Whalesbook
India’s rapid solar expansion is facing hurdles as over 40 GW of capacity lacks power purchase agreements, and transmission constraints have caused the wastage of 470 million units of green energy in early 2026. This supply-demand mismatch is driving up power purchase costs for state distribution companies and straining state finances. For investors, these bottlenecks raise questions about the long-term profitability of renewable projects, the need for advanced storage solutions, and the overall financial stability of the power distribution sector.
What Happened
India has seen record growth in renewable energy capacity, recently surpassing its 2030 targets for non-fossil fuel power generation ahead of schedule. However, this aggressive expansion is hitting significant technical and financial challenges. Data from early 2026 shows that 470 million units of green energy were wasted, or curtailed, because the grid could not absorb the power or demand was insufficient. A major part of this issue comes from transmission bottlenecks, which accounted for 300 million units of this wastage. Additionally, there are over 40 GW of solar projects that have been awarded but are still waiting for signed Power Purchase Agreements, or PPAs, which are essential contracts that guarantee the sale of electricity.
Why This Matters for Investors
The gap between installed solar capacity and the grid’s ability to use that energy creates a risky environment for power developers. When a project is built but lacks a signed PPA, the developer faces significant uncertainty regarding revenue. Furthermore, curtailment means that even if a plant is operational, it may not be allowed to sell all the electricity it produces, which directly lowers the project's return on investment. For investors, this situation highlights that capacity addition alone is not enough; the power must be deliverable and consumable for the business model to work.
Understanding Curtailment and PPA Risks
Curtailment is a technical term for when power generation is intentionally reduced because the electricity cannot be transmitted to where it is needed or because there is no one to buy it at that moment. The rush to build solar plants in renewable-rich regions, encouraged by waived transmission charges, has outpaced the development of the necessary grid infrastructure. When projects are built without a PPA, the developer takes on the risk that they might not find a buyer, or they might be forced to sell power at lower market rates. This makes projects harder to finance and increases the risk of debt stress for renewable energy companies.
Financial Pressure on the Power Sector
The rising mismatch between solar supply and demand is putting pressure on the finances of state distribution companies, or Discoms. As more renewable energy is added to the grid, the overall cost of the power system tends to increase. The average power purchase cost for Discoms has risen from ₹4.72 per unit in fiscal year 2021 to ₹5.38 per unit in fiscal year 2025. This rising cost trend makes it harder for Discoms to keep consumer tariffs low without government subsidies. If states are forced to provide larger subsidies to cover these costs, it can strain their fiscal health and their ability to pay power producers on time.
The Storage Challenge
To solve the issue of excess solar power during the day and shortages during peak evening hours, the industry is looking toward Battery Energy Storage Systems. However, this technology comes with a higher cost. A recent tender for peak hour renewable energy using battery storage discovered a tariff of ₹6.45 per unit, even with government support. This shows that while storage can solve the supply-demand mismatch, it currently makes renewable power more expensive, which may slow down the speed at which it can be adopted without putting further pressure on consumer prices.
What Investors Should Track
Investors should closely watch the progress of grid infrastructure projects designed to reduce transmission bottlenecks. The government’s ability to implement market-based mechanisms that compensate generators for curtailed power is another important factor. Future updates on the signing rates of Power Purchase Agreements for the 40 GW of pending capacity will be a key indicator of developer confidence. Additionally, investors should monitor the adoption of time-of-use tariffs and smart metering, which are aimed at shifting demand to daytime hours. Finally, any changes in policy regarding viability gap funding or government subsidies for storage solutions will be critical for understanding the long-term profitability of renewable energy developers.