The Challenge of Renewable Energy Curtailment
India’s renewable energy sector faces a growing challenge: solar power can be in surplus during midday hours, while electricity deficits may still occur after sunset. This highlights an important issue in the transition to clean energy—generating enough renewable electricity over a day does not necessarily mean it will be available when and where it is needed.
In August 2026, the source snapshot used in Firstgreen’s analysis reported 668 MU of renewable energy curtailment, with solar accounting for 78.3%. Despite this curtailment, deficits persisted during non-solar hours.
These figures illustrate the gap between renewable energy generation and the ability of the power system to use that energy at the right time.
Why Does the Curtailment Paradox Occur?
The challenge is not simply a shortage of annual energy. It is a mismatch involving three key factors:
- Time: Solar generation peaks during daylight hours, while electricity demand and supply requirements may extend into the evening and night.
- Location: Renewable energy may be generated in one location while the demand or available transmission capacity is elsewhere.
- Flexibility: The power system needs sufficient storage, transmission capacity, and other flexible resources to balance supply and demand as conditions change.
Consequently, surplus renewable generation at one point in the day does not automatically resolve electricity shortages at another.
Can Battery Energy Storage Recover Curtailed Solar Power?
Battery Energy Storage Systems (BESS) can potentially shift surplus electricity to periods when it is more valuable or needed. However, not every curtailed megawatt-hour can be recovered economically or technically.
A practical assessment must consider several questions:
- Technical recoverability: Could the curtailed energy actually be captured and stored, given the underlying grid and project constraints?
- Storage duration: How many hours of discharge are required to meet the contracted service?
- Levelised Cost of Storage (LCOS): How does the cost of storing and delivering electricity compare with the value of energy during later hours?
- Power Purchase Agreement (PPA) design: Do the contract terms support the intended use of storage and provide a commercially viable allocation of risks?
These factors determine whether storage can turn otherwise curtailed renewable energy into useful, deliverable electricity.
Why Storage Is Not the Answer to Every Curtailed MWh
Although storage can improve renewable energy utilisation, installing batteries is not automatically the most effective solution for every curtailment event.
The underlying cause matters. Some constraints may require transmission improvements, better coordination, or other operational changes rather than additional storage alone. Even where batteries are technically suitable, their economics depend on storage duration, utilisation, charging opportunities, discharge requirements, and the value of electricity at the time of delivery.
The objective should therefore be to identify which curtailed energy can be recovered and whether doing so creates a technically feasible and commercially bankable solution.
Designing Bankable Flexibility
Firstgreen’s latest report examines the relationship between renewable curtailment, storage economics, and PPA design. Its analysis focuses on identifying technically recoverable curtailed energy, determining suitable storage duration for contracted services, comparing LCOS with the value of later-hour electricity, and understanding how contract structures influence bankability.
The central takeaway is that the opportunity lies not in storing every curtailed unit of electricity, but in developing flexibility that can be delivered reliably and financed commercially.
As India expands its renewable energy capacity, aligning generation, storage, grid infrastructure, and contractual obligations will be essential to making better use of clean electricity.
Explore Firstgreen’s Research
Understanding the curtailment paradox requires looking beyond annual renewable energy generation. The real challenge is matching electricity supply with demand across different times and locations while ensuring that the proposed solutions remain technically feasible and commercially viable.
The real opportunity is bankable flexibility.
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