India’s renewable sector faces significant energy curtailment due to grid infrastructure delays rather than excess capacity. With 8,133 GWh of solar energy wasted in Q1 FY26-27, the government has approved a ₹1.86 lakh crore corridor project to address connectivity. Investors should note the revenue risks for developers relying on temporary grid access.
India is grappling with a significant issue in its renewable energy sector: the inability to transmit power from generation sites to the grid. Contrary to concerns about excess generation capacity, the primary hurdle is a lack of adequate transmission lines. Data for the first quarter of fiscal year 2026-27 indicates that approximately 8,133 GWh of solar energy was curtailed, meaning this electricity could not be sent to the grid and was effectively wasted.
This infrastructure mismatch has created a challenging environment for renewable energy companies. A substantial portion of the sector, approximately 21 GW of renewable capacity, currently relies on Temporary General Network Access (T-GNA). This temporary access makes these projects highly vulnerable to curtailment during peak generation hours, as they lack guaranteed, permanent grid connectivity. Consequently, developers face significant revenue uncertainty, as their plants may be forced to shut down production when transmission capacity is unavailable.
Further complicating the outlook, nearly 50 GW of renewable energy projects are currently estimated to be delayed due to inadequate interstate transmission connectivity. These delays stem from various operational issues, including Right of Way (RoW) disputes, complex land acquisition processes, and a mismatch in timelines between when a renewable project is commissioned and when the corresponding transmission line is completed.
To address these systemic bottlenecks, the Union Cabinet recently approved the Green Energy Corridor Phase-III (GEC-III). This initiative, with an outlay of ₹1.86 lakh crore, aims to construct 135 GW of transmission infrastructure and 50 GWh of Battery Energy Storage Systems (BESS) by 2033. The government expects this expansion to provide the necessary grid buffer to accommodate rising renewable capacity.
The push for Battery Energy Storage Systems is also a strategic shift to manage grid stability. Currently, solar-heavy transmission lines remain underutilized during non-peak hours. By deploying batteries, developers can store excess energy during the day and inject it into the grid during evening hours, effectively increasing the utilization rate of existing substation infrastructure.
For investors, the primary risks associated with this sector are revenue volatility and potential debt servicing challenges for projects operating under T-GNA. While the new infrastructure corridor is a positive long-term development, the immediate monitorables include the commissioning timelines of these transmission lines and the adoption rate of BESS technologies. Investors may also track whether companies can successfully secure permanent grid access, as this is critical to ensuring stable cash flows and reducing dependence on temporary, high-risk access arrangements.