Investor Presentaiton

INFRASTRUCTURE FOR THE FUTURE TRANSGRID GROWTH OPPORTUNITIES (II) - - TransGrid shareholders continue to seek solutions to financeability issues raised with regulators 300 Trans Grid Indicative 5-Year Capex Profile (Proportionate) 282 Subject to Regulatory approvals Project EnergyConnect • (PEC) 250 200 E 150 EA 100 50 50 187 215 • EPC and other major commercial milestones complete Final CPA determination from AER expected Q2 2021 Disappointed in AEMC draft determination on financeability rule change, final due in Q2 2021 VNI West HumeLink . Ongoing landowner and community consultation QNI Medium □ CW REZ □ Humelink Central West REZ . 123 117 □PEC Non-Prescribed ■Prescribed • • Route being refined with proposed route to be published mid-2021 Regulatory process ongoing Community and landowner consultation has commenced The project is receiving funding from the Australian Renewable Energy Agency (ARENA) as part of ARENA's Advancing Renewables Program TransGrid is working closely with the NSW Government to plan new transmission infrastructure for the REZ Includes Snowy 2.0 connection Equity funding (1) 2021 $40m 2022 $100m 2023 $74m 2024 $40m 2025 $29m 1. Indicative Spark Infrastructure share of equity funding required for ISP projects (ISP funding assumed 40% equity/60% debt). Non-Prescribed and Prescribed growth capex to be funded at TGD level. Non- Prescribed connection pipeline ~12GW potential => $250m proportionate capex Further upside from NSW Energy Roadmap Demonstrated access to excellent financing terms Significant growth capital expenditure over the next 5 years on ISP major projects and non-prescribed connection assets Spark Infrastructure I Investor Presentation | February 2021 30

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