​The April 2026 NEM forecast reshapes our market outlook across multiple dimensions: how fast demand grows, how much coal retires, how fast batteries scale, and where spreads peak and compress. In turn this impacts the economic outlook for BESS, especially which states and durations are optimal and for which commissioning year. These are the main strategic decisions for new investors.

These dimensions hit on staggered timelines. Coal exits widen spreads to a 2030 peak. Storage scale-up compresses them through the late 2030s. The duration shift to 8-hour BESS lands around 2037. A project's economics depend on where in this sequence it lands.

This article tracks how those input revisions reshape NEM dispatch, BESS spreads, and the optimal duration through 2050, and what each shift means for project commissioning year.

Key takeaways

• Australia's home battery rollout has exceeded expectations. The April 2026 forecast lifts 2030 capacity from 10.4 to 18.1 GWh (+74%).
• East-coast fuel markets diverged. Newcastle coal forwards rose 25-30% on tighter export markets, while Wallumbilla gas eased as capped LNG export capacity decoupled east-coast gas from global signals.
• 4-hour spreads peak in 2030, then compress 25-50% by 2035 in NSW, South Australia and Victoria as household storage scales; Queensland holds flat through 2040.
• 8-hour BESS overtakes 4-hour on per-MW revenue from around 2037, driven by household and grid-scale batteries flattening the daytime peak.

Commodity prices and home batteries drive the April 2026 revision

Two input changes account for most of the revision between February and April. Newcastle coal forwards rose 25-30% on tighter export markets, lifting near-term wholesale prices. The home battery subsidy lifted the 2030 installed capacity forecast 74%, compressing late-2030s spreads. Wallumbilla gas, the CIS and LTESA procurement pipelines, and the coal retirement schedule moved less. These shifts set the demand and supply backdrop for the decade ahead.