Study Shows Optimal Solar-Plus-Storage Sizing for Heavy Industry Operation

Development modeling reveals cost-effective path to 24/7 renewable energy for industrial giants

Heavy industry’s quest for decarbonization has long been hampered by the mismatch between constant production demands and the variable nature of renewable generation. Now, new research from the Australian National University (ANU) offers a detailed roadmap for integrating large-scale solar photovoltaics (PV) with battery storage to reliably power energy-intensive operations around the clock.

The reliability challenge for around-the-clock manufacturing

Sectors such as steel, aluminum, and cement run on uninterrupted power. Solar generation peaks midday and drops to zero at night, while industrial processes often demand a flat, high-load supply profile. Without storage or backup, this variability can halt production or force reliance on fossil fuels.

High-resolution techno-economic modeling

Using a non-linear net-load approach, the model co-optimized generation, storage, and consumption, incorporating weather variability and lifecycle performance decline.

• Grid interaction: Allowing import/export to the grid to balance surpluses and deficits.
• Industrial load flexibility: Shifting certain processes to periods of peak solar generation.

Key takeaway: cost drops ≠ maximum savings

According to the study, even aggressive cost declines for PV and batteries only reduced electricity costs by about 40%. The limiting factor was “energy spillage”—excess solar generation that could neither be used nor stored, forcing curtailment.

Operational strategies outperform cost cuts

These operational adjustments also reduced reliance on gas turbine backup, further boosting emissions reductions and resilience.

Implications for industry-wide decarbonization

This research reframes the solar-plus-storage conversation for heavy industry: the biggest efficiency gains come from smart integration and adaptive operations, not just cheaper hardware. For facility managers and sustainability officers, the message is clear—investing in operational flexibility and grid interactivity may yield better economic and environmental outcomes than waiting for technology prices to fall.

Next steps: from modeling to real-world deployment

The ANU team is now working directly with steel, aluminum, and cement producers to test these strategies in live industrial environments. These demonstration projects will validate the modeling under real-world conditions and help establish best practices for scaling renewable integration across the sector.

Actionable takeaways for industrial leaders

• Prioritize grid interconnection capabilities to capture value from surplus solar generation.
• Explore process scheduling adjustments to match renewable output peaks.
• Consider total system optimization—generation, storage, and consumption—over isolated cost-cutting measures.
• Evaluate lifecycle degradation impacts when sizing PV and battery systems.

Heavy industry can achieve 24/7 renewable power, but the path is not solely paved with cheaper panels and batteries. As the ANU study demonstrates, strategic operations and smart integration unlock the true potential of solar-plus-storage—delivering both economic savings and sustained decarbonization.