Energy
Electricity and fuel consumption
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Implementing sustainability in design has the greatest potential to reduce energy consumption over the life of the asset as over a 50-year period, 95% of greenhouse emissions related to the project can occur during the operational phase. During the tender, several opportunities to reduce operational energy and GHG emissions, including renewables, were identified: Operational reductions
Construction measures and initiatives to reduce energy consumption include:
The Project has committed to purchasing 20% Green Power as the preferred method to meeting the renewable energy target (rather than generating solar energy). The Project recommended increasing its Green Power purchase commitments to ensure the 20% target was met, this contract is being renewed in Aug23 to which the green power will be increased for RIC + WHT. Project to date Green Power consumption across tunnel and surface works is currently tracking at 18.9%. There is a notable spike in Nov22, this was due to a large portion of unaccounted for energy (UFE) bringing down our consumption, green power is supplied outside of this factor so was not effected. It is estimated that 146,488,758 kWh of electricity has been consumed on the Project to date, of this 41,524,912.64 kWh was consumed during the review period. The Energy Model estimates that 291,563,000 kWh of electricity will be consumed during the construction phase of the Project. This figure includes electricity consumption of tunnelling machinery, tunnel lighting and ventilation during construction as well as site offices, crib sheds, and other onsite electrical plant and equipment, this figure obtained from the energy model has been updated to include the scope of WHT STW. During the review period, the number of operating road headers changed from 3 to 6 as all tunnelling resources have converted to WHT STW excavation, all road headers for this project are running. However, energy consumption from ventilation and lighting has increased as the expanse of excavated tunnel requiring ventilation and illumination has increased. The below tables illustrate the consumption of electricity and green power cumulatively and monthly, the second table illustrates monthly green power consumption. Electricity consumption on the Project PTD
Green Power Purchase Performance 2021-2022  Fuel
During the review period, a total of 3,096 kL of diesel and 18 kL of petrol was consumed on the Project for a combined fuel consumption of 3,114 kL. To date, 16,542.85 kL of fuel has been consumed. This equates to 62% of the forecasted estimate for fuel consumption. Monthly and cumulative consumption of Diesel and Petrol are presented below. This model has been updated to include the scope of WHT STW, this would have lowered the usage % due to the addition of works. Biodiesel is considered a greener alternative to pure diesel, with each 100L of B5 used emitting approximately 13.5kg of CO2 less than ordinary diesel and offers other safety benefits including reduced VOCs and a higher flashpoint. Bio-diesel has been implemented onsite, initially being delivered in a designated IBC for eligible plant. Since then, bio-diesel has been added into the main fuel tank for WHT, this allowing for it to be used in larger plant in a lower concentration than 5% and will not inhibit supply. 59,128L has been used within this review period. Monthly and cumulative consumption of Diesel and Petrol are presented in the graphs bellow. Fuel consumption on the Project - Diesel PTD  Fuel Consumption on the Project-Petrol 2021-2022
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