How behind-the-meter storage is reshaping the energy market - Westpac IQ

Westpac's analysis finds that behind-the-meter battery storage is growing as a response to high grid electricity prices and peak-period volatility. Households and small businesses are installing rooftop solar with battery backup to reduce their reliance on grid power during expensive peak periods, reshaping energy consumption patterns and revenue flows in the National Electricity Market.

Where this fits

Behind-the-meter storage is a symptom of grid fragility, not a solution to it. When consumers bypass the grid for their own power security, it signals that the grid itself has become expensive and unreliable at peak times. This fragmentation redistributes cost: smaller consumers pay higher unit rates to support network infrastructure, while larger or wealthier households defect to self-supply. The root cause is a grid now dependent on weather-variable renewable output that requires either dispatchable firming (currently gas, expensively) or battery-scale storage (capital-intensive, China-supplied components, limited duration). A firm, dispatchable backbone, whether gas or nuclear, would flatten peak pricing and remove the incentive to fragment the market.

What it means

Australia is building a grid that pushes customers toward expensive individual solutions instead of affordable centralised generation. Each behind-the-meter installation represents a small admission that the wholesale market cannot reliably serve demand at reasonable cost. Westpac's data suggests this trend will accelerate, hollowing out revenue from the grid operators and incumbents while locking middle-income households into capital spending on imported battery technology. National energy security depends on a grid where electricity is reliably and cheaply supplied from firm, domestically-controlled generation. Distributed resilience is rational for the consumer; it is sub-optimal for the nation.