Batteries start to drive up midday prices, outstripping the fall in evening peaks - Renew Economy

Battery deployments have begun raising midday electricity prices in Australia, with the peak wholesale price shift now offsetting the falls seen in evening peaks as solar generation floods the grid at noon. The dynamic reflects a fundamental market signal: batteries are being added faster than the grid can absorb the midday solar glut, and their discharge behaviour is bunching demand and price pressure into a narrower window.

Where this fits

This is a cost story that exposes a hidden bill in the renewables transition. Batteries were supposed to smooth price volatility, but they are instead concentrating it. The article does not quantify the net cost to consumers, but the midday price rise signals that the system is now carrying overcapacity at certain hours and underutilisation at others. This is a marker of mismatched infrastructure: too much solar for the available storage, and storage that is economically rational only if it can charge and discharge within a narrow, high-price window. It points to the firm-power problem. Firm dispatchable sources flatten demand across the day; weather-dependent sources with batteries create peaks and troughs that force system-wide overbuild.

What it means

Australia is discovering in real time that a high-renewables grid does not simply replace thermal plant one-to-one. It requires both overgeneration (to fill storage in poor weather days) and overbuild of storage itself (to carry that overgeneration). Both carry real cost. A firm alternative, nuclear, would flatten this curve and reduce total infrastructure spend. Instead, the transition proceeds under legislative prohibition of that option, leaving the grid to absorb the full material and financial cost of the renewables-plus-battery path.