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Program: HTP North CorridorPackage: All (5)Scenario: BaselineBoundary: A1-A5, B, C, D reported separatelyDataset: EC3 snapshot 2026-07-14Method: EN 17472 / TRACI 2.1
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LCCACarbon vs Cost
Carbon vs cost
Eight design options plotted against whole life cost, with the efficient frontier
Option space
BaselineRecommendedDominated
Circle size: capital cost
148k159k169k180k191k$404M$410M$417M$423M$429MEmbodied carbon, tCO2eWhole life cost, NPVBaseline 184,620 tCO2e $412.8MBaselineGGBS 50% lining 167,450 tCO2e $418.3MGGBS 30% plus optimised geometry 161,090 tCO2e $415.5MRecommendedLow carbon station box mix 176,880 tCO2e $411.4MStation mixElectrified plant fleet 172,310 tCO2e $421.9MReduced spoil haulage distance 180,240 tCO2e $410.2MFull package optimisation 154,320 tCO2e $424.6MFull optimisationExtended maintenance interval 183,110 tCO2e $408.9MMaintenance intervalDashed line: Pareto frontier, computed from the option set
Marginal abatement cost
Dollars per tonne CO2e avoided, ranked
Extended maintenance interval
1,510 tCO2e avoided
-$12 per tonne
Reduced spoil haulage distance
4,380 tCO2e avoided
-$4 per tonne
Low carbon station box mix
7,740 tCO2e avoided
$18 per tonne
GGBS 30% plus optimised geometry
23,530 tCO2e avoided
$89 per tonne
GGBS 50% blend
17,170 tCO2e avoided
$141 per tonne
Electrified plant fleet
12,310 tCO2e avoided
$214 per tonne
Full package optimisation
30,300 tCO2e avoided
$310 per tonne
Program shadow carbon price is $145 per tonne. 5 of 7 measures clear that threshold.
Marginal abatement cost curve
Bar width: tonnes abated  |  Bar height: cost per tonne
$310$145$0Shadow carbon price $145Extended maintenance interval-$12Reduced spoil haulage distance-$4Low carbon station box mix$18GGBS 30% plus optimised geometry$89GGBS 50% blend$141Electrified plant fleet$214Full package optimisation$310Cumulative abatement potential, 96,940 tCO2e across 7 measuresTeal bars below the zero line save cost and carbon together
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