Renewables expand toward 24/7 reliability as storage and flexibility reshape global power systems

A new report from the International Renewable Energy Agency finds that renewable energy is rapidly evolving beyond intermittent generation, with solar and wind increasingly supported by storage, digital systems, and flexible grids that enable near-continuous clean power supply.

The report, focused on what IRENA calls “24/7 renewables,” outlines how power systems are shifting from traditional fossil-based baseload models toward dynamic, distributed energy networks. These systems combine renewable generation with battery storage, demand-side management, and advanced grid infrastructure to deliver reliable electricity around the clock.

Solar photovoltaic generation remains at the center of this transformation. Over the past decade, solar has become the fastest-growing source of new electricity worldwide, driven by falling costs and widespread deployment. However, because solar output is tied to daylight hours, integrating it into reliable power systems requires complementary technologies.

IRENA emphasizes that battery storage is one of the most critical enablers. Utility-scale and distributed battery systems allow excess solar generation during the day to be stored and used during evening peak demand. This reduces reliance on fossil fuel peaker plants and stabilizes electricity supply.

The report also highlights the importance of flexible demand. Technologies such as smart grids, automated demand response, and electrification of sectors like transport and heating allow electricity consumption to better align with renewable generation patterns. For example, electric vehicles can be charged during periods of high solar output, helping balance the grid.

In addition, grid expansion and interconnection are key components of 24/7 renewable systems. By linking regions with different weather patterns and generation profiles, power systems can smooth variability in solar and wind output. This geographic diversification reduces the risk of supply shortages and improves overall system resilience.

IRENA notes that digitalization is playing a growing role in enabling these systems. Advanced forecasting tools, artificial intelligence, and real-time monitoring allow grid operators to predict renewable generation and adjust supply and demand more efficiently. These tools are essential for managing increasingly complex energy networks with high shares of variable renewables.

Despite the progress, the report identifies several challenges. Investment in grid infrastructure must accelerate to keep pace with renewable deployment. In many regions, transmission bottlenecks and slow permitting processes are delaying projects. Additionally, policy frameworks need to evolve to support flexible resources such as storage and demand response, which are not always fully integrated into existing electricity markets.

The report also underscores the importance of coordinated policy and market design. Governments are encouraged to adopt long-term planning strategies that align renewable expansion with grid upgrades, storage deployment, and electrification efforts. Without this coordination, the benefits of renewable growth may be limited by system constraints.

Overall, IRENA concludes that achieving reliable, round-the-clock renewable energy is no longer a distant goal but an emerging reality. With continued investment and policy support, solar and other renewables can form the backbone of modern power systems while maintaining reliability and reducing emissions.

The findings reinforce a broader global trend: renewable energy is not only expanding rapidly but also becoming more capable of meeting demand at all hours, positioning it as a central pillar of future energy systems.