Why in News?
- As India’s renewable energy capacity crossed 283 GW, accounting for approximately 53% of the total installed power capacity of 532 GW, concerns have intensified regarding inadequate energy storage infrastructure needed to balance intermittent solar and wind generation.
- The Central Electricity Authority projects that India will require 174 GW / 888 GWh of energy storage by 2035–36, including 80 GW of Battery Energy Storage Systems (BESS) and 94 GW of Pumped Hydro Storage (PHS).
Relevance
- GS Paper 3: Renewable energy, energy security, battery technology, and climate change mitigation.
- GS Paper 2: Energy governance, critical minerals, and industrial policy.
Practice Question
“Energy storage is the critical enabler of India’s renewable energy transition.” Discuss the opportunities and challenges in scaling up energy storage systems in India. (15 Marks, 250 Words)
Static Background
What is Energy Storage?
- Energy storage systems (ESS) capture surplus electricity generated during periods of high solar or wind output and release it when generation declines or demand rises, thereby maintaining a stable and reliable electricity supply.
- Storage addresses the fundamental problem of intermittency, where renewable generation and electricity demand do not coincide in time.
Why Storage Matters ?
- Solar generation falls to zero after sunset, while wind output fluctuates with weather conditions. However, electricity demand often peaks during evening hours, creating a significant mismatch between supply and demand.
Major Types of Energy Storage
Pumped Hydro Storage (PHS)
- PHS uses excess electricity to pump water from a lower reservoir to an upper reservoir. During peak demand, water is released downhill through turbines to generate electricity.
- It is a mature, long-duration technology with relatively low operating costs and large-scale storage capability.
Battery Energy Storage Systems (BESS)
- BESS stores electricity electrochemically, most commonly using Lithium Iron Phosphate (LFP) batteries, known for high efficiency, declining costs, and improved safety.
- Battery systems respond rapidly and are ideal for grid balancing and short- to medium-duration storage.
Other Emerging Technologies
- Additional technologies include compressed-air storage, thermal storage using molten salts, flywheels, and gravity-based systems, though these remain less widely deployed.
India’s Current Storage Capacity
- India currently has only about 7.2 GW of Pumped Hydro Storage and approximately 0.27 GW of Battery Storage, which is far below projected requirements.
- This gap highlights that storage deployment has not kept pace with the rapid expansion of renewable energy generation.
Future Storage Requirement
- According to the Central Electricity Authority, India’s total non-fossil fuel capacity is expected to increase from 283 GW to 786 GW by 2035–36.
- To support this scale, the country will need 174 GW / 888 GWh of storage, with systems capable of providing 4–6 hours of discharge duration.
Project Pipeline in India
Pumped Hydro Projects
- Around 13.1 GW of PHS capacity is currently under construction, while an additional 9.6 GW has received approval and nearly 75 GW is under survey and investigation.
Battery Storage Projects
- Approximately 10.66 GW / 28.7 GWh of BESS is under construction, and over 22.3 GW / 69.8 GWh is in the tendering stage.
Economic and Strategic Significance
Grid Stability
- Storage smooths supply fluctuations, reduces curtailment of renewable power, and ensures continuous electricity availability during peak demand periods.
Energy Security
- Domestic storage capacity reduces dependence on imported fossil fuels and enhances resilience against global energy disruptions.
Economic Efficiency
- By shifting low-cost renewable electricity to peak hours, storage lowers system costs and reduces reliance on expensive peaking power plants.
Link with India’s Climate Goals
- India has committed to achieving 500 GW of non-fossil fuel capacity by 2030 and net-zero emissions by 2070.
- Large-scale energy storage is essential to integrate renewable power and meet these long-term decarbonization targets.
Challenges
Import Dependence
- India imports nearly 75–80% of lithium-ion cells, which account for about 80% of total battery system costs, creating strategic vulnerability.
Critical Minerals Constraint
- Lithium, cobalt, nickel, and graphite are geographically concentrated, exposing India to supply-chain risks and price volatility.
High Capital Costs
- Upfront costs for battery and pumped storage projects remain substantial, increasing financing requirements.
Environmental and Social Concerns
- Pumped hydro projects may involve land acquisition, forest diversion, and ecological impacts in sensitive areas.
Regulatory Uncertainty
- Evolving market rules for storage remuneration and ancillary services can delay investment decisions.
Global Perspective
Pumped Hydro
- Global installed pumped hydro capacity is approximately 160 GW, with China leading at around 66 GW.
Battery Storage
- Global battery storage capacity is estimated at roughly 270 GW, with 108 GW added in 2025 alone, reflecting rapid worldwide deployment.
Implications for India
Manufacturing Opportunity
- Storage expansion can stimulate domestic industries in batteries, electronics, inverters, and power systems.
Strategic Autonomy
- Building indigenous capability in cells and critical minerals processing will reduce dependence on concentrated global suppliers.
Employment Generation
- Large-scale deployment can create jobs across manufacturing, engineering, mining, and grid infrastructure.
Prelims Pointers
- Pumped Hydro Storage uses gravitational potential energy of water.
- Lithium Iron Phosphate (LFP) is a widely used battery chemistry for stationary storage.
- India’s current BESS capacity is approximately 0.27 GW.
- Central Electricity Authority projects 174 GW / 888 GWh of storage by 2035–36.
- Storage systems are crucial for integrating intermittent renewable energy.
