Supply-side capacity in the NEM over the next 10 years (v1)

Linton Corbet's ESOO capacity outlook for the next decade reorganizes the NEM's supply side into three service categories: bulk energy (large-scale wind and solar), shaping (batteries and hydro), and firming (thermal generation). The framework distinguishes between variable renewable capacity and firm, dispatchable supply, then maps committed projects and two development scenarios across these service types. Snowy 2.0 is noted as potential very-long-duration storage capable of firming, though it remains in development.

Where this fits

This framework surfaces the hidden architecture of the electricity transition: that a renewables-heavy grid cannot be measured by capacity alone, because variable generation and firm generation serve fundamentally different roles. The distinction between bulk energy and firming exposes the cost that headlines elide. A grid built on variable renewables requires a full stack of firming capacity and shaping assets to deliver reliable supply; those costs are separate from, and often larger than, the per-megawatt-hour cost of the panels and turbines themselves. The matrix reveals how much scheduled, firm supply Australia is actually deploying against its variable fleet, and whether that gap is being closed by gas, long-duration storage, or the prohibited alternative of nuclear.

What it means

The categorization is honest about what the grid actually needs to do: provide energy on demand, not just install capacity. Whether committed projects and development scenarios actually deliver enough firm supply to avoid chronic gas dependence over the next decade is the question the matrix can answer. If firming capacity is lagging the buildout of bulk renewables, Australia faces either a locked-in reliance on gas for the 2030s, or a grid stability problem. The framework makes visible what a renewables-only path requires: not just solar and wind, but sufficient dispatchable capacity to cover the weather cycles they cannot.