Investor Presentaiton

INFRASTRUCTURE FOR THE FUTURE REGULATORY REVIEWS Engage and advocate for outcomes that support returns required while delivering outcomes in the best long-term interests of consumers Review Objective Implementation AER Inflation Review Assess performance of inflation forecasting methodology and impact on returns 1 July 2021 AEMC Rules to improve financeability of Actionable ISP projects AEMC Rules to integrate DER Better match the cash flow from regulated revenue with the financing costs of Actionable ISP projects Allow two-way energy flows and charging for export Q2 2021 Mid 2021 AEMC Integration of storage in to the NEM Efficient integration of storage in to the National Electricity Market (NEM) Mid 2021 AEMC Ring Fencing review Improve the efficiency and effectiveness of ring fencing arrangements for distribution and transmission network service providers Late 2021 AEMC Regulatory Framework for stand alone power systems Allow customers to benefit from new technology that lowers costs of providing regulated services Late 2021 ESB Renewable Energy Zones (REZ) framework AEMO Integrated System Plan (ISP) Develop arrangements to support Renewable Energy Zones and interim implementation Efficient development of the National Electricity Market Late 2021 July 2022 AER Rate of Return Instrument (RORI) Sets out approach to estimate rate of return: return on debt, return on equity and value of imputation credits Dec 2022 AEMC Prior to 2025 AEMC Rules to facilitate system stability Coordination of Generation and Transmission Investment (COGATI) Access and Charging (1) ESB Post 2025 NEM Design Create new markets for synchronous services, reserve markets and ahead markets Better co-ordinate generation and transmission investment to improve the efficiency of dispatch and location of generators; provide certainty to support new investment and improve planning information Develop long-term, fit-for-purpose market framework to enable provision of full range of services to customers necessary to deliver a secure, reliable and lower emissions electricity system at least-cost (1) Now incorporated in to the ESB's post 2025 NEM Design program as Grid Access Spark Infrastructure | Investor Presentation | February 2021 2025 2025 26

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