Australia’s fuel security hedge is electrification. It will only work with long-duration storage

But electrification only works as an energy security hedge if electricity can be supplied continuously through stress events. Replacing imported fuels with electricity shifts the vulnerability from shipping lanes to the power system. If the grid cannot supply firm power through multi-day lulls in wind and solar output, electrification becomes a new dependency replete with its own weak points, rather than a robust security strategy.

This is where long-duration electrical storage (LDES) matters. Its primary economic role is insurance: storing energy in periods of renewable abundance and releasing it when generation is low, or the system is under stress. In effect, LDES allows renewable electricity to perform the same role that fuel inventories have long played, turning intermittent sources of energy into dispatchable supply.

Australia has made a strong start on renewable generation and electrification, but the next phase is harder. Network constraints, connection delays, social licence and financeability of infrastructure through revenue certainty are now the biggest barriers to grid infrastructure development. This is particularly true for assets that provide resilience rather than daily trading returns. Investment momentum has slowed where it matters most: in grid firming and network capacity required to run a highly electrified economy reliably.

This is both unfortunate and unnecessary, because Australia’s advantage is real. Our solar and wind delivers low-cost electricity at scale. A real economic imperative remains to accelerate renewable deployment and electrify demand. Every electric vehicle, train or truck that replaces a diesel counterpart reduces exposure to external price shocks and supply risk. But reliability is a portfolio outcome. It depends on transmission that unlocks geographic diversity, demand response that can shift load, system services that keep the grid stable, and firming assets that cover variability across different timescales.

Short-duration batteries have been and continue to be built across the country. They are essential for fast response and peak support. But batteries are simply not built – or priced – to cover shortfalls over multiple continuous hours in a day or over many days, which is more consequential as electrification makes continuous supply non-negotiable.

LDES is the gap in that portfolio. It supports higher renewable penetration, reduces reliance on fossil-fuelled peaking. Many long-duration storage technologies offer long operating lives, lower degradation and sustained energy delivery, and can be especially valuable in constrained regional parts of the network where disruption is amplified. Yet, deployment remains limited despite its strategic importance and clear recognition of its need.

The constraint is economic. For batteries, duration and cost are tightly coupled. A four-hour battery can be paid for through existing AEMO energy-only electricity market signals, since these are primarily focused on hour-by-hour needs. But extending duration of batteries largely means doubling-down on the most expensive components – the cells-along with associated enclosures, cooling, and safety systems. Moving from four to eight hours, and again from eight to 16 hours, despite the clear grid benefits this duration would provide, means paying close to double each time. Batteries therefore become an increasingly expensive way to insure against rare but system-critical events.

True LDES technologies are structured differently because they decouple capacity from energy. The equipment that determines power output does not need to scale one-for-one with stored energy. Once the power block is built, duration can often be extended by increasing the storage medium itself, delivering additional hours of firm supply at far lower marginal cost.

The need for LDES is not in dispute. AEMO has consistently identified the requirement for deeper and more diverse storage as coal retires and renewables scale. The constraint is institutional as much as technical. The very beneficial characteristics of LDES technologies described above also mean higher upfront capital requirements, longer development timelines, and more complex financing structures. Their revenue profiles do not align well with energy-only wholesale markets.

Those markets work well in normal conditions. But they are poor at valuing long-term resilience – assets that may operate infrequently but are critical when the system is under stress. This leaves large system benefits unpriced and investment predictably undersupplied.

Policy-makers are beginning to respond. Capacity mechanisms, long-duration storage targets and reliability frameworks are emerging at state and federal level. But consistency matters. If resilience is the objective, institutions that support innovation and early deployment need clear guidance on how to value security, reliability and long-term system benefits alongside cost and emissions.

This is not an argument for abandoning discipline or writing blank cheques. It is an argument for recognising that value takes multiple forms and in a highly electrified economy, resilience has economic value. If government wants private capital to build assets that markets systematically undervalue, it must provide support in a way that is contestable, time-limited and designed to crowd in investment, not replace it.

Australia already has tools built for this purpose. The Australian Renewable Energy Agency (ARENA) is one such example, and there are many others like the Clean Energy Financing Corporation and state-level agencies being established to fill financing gaps. ARENA was established to accelerate emerging technologies by reducing early project risk and unlocking learning-by-doing that lowers costs over time. That is its comparative advantage. A modest but important adjustment is needed: an explicit mandate across these agencies to support energy-security-enabling technologies, with prioritising solutions where markets will not move first.

In an era of recurring geopolitical disruption, energy security is no longer a comforting assumption. Electrification is the structural hedge against imported liquid fuel risk – but only if electricity itself is reliable. Long-duration storage is what turns abundant renewables into dependable power. Failing to invest in it is not prudence; it is simply choosing a different, more fragile dependency.

Author: Sara Taylor, Senior Director Regulatory and Government Affairs, Hydrostor

The views and opinions expressed in this article are the author’s own, and do not necessarily reflect those held by pv magazine.

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