WA’s energy shift: Why flexible demand is becoming essential for grid reliability

Western Australia’s energy system is undergoing a significant transformation. As more businesses and households adopt renewable energy and battery storage to manage costs, the grid is becoming both more sustainable and more complex to operate.

Forecasts heading into the 2025–26 summer pointed to potential system stress. Higher-than-average temperatures and strong demand were expected to push peak load toward 4,600 MW, with risks of tight reserve conditions.

However, the summer that unfolded was milder than anticipated. Peak demand reached 4,221 MW on 2 February, which was high, but below record levels.

While conditions were less extreme, the underlying shift in the grid remains clear.

WA’s electricity system is becoming increasingly dynamic. Growth in rooftop solar, battery storage and flexible industrial loads is reshaping how and when electricity is consumed.

At the same time, demand patterns are evolving. Evening peaks remain critical, but their timing and intensity are becoming less predictable. Weather variability is also playing a greater role, adding further complexity to system operations.

In this environment, flexible demand is becoming an essential part of maintaining reliability.

Even during a milder summer, flexibility played an important role.

Through Enel X’s Capacity Charge Management program, customers responded to eight potential peak demand days. These events were driven by a combination of high temperatures, sustained evening demand and system forecasts.

By actively reducing load during these periods, participating businesses helped:

• Lower overall grid demand
• Ease pressure on the system
• Reduce capacity-related costs

This dual value, supporting both the grid and business outcomes, is exactly what flexible demand delivers.

As the energy system evolves, readiness is increasingly important.

Over the summer period, Enel X had more than 120 MW of flexible demand capacity available in WA, ready to respond when needed. This capacity will increase further throughout the year.

Flexible demand is not only about responding to events, but also about ensuring capability is available as conditions change. This is particularly important in a system where demand patterns are shifting, renewable generation is growing, and peak conditions are becoming less predictable.

The conditions leading into summer, and the resources secured to manage potential shortfalls, highlight a broader trend: reliability is no longer driven by generation alone.

WA’s grid is becoming more distributed, more dynamic and increasingly reliant on coordination across both supply and demand.

Flexible demand is already playing a critical role and is quickly becoming a core part of how the grid operates every day.