By Arvind Ananthanarayanan • Aniket Dharamshi • Vishrut Bubna
The global energy system is entering a decisive phase. Over the past two decades, renewable energy has moved from the margins to the centre of power generation, driven by falling costs, policy momentum and the imperative to decarbonise. Solar and wind are now the fastest-growing sources of new capacity and, in many markets, the most economical option for incremental generation. This Deep Dive examines the consequences of rapid renewable integration and the growing gap between capacity addition and grid readiness. While progress has been significant, power systems are not fully prepared to reliably absorb and manage renewables.
The defining constraint in the next phase of the energy transition is no longer generation capacity — it is system resilience.
Renewable electricity is variable, geographically dispersed and predominantly inverter-based. These characteristics change how grids behave, how stability is maintained and how supply and demand are balanced. As penetration rises, responsibilities shift from generators to transmission networks, distribution systems, storage and digital controls. The grid evolves from a unidirectional delivery mechanism into a complex system that must actively manage power and risk.
Recent disruptions — including the Texas blackout of 2021 and the Iberian outage of 2024 — demonstrate how low inertia, limited interconnection and insufficient flexibility can trigger cascading failures. The lesson is clear: rapid renewable deployment without parallel investment in grid strength, forecasting, storage and operational readiness increases economic and social risk.
India now stands at a similar inflection point. Accelerated renewable capacity additions, particularly in Rajasthan and Gujarat, are outpacing evacuation infrastructure. Transmission bottlenecks, curtailment and distribution-level fragilities are raising system costs, compounded by the financial stress of DISCOMs.
Comparing renewables and conventional power solely on generation cost misses the full picture. While renewables reduce fuel costs and emissions, they require sustained investment across transmission, distribution, storage, digital monitoring and institutional reform. The transition will succeed not by adding capacity alone, but by building systems capable of operating securely under higher variability.
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