India's renewable boom faces a critical test as coal remains the backbone of its power mix. Near Gujarat's salt marshes, Adani Green Energy is building what could become the world's largest renewable facility - scaling to 30GW by 2029. The company recently activated a 3.37 gigawatt-hour battery system, enough to power Goa for a day, marking a significant shift toward storage-enabled clean power.

Battery costs have plummeted more than half since 2022, making renewable-plus-storage competitive with coal for baseload power. NTPC, the state-owned utility, just tendered a 7.8GWh installation in Rajasthan - more than double Adani's current Gujarat facility. This follows India's first coal generation decline in over 50 years, though the IEA still projects 3% annual growth in coal demand.

Research from the India Energy and Climate Center shows solar-plus-storage now undercuts coal costs. Government targets 500GW non-fossil capacity by 2030, with 50GW installed last year. Analysts at CEEW estimate reaching 600GW could save $1.5bn in system costs while accelerating the peak of coal power generation. The technology shift represents a genuine inflection point for India's energy transition.

Despite ongoing legal challenges for the Adani conglomerate, including fraud allegations against founder Gautam Adani, the battery investment signals market momentum. Engineers prioritize reliability, but storage solutions now meet those demands while reducing emissions. India's clean energy ambitions just got more achievable.