The Central Electricity Authority has issued draft rules requiring new large solar and wind projects to include battery storage starting July 1, 2027. This change aims to reduce energy waste but increases upfront project costs for developers. Investors will need to watch how these higher expenses impact future project margins.
The Central Electricity Authority (CEA) has proposed new rules that will change how renewable energy projects are built in India. According to the draft released by the regulator, all new ground-mounted solar and onshore wind projects commissioned on or after July 1, 2027, must include battery storage systems. This mandate is a significant step toward making the national power grid more stable as India continues to add more renewable energy.
The proposed rules require developers to install battery capacity equivalent to at least 10% of the project's total power capacity. The requirement will begin with a two-hour storage duration starting in mid-2027. This will increase to a four-hour duration for projects commissioned between July 2029 and June 2031. Additionally, the draft mandates that at least 15% of inverters and all battery power conversion systems in these projects must feature grid-forming technology. This technology helps control voltage and frequency, which is crucial for preventing blackouts as more renewable power enters the grid.
This move addresses a major problem in the power sector known as curtailment, which occurs when power generated by solar or wind farms cannot be used or stored and must be wasted. In the first quarter of the 2027 financial year alone, India recorded a curtailment of 8,133 GWh of solar energy. By requiring batteries, the government hopes to store this excess energy during the day and release it during peak demand hours, such as in the evening, rather than letting it go to waste.
For investors and companies in the renewable space, this mandate brings both structural changes and new challenges. The most immediate impact is a rise in the upfront money spent on projects. Adding battery systems and specialized grid-forming inverters will increase the cost of building new plants. If developers cannot pass these costs to the end consumers or power distribution companies (DISCOMs), it could put pressure on profit margins. There is also a reliance on imported components for battery manufacturing, which could lead to supply chain risks if domestic production does not grow quickly enough.
Another layer of risk involves the financial health of the distribution sector. Even with better grid stability, projects often face delays in receiving payments from DISCOMs. If the cost of building these battery-equipped plants is high, any delay in payments could strain the cash flow of renewable energy companies. Investors may want to track how these companies manage their debt levels and whether they can source efficient, cost-effective battery technology to meet these new standards.
The CEA has invited public comments on these draft rules until October 4, 2026. The final version of these regulations and the ability of developers to secure the necessary technology and funding will be the most important factors for the industry to monitor in the coming months.