- The combination of PV and ESS strengthens the power grid and directly addresses bottlenecks.
- Integrating PV and ESS enhances flexibility, boosts energy security, and accelerates the global energy transition.
The Global Solar Council (GSC) has warned that the world faces a decisive moment in the energy transition. Although solar power (PV) and energy storage systems (ESS) are expanding rapidly, ageing grid infrastructure and outdated market rules remain the most significant barriers. Without reform, these issues will continue to limit renewable energy growth.
Over the last decade, the costs of PV and ESS have fallen sharply, making them some of the most competitive energy technologies. PV modules cost around $0.09 per watt in China, while ESS battery prices have dropped to $0.04 per watt-hour. Despite this progress, challenges persist. In Europe, electricity prices sometimes fall into negative territory during midday solar peaks, discouraging investors. Across Asia, grid congestion and PV curtailment have become common, leaving new plants unable to connect.
Digitalisation and automation have boosted efficiency and introduced new risks, including cybersecurity threats that endanger grid stability. This makes integrating PV with ESS increasingly urgent. Short-duration batteries can shift excess solar power to evening hours, helping to smooth demand curves, improve flexibility, and strengthen reliability.
Practical examples highlight this shift. Sabah in Malaysia is building a 400 MWh ESS project to reinforce its grid. Uruguay has nearly achieved complete reliance on renewables through smart investments and interconnections. In Nigeria, distributed PV plus ESS systems are replacing diesel generators, cutting costs and providing cleaner energy.
These cases show how PV and ESS are redefining power systems. Traditional centralised grids give way to decentralised, digitalised, and bottom-up energy flows. ESS is no longer supplementary; it has become a central pillar of stability.
The GSC stresses that nations leading grid upgrades and market reforms will secure the most competitive edge. Clean energy is not just an environmental solution but also a driver of growth, stability, and resilience. As more countries adopt ESS targets, expand interconnections, and explore new market designs, the global power system is set to become cleaner, more flexible, and more reliable. The key question is whether this transformation can advance quickly enough to meet urgent energy transition needs.