 2-equivalent footprint near residual levels and largely closing the decarbonisation question for this asset class. What does not resolve on the same timeline is physical water risk: no 2050/2080 water-stress or water-depletion horizon scores are provided in this dataset, leaving the long-term trajectory of the North Sea basin's High stress rating (currently 3.39) unquantified. Given National Grid's role as critical transmission infrastructure, the residual risk to monitor past 2050 is basin-level water stress and drought recurrence rather than transition risk, which is well on track to de-risk.