Blackstone, IFM Investors lob bids for Rio Tinto’s $7b power assets - AFR

Rio Tinto is fielding bids for its $7 billion portfolio of power assets, with Blackstone and IFM Investors among the contenders. The assets include wind and solar farms, as well as gas-fired generation serving mining operations across Australia.

Where this fits

This sale crystallizes the cost problem hiding inside the renewables transition. A $7 billion valuation for a mixed portfolio of wind, solar and gas reveals that Australia's grid is not simply adopting cheap renewables: it is bundling them with expensive gas firming, all of it privately owned and priced into every kilowatt-hour. The portfolio's gas assets are essential precisely because the wind and solar are weather-dependent. The buyer premium reflects that the whole system, not the panels alone, costs money. This is the real-world proof that renewable capacity is cheap per megawatt-hour, but a renewable grid is not cheap per megawatt of reliable power.

What it means

Rio Tinto's decision to divest reflects the economics of mining-grade reliability: the company needs firm power and has decided to buy it from the market rather than own it. That choice transfers the cost and the complexity, balancing renewables with gas, managing transmission constraints, hedging fuel and grid volatility, to financial buyers and ultimately to grid users. Australia's ban on nuclear power means there is no low-emission, firm, domestically-controlled alternative. The grid will continue to rely on gas as the firming backbone, locked into private ownership and rising fuel costs, while China owns the solar and battery supply chain that underpins the renewable half. The $7 billion transaction is a marker of the cost of that dependence.