- Sri Lanka experienced a nationwide blackout triggered by grid instability issues linked to a sudden tripping of rooftop solar systems during a minor fault. - Rooftop solar systems lack advanced grid-supportive features such as ride-through capabilities, causing them to disconnect automatically during voltage fluctuations and dumping excess power into the grid. - As India scales up its rooftop solar capacity under schemes like PM-Surya Ghar, managing grid stability, frequency fluctuations, and intermittency becomes critical. - Lessons for India include mandating smart inverters, strict grid-code compliance, battery energy storage systems (BESS), and enhanced spinning reserves to handle high penetration of distributed renewables. - **Ceylon Electricity Board:** The state-owned electricity utility in Sri Lanka responsible for generation, transmission, and distribution, which faced severe criticism and operational challenges following nationwide grid blackouts linked to high rooftop solar penetration. **Introduction** Sri Lanka's nationwide blackout highlights the vulnerability of national grids to high penetration of unmanaged rooftop solar systems. The incident underscores critical lessons for India's massive renewable energy expansion, emphasizing the need for robust grid codes, advanced smart inverters, and storage systems to prevent cascading failures. **Core Issue and Detailed Points** - Sri Lanka experienced a nationwide blackout triggered by grid instability issues linked to a sudden tripping of rooftop solar systems during a minor fault. - Rooftop solar systems lack advanced grid-supportive features such as ride-through capabilities, causing them to disconnect automatically during voltage fluctuations and dumping excess power into the grid. - As India scales up its rooftop solar capacity under schemes like PM-Surya Ghar, managing grid stability, frequency fluctuations, and intermittency becomes critical. - Lessons for India include mandating smart inverters, strict grid-code compliance, battery energy storage systems (BESS), and enhanced spinning reserves to handle high penetration of distributed renewables. **Key Statutory Bodies, Acts & Concepts** - **Ceylon Electricity Board:** The state-owned electricity utility in Sri Lanka responsible for generation, transmission, and distribution, which faced severe criticism and operational challenges following nationwide grid blackouts linked to high rooftop solar penetration.