Solar and wind generation meet record 80% of power demand on Australia’s national grid

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Petra Stock

Rooftop solar alone generates more than half of all power used, as clear sunny days and low demand drive record-breaking surge.

Australia is the global leader in generating electricity from the sun. More than 4.3m Australian households now have rooftop solar, driving record amounts of renewable energy into the grid

Sunshine and wind met 80.4% of demand on Australia’s main power grid on Saturday, setting a new high bar for renewable electricity.

Solar panels on rooftops provided more than half of the power used in the national electricity market, the grid that supplies the eastern states, South Australia and the Australian Capital Territory, for 30 minutes around lunchtime. This was complemented by solar and windfarms, and a small amount of hydro (1%). Fossil fuels, coal and gas, contributed 20%.

The energy minister, Chris Bowen, said the milestone meant there was “more clean, cheap, sovereign energy powering our homes and businesses than ever before”.

“There’s a long way to go but expect more and more of these milestones in the future as Labor gets on with the job of the energy transition, and delivering real cost of living relief,” he posted on social media.

Dr Dylan McConnell, an energy systems researcher at the University of New South Wales, described it as “record season” for renewables. Clear sunny days created good conditions for generating power, coinciding with low demand from heating and cooling. It was often the time when a year’s worth of new generation coming on stream was reflected in higher shares of renewable energy.

“These records are probably not going to last very long, they’re probably going to be broken in the next couple of weeks.”

There was more renewable energy than needed. Some of the excess was being stored by pumped hydro and batteries, and quite a lot of the surplus was curtailed, due to system security rules, network constraints and low prices. Coal generation in Queensland also hit a record low over the weekend, McConnell said.

While the renewables record was a sign of progress and illustrated that Australia was “marching towards a higher penetration renewable energy system”, it was not the main game in terms of emissions, he said.

“From an emissions perspective, what matters is the annual contributions and how much coal we are burning.” (Courtesy: The Guardian UK)

Solar and Wind Energy

How electricity is generated

Solar photovoltaic panels contain semiconductor cells that convert sunlight into direct current electricity. An inverter converts this into alternating current for household appliances and the electricity grid. Wind turbines capture energy from moving air through their blades, which turn a rotor connected to a generator. Output varies with sunlight, wind conditions and equipment capacity.

What the Australian record means

The reported 80.4 per cent contribution shows that solar and wind can meet a very large share of demand during favourable conditions. Rooftop solar alone supplied more than half of the electricity used during the reported lunchtime interval. This is a short period achievement rather than an annual average. Emissions reductions depend on how much fossil fuel generation renewables replace across the whole year.

Storing surplus electricity

Batteries store electricity as chemical energy and release it when needed. Pumped hydro uses electricity to move water into an elevated reservoir, then releases it through turbines to generate electricity later. Both involve energy losses but allow surplus generation to serve demand at another time.

Storage has two important ratings: megawatts, describing how quickly it can deliver power, and megawatt hours, describing how much energy it can deliver. For example, a fully charged battery with 400 megawatt hours of usable energy could supply 100 megawatts for approximately four hours.

Keeping the grid stable

Electricity supply and demand must remain closely balanced to maintain grid frequency, while voltage must also stay within operating limits. Advanced inverters, including those with grid forming capabilities, can help support stable operation as solar and wind supply increase. These controls require appropriate design and coordination across the network.

When electricity cannot be used, stored or safely transmitted, operators may reduce renewable output. This is called curtailment. More storage, stronger transmission connections and shifting flexible electricity use towards periods of abundant generation can help reduce it.

The lesson for Pakistan

Solar and wind development should proceed alongside grid upgrades, storage and efficient energy use. Planning should consider evening demand and periods of low renewable output as carefully as sunny midday conditions. The objective is reliable electricity with progressively lower fossil fuel consumption throughout the year.