Transmission and distribution network upgrades will be required to support a transformed energy system
while many solar and wind projects have been developed in rural corners of the grid with limited capacity. This has caused bottlenecks and frustration for energy providers, while rule changes to protect system stability and encourage supply in more efficient parts of the grid have undermined the commercial outcomes of recent renewable projects. Policies to encourage generators in efficient parts of the grid can help to coordinate distributed supply more efficiently, but these types of reforms have proven difficult to land.
Just as Australia’s electricity supply and storage require an overhaul to deliver a low-carbon system, so too do the poles and wires moving electricity where it is required. Australia’s electricity grids were built and developed to support a system with relatively few centralised sources of power – mostly coal generators. The dramatic shift in where and how energy enters the grid and changing patterns of demand means much of Australia’s grid must be upgraded or expanded to meet consumers’ needs in the twenty-first century. Recent decades have seen rapid growth in intermittent renewable generation, rising from 0.6 per cent of supply in the NEM in 2006 to 19.4 per cent in 2020.28 The proliferation of rooftop solar – backed by government subsidies and generous feed-in tariffs – has created a two-way electricity relationship, increasingly feeding energy back into the grid through low voltage electricity lines. Rooftop solar accounts for 8.3 per cent of total annual supply across the country.29 These distributed energy resources have exposed the limitations of existing grid infrastructure, and technical challenges have been compounded by a lack of coordination. Energy market operators have struggled to understand how and when distributed sources of supply will come online,
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Decarbonising Infrastructure
Many of these issues have been ironed out over time, with work by AEMO through its Integrated Systems Plan (ISP) and the introduction of future Renewable Energy Zones (REZs) by a number of state governments having helped to better coordinate supply, prioritise grid upgrades and provide greater certainty for energy providers, customers and investors. However, limitations persist across whole regions such as the West Murray Zone.30 Greater coordination between energy market bodies, federal and state governments could utilise REZs as a more effective tool for managing demand and supply across the whole of the NEM. Similarly, reforms to simplify and accelerate planning and approvals of new transmission capacity could provide greater ability to address grid constraints before they emerge. Regulatory reform is also required to ensure investment made by regulated networks in the required transmission infrastructure is commercially-viable and can proceed with certainty. For now at least, the top priority for Australia’s energy bodies and market participants must be getting on with the energy transition. The focus of energy bodies and governments must be on the creation of an efficient, low-emission, affordable and reliable energy system, connected by a grid fit for our twenty-first century needs. Beyond efforts to support efficient investment in this system, introducing further major reforms now – when the market has already adapted to the vision laid out in the previous ISP and numerous other major plans and strategies by the energy market bodies – risks further delays and disruption at a time when Australia can least afford it. National leadership needs to empower energy market bodies to take accountability for the delivery of a decentralised, low-emission grid, ensuring market participants are able to attract the necessary capital and resources to make the transition.
