Australia's renewable energy sector hit a milestone in 2025, supplying 43% of the country's power. But the Clean Energy Council's annual snapshot, released today, warns that investment in new large-scale wind and solar has dropped sharply — a slowdown that could keep electricity costs higher for longer, including for crypto miners eyeing cheap green power.
43% Renewables, but Investment Falls
The report shows renewable energy generation rose from 39% in 2024 to 43% in 2025, with the national grid crossing 50% in the final quarter. Australia also ranks third globally for utility-scale battery storage, behind only China and the US. Yet the council flags that spending on new wind and solar projects has "plummeted." The risk: without fresh capacity, the energy transition slows, and electricity prices — a key input for mining — may stay elevated.
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The Real Bottleneck Is Transmission, Not Projects
Most coverage focuses on project financing, but the actual choke point is grid connection. New transmission lines take five years or longer to build. Miners planning Australian operations often assume renewable energy will be available once built, but physical grid constraints mean even approved projects can't deliver power until the transmission is upgraded. That directly impacts site viability timelines — and could push costs higher for operators trying to lock in cheap power.
Battery Growth Decoupled from Renewable Expansion
Australia's utility-scale battery buildout is often portrayed as a sign of renewable progress. In reality, much of that storage is driven by coal plant retirements creating grid instability. The batteries are there to manage that volatility, not just to store solar and wind. For miners, this means electricity costs may remain tied to fossil-fuel backup rather than cheap renewables, especially as aging coal plants come offline and require balancing.
Winter Reliability and the Gas Crutch
The Q4 2025 renewable share above 50% is inflated by seasonal hydro (drought-recovered dams) and summer solar peaks. During winter, fossil fuels still supply more than 65% of power. Miners operating through Australia's winter months could face 20–30% higher electricity costs due to gas dependency — a detail buried in the headline numbers that undermines the "50% renewable" narrative.
The Clean Energy Council's warning is a signal for mining operators to look beyond national averages. Transmission upgrades, not project approvals, will dictate how quickly cheap renewable power reaches the grid. The next concrete step is watching for policy responses from Canberra, which could either accelerate transmission investment or let the slowdown deepen.
