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Mandatory Storage for Solar: A Necessity for Grid Stability

Introduction

India's grid stability is facing increasing risks as solar energy penetration grows. Recent cloud cover-induced dips in solar output have already led to grid frequency fluctuations, signaling a pressing need for energy storage solutions. With India targeting 300 GW of solar by 2030, a comprehensive storage mandate is crucial to prevent future grid crises.

Key Concerns:

• Solar Variability & Grid Fluctuations: Despite solar contributing only ~100 GW out of 450+ GW total installed capacity, February 2025 already saw grid stability issues.
• Government Advisory on Storage: The Ministry of Power’s recommendation for 10% or 2-hour battery storage for rooftop solar is a step forward, but advisories are not binding.
• Global Lessons – Germany’s Case: Germany’s experience with grid instability and renewable curtailment due to insufficient storage led to mandatory incentives for storage adoption.

Why Storage Should Be Mandatory?

• Prevents blackouts and curtailment by balancing intermittent solar generation.
• Supports grid frequency stability and ensures reliable power supply.
• Encourages investment in battery storage and pumped hydro solutions.

To successfully scale solar energy while maintaining grid reliability, India must mandate storage integration across utility-scale, C&I, and rooftop solar projects. Without immediate action, achieving the 300 GW solar target may result in grid management challenges that could slow down India’s energy transition.