Over the next decade, plans are to build at least $65 to $85 billion in transmission lines across the east coast of Australia – more than tripling the value of the transmission grid. Transmission is essential for the energy transition, as renewable generation replaces ageing coal fired power stations that are nearing the end of life. But a $65 to $85 billion transmission build means the network charge on household electricity bills could rise by up to $600 a year, a 25% increase in total bills, as the investment costs are passed directly to consumers.

It’s not too late to take the steps that will minimise the cost to households and forge the path to more affordable clean energy future. To get there needs clearer accountability and responsibility in investment decisions for the transmission system, and to avoid repeating the mistakes that have seen huge cost blowouts on many large infrastructure projects.

Over the past two decades, Australia’s transport megaproject boom has reshaped cities, reduced travel times, supported economic growth and expanded the civil construction industry. However, this boom has come at a high cost. Australia currently has more than 50 transport projects valued at over $1 billion each under construction, with many significantly exceeding initial budgets. Despite the growth, capacity constraints – particularly in labour – have persisted, affecting project delivery. 

Australia is now entering a new phase, preparing for a major infrastructure boom in energy. As coal-fired power stations retire and emissions reduction efforts intensify, the focus is shifting from renewable generation to large-scale transmission projects, placing further pressure on an already constrained sector.