​Building bridges: On India’s solar generation, battery storage

Why in News?

India recorded an all-time peak electricity demand of 256.1 GW on April 25, 2026, with solar energy contributing 21.5% of the afternoon electricity load — the highest ever contribution from solar power during peak daytime demand. However, despite rapid growth in installed solar capacity, solar contributed only around 10.8% of total daily electricity generation and almost negligible supply during evening peak hours after sunset.

This has intensified policy discussions on the urgent need for battery energy storage systems (BESS) to stabilise renewable energy integration and reduce curtailment of solar power.

UPSC Relevance

GS-II: Government Policies and Interventions, Climate Governance
GS-III: Energy Security, Infrastructure, Environment, Science and Technology, Climate Change, Renewable Energy Transition, Sustainable Development, Climate Resilience

India’s Renewable Energy Transition

India is undergoing one of the world’s fastest energy transitions.

The country has set ambitious targets:

• 500 GW of non-fossil fuel electricity capacity by 2030,
• Net-zero emissions target by 2070,
• Rapid reduction in carbon intensity of GDP.

Solar energy has emerged as the central pillar of this transition.

India’s solar installed capacity has grown rapidly due to:

• Falling solar tariffs,
• Government incentives,
• Large solar parks,
• International climate commitments,
• Domestic manufacturing push.

Rise of Solar Power in India

India’s solar share in installed electricity capacity has nearly doubled:

Major solar-producing States include:

• Rajasthan
• Gujarat
• Tamil Nadu
• Karnataka
• Andhra Pradesh

India is also home to some of the world’s largest solar parks, including:

• Bhadla Solar Park
• Pavagada Solar Park

The Core Problem: Solar Intermittency

Solar power generation depends entirely on sunlight availability.

This creates a major challenge:

• Solar generation peaks during daytime.
• Electricity demand often peaks during evening hours after sunset.

This mismatch is known as the “duck curve” problem in power systems.

As a result:

• Excess solar power during daytime cannot always be utilised.
• Evening demand continues to depend heavily on coal and gas plants.

Thus, installed solar capacity alone does not guarantee reliable electricity supply.

Understanding the Generation-Capacity Gap

A key issue in India’s energy transition is the growing gap between:

• Installed renewable capacity,
  and
• Actual electricity generation contribution.

Although solar forms nearly 28% of installed capacity, its actual contribution to total daily generation remains much lower.

Reasons include:

Limited Sunlight Hours

Solar plants generate electricity only during daytime.

Grid Constraints

Transmission bottlenecks limit evacuation of power from renewable-rich regions.

Absence of Adequate Storage

Excess daytime electricity cannot be stored efficiently.

Renewable Curtailment

Grid operators sometimes ask solar plants to reduce generation to maintain grid stability.

Solar Curtailment: A Growing Problem

India reportedly curtailed about 2.3 TWh of solar power during 2025.

This means electricity generated by solar plants was not utilised despite being available.

Why Curtailment Happens

Grid Stability Concerns

Electricity supply and demand must remain balanced in real time.

Lack of Storage

Without batteries, surplus power cannot be preserved.

Transmission Congestion

Insufficient transmission infrastructure prevents power movement.

Demand Mismatch

Midday solar generation often exceeds local demand.

Economic Costs of Curtailment

Curtailment creates significant economic inefficiencies.

Public Financial Burden

Power producers are often compensated even when electricity is not dispatched.

Investor Uncertainty

Frequent curtailment reduces project profitability and discourages investment.

Wastage of Renewable Energy

Clean energy that could reduce fossil fuel dependence goes unused.

Why Battery Storage is Critical

Battery Energy Storage Systems (BESS) allow electricity generated during sunny periods to be stored and used later.

This solves the intermittency problem.

Functions of Battery Storage

Time-Shifting of Electricity

Daytime solar energy can be supplied during evening peak demand.

Grid Stabilisation

Batteries help balance fluctuations in electricity frequency and voltage.

Peak Load Management

Stored electricity reduces stress on conventional thermal plants.

Renewable Integration

Storage enables higher renewable penetration without destabilising the grid.

Falling Battery Costs: A Positive Development

Battery storage economics are improving rapidly.

Reported battery storage tariffs declined significantly during 2025:

This decline is driven by:

• Global scale economies,
• Improved battery technologies,
• Growth of electric vehicle manufacturing,
• Expansion of lithium-ion production.

India’s Battery Storage Capacity Remains Limited

Despite growing awareness, operational battery storage capacity remains very small.

This remains inadequate compared to India’s rapidly expanding renewable energy base.

Policy Push for Energy Storage

The Union Government has initiated several measures to support storage deployment.

Viability Gap Funding (VGF)

Financial support for large battery storage projects.

Renewable Energy + Storage Tenders

Solar projects increasingly include mandatory storage components.

National Electricity Plan

Recognises storage as essential for future grid reliability.

Green Energy Corridors

Transmission projects to integrate renewable-rich regions.

Importance of Co-Located Storage

Experts increasingly recommend pairing solar plants with nearby battery systems.

Benefits include:

• Reduced transmission losses,
• Better grid stability,
• Reduced curtailment,
• Improved dispatch reliability.

This integrated model is becoming globally standard in renewable energy systems.

Link Between Climate Change and Energy Demand

The India Meteorological Department’s forecast of a below-normal monsoon adds urgency to the issue.

A hotter and drier summer leads to:

• Higher cooling demand,
• Greater air-conditioner use,
• Rising daytime electricity demand.

This is precisely when solar generation can contribute most effectively — provided adequate storage exists.

India’s Larger Energy Transition Challenge

India faces a complex balancing act:

Expanding Renewable Capacity

Rapidly scaling clean energy generation.

Maintaining Grid Reliability

Ensuring uninterrupted electricity supply.

Managing Affordability

Preventing excessive tariff burdens on consumers.

Achieving Climate Goals

Reducing fossil fuel dependence.

Storage systems are increasingly central to balancing all these objectives simultaneously.

Global Trends in Battery Storage

Countries such as:

• China
• United States
• Australia

have aggressively expanded battery storage alongside renewable energy growth.

Large-scale battery deployment has enabled:

• Greater renewable integration,
• Reduced grid instability,
• Lower dependence on peaking thermal plants.

India is now entering a similar phase.

Challenges in Expanding Battery Storage

High Upfront Costs

Despite falling prices, battery systems remain capital-intensive.

Dependence on Critical Minerals

Lithium, cobalt, and nickel imports create supply vulnerabilities.

Financing Constraints

Many renewable projects already face stressed finances due to low tariffs.

Technological Dependence

India still relies significantly on imported battery technologies.

Recycling and Disposal Issues

Battery waste management remains underdeveloped.

Strategic Importance for India

Battery storage is not merely an energy technology issue.

It is linked to:

• Energy security,
• Industrial policy,
• Climate resilience,
• Strategic autonomy,
• Manufacturing competitiveness.

India’s renewable transition cannot succeed sustainably without storage infrastructure.

Way Forward

Accelerate Large-Scale Battery Deployment

India must move from pilot projects to nationwide utility-scale deployment.

Integrate Storage into All Renewable Auctions

Future solar and wind tenders should include mandatory storage requirements.

Strengthen Domestic Manufacturing

Initiatives such as the Production Linked Incentive (PLI) scheme should support battery manufacturing ecosystems.

Develop Alternative Battery Technologies

Research into sodium-ion, solid-state, and flow batteries should be encouraged to reduce dependence on imported lithium.

Expand Grid Infrastructure

Transmission and distribution upgrades are essential for renewable integration.

Improve Renewable Forecasting

Advanced forecasting systems can reduce grid instability caused by intermittent generation.

Create Strategic Mineral Partnerships

India should secure long-term access to lithium and other critical minerals through international partnerships.

Encourage Distributed Storage

Residential, commercial, and community-level battery systems can reduce pressure on central grids.

Strengthen Regulatory Frameworks

Clear regulations for storage pricing, grid integration, and ancillary services are necessary.

Conclusion

India’s record solar contribution during peak daytime demand demonstrates the remarkable progress of its renewable energy transition. However, the widening gap between installed solar capacity and actual usable electricity generation reveals a deeper structural challenge.

Without large-scale battery storage, solar energy remains only partially effective in addressing India’s long-term energy needs. Curtailment losses, evening demand dependence on fossil fuels, and grid instability all underscore that generation capacity alone is insufficient.

Battery storage represents the missing bridge between renewable ambition and reliable electricity delivery. India’s energy future will depend not only on how much solar capacity it installs, but also on how effectively it stores, manages, and distributes that clean energy across time and geography.

Prelims Practice Questions

1. Consider the following statements regarding Battery Energy Storage Systems (BESS):

1. They help store excess renewable electricity for later use.
2. They can improve grid stability and frequency regulation.
3. They eliminate the need for transmission infrastructure.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Answer: (a)

2. Which of the following are major challenges associated with solar energy integration?

1. Intermittent generation
2. Grid balancing requirements
3. Lack of energy storage capacity
4. Dependence on critical minerals

Select the correct answer using the code below:

(a) 1 and 2 only
(b) 1, 2 and 3 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4

Answer: (d)

3. With reference to India’s renewable energy transition, consider the following statements:

1. Solar energy contributes a larger share to installed capacity than to actual electricity generation.
2. Renewable energy curtailment refers to underutilisation of available renewable power.
3. India aims to achieve net-zero emissions by 2050.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Answer: (a)

Mains Practice Questions

1. Discuss the importance of battery energy storage systems in ensuring the success of India’s renewable energy transition.
2. Despite rapid expansion of solar capacity, renewable energy curtailment remains a major challenge in India. Examine the reasons and suggest solutions.
3. “Solar capacity without storage is a half-built bridge.” Analyse this statement in the context of India’s energy security and climate commitments.
4. Evaluate the opportunities and challenges associated with large-scale battery deployment in India.

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