Australia’s dependence on gas generation during evening energy peak falls by almost 70% - The Guardian

Gas generation's contribution to Australia's evening peak demand has fallen from roughly 40% to around 12% over recent years, driven by a surge in rooftop solar capacity and battery storage. The shift reflects a real decline in the marginal need for gas at that particular window, as distributed solar generation extends into early evening and household batteries discharge to meet demand.

Where this fits

This is a genuine win for grid flexibility and a real reduction in gas burn during peak hours. It shows that solar plus storage can genuinely displace gas in specific, high-value windows. But the headline obscures what has not changed: Australia still needs firm generation to back the grid on cloudy, low-wind days, and the headline metric, evening peak gas use, is a narrow slice of the whole-system problem. The real question is whether the cost of achieving this 70% fall (rooftop solar, batteries, network upgrades, and increasingly expensive grid-scale storage) has been counted honestly, and whether the remaining firm power is sufficient.

What it means

Australia's grid is now more weather-dependent, not less. The fall in gas use at peak tells us solar and batteries are working in their best-case window. It does not tell us how the grid performs when solar output collapses across a high-pressure system in winter, or how often gas (or imports from coal-heavy states) must ramp hard to fill the gap. The electricity transition is proceeding; the question is whether the whole-system cost, transmission overbuild, battery cycling costs, Chinese supply-chain dependence, and the firm generation that still must be there, has been counted. A nuclear alternative, banned by law, would have delivered firm evening capacity without weather risk or strategic dependence.