However, electrification can only serve as an energy security hedge through continuous power supply during stress events. Replacing imported fuels with electricity shifts vulnerability from the shipping lanes to the power system. If the power grid cannot provide stable power during periods when wind and solar energy output is low for several consecutive days, then electrification will become a new form of dependency with its own weaknesses, rather than a robust security strategy. 

This is the significance of long-duration energy storage (LDES). Its main economic role is insurance: storing energy during periods of abundant renewable energy and releasing it when power generation is low or the system is under pressure. In fact, LDES enables renewable electricity to play the role of a fuel reserve that has long existed, converting intermittent energy sources into dispatchable supply. 

Australia has made a good start in renewable energy generation and electrification, but the next stage will be more challenging. Grid constraints, grid connection delays, social licensing, and the realization of infrastructure's financiability through income certainty are currently the biggest obstacles to the development of grid infrastructure. This is especially true for assets that provide resilience rather than daily transaction returns. The investment momentum in strengthening the grid and increasing network capacity required for an electrified economy has slowed down. 

This is both regrettable and unnecessary, because Australia's advantages are real. Our solar and wind energy provide large-scale, low-cost electricity. Accelerating the deployment of renewable energy and the demand for electrification remains a genuine economic priority. Every electric vehicle, train, or truck that replaces a diesel vehicle reduces the exposure to external price shocks and supply risks. However, reliability is the result of the investment portfolio. It depends on the transmission that can leverage geographical diversity, the demand response that can transfer loads, the system services that maintain grid stability, and the reinforced assets that can cover variations over different time scales. 

Short-term batteries have been continuously constructed across Australia. They are crucial for rapid response and peak support. However, the design or pricing of batteries is not primarily intended to cover the gap for several consecutive hours or days throughout the day. And as electrification makes continuous power supply an imperative requirement, this becomes even more important. 

LDES is the gap in this investment portfolio. It supports a higher penetration rate of renewable energy and reduces reliance on fossil fuel peaking power plants. Many long-term energy storage technologies offer long operational lifespans, lower degradation, and continuous energy transmission, and are particularly valuable in areas with limited disruptions due to network interruptions. However, despite its strategic importance and the clear recognition of its necessity, its deployment remains limited.