Pumped Storage Hydropower Driving India's Clean Energy Shift

India is rapidly expanding its renewable energy capacity to build a cleaner, resilient, and reliable power grid. Solar and wind power lead this nationwide transition. However, variable weather conditions cause fluctuations in renewable generation. India requires large-scale energy storage systems to store excess electricity and discharge power during peak demand.

Pumped Storage Hydropower (PSH) functions as a massive, natural water battery. The system uses electricity to pump water to an elevated upper reservoir, storing energy as gravitational potential energy. During peak power demand, the system releases water through hydroelectric turbines to generate clean electricity instantly.

This technology helps integrate solar and wind energy, stabilizes grid frequency, and supports India's target of achieving 500 GW of non-fossil fuel-based electricity capacity by 2030.

India’s Urgent Requirement for Long-Duration Energy Storage

India continues to strengthen its clean energy infrastructure. By July 2026, the country crossed 300 GW of installed non-fossil fuel generation capacity. During the 2025–26 financial year, India added 55.29 GW of non-fossil power capacity.

Solar panels produce power during daylight hours, while wind turbines depend on weather patterns. Conversely, national power consumption spikes during evening hours when solar generation drops to zero. Energy storage balances this supply-demand mismatch.

According to projections by the Central Electricity Authority (CEA), India will require 73.93 GW of total energy storage capacity by 2031–32. This mandate includes 26.69 GW from Pumped Storage Projects (PSPs) and 47.24 GW from Battery Energy Storage Systems (BESS).

Technical Classification of Pumped Storage Projects

India categorizes Pumped Storage Projects into three distinct technical configurations based on their connection to natural river systems:

1. On-Stream Pumped Storage: Both upper and lower reservoirs reside on a perennial river, stream, or natural watercourse.
2. Off-Stream Open-Loop Pumped Storage: One reservoir sits on a perennial river or stream, while the second reservoir exists away from natural watercourses.
3. Off-Stream Closed-Loop Pumped Storage: Neither reservoir connects to a perennial natural river or stream. Both reservoirs operate inland, significantly reducing ecological impacts on aquatic ecosystems.

PSH vs. Battery Storage: Key Technical Differences

Battery Energy Storage Systems (BESS) and Pumped Storage Projects (PSPs) fulfill distinct, complementary roles across the national power grid:

National Capacity Breakdown and Regional Potential

India is expanding its pumped storage assets through active construction and an extensive project development pipeline.

As of August 2026, India maintains 7.43 GW of operational PSP capacity across 10 large projects. Another 15.87 GW across 11 projects is currently under active construction. The CEA has concurred with or appraised an additional 8 projects totaling 10.40 GW.

Comprehensive national surveys identify 320 potential PSP sites across India with a combined capacity of 345.38 GW (62 on-stream projects offering 56.67 GW and 258 off-stream projects providing 288.71 GW).

Geographical Distribution of Identified Potential:

• Western Region (129.72 GW): Leads the country, with Maharashtra holding 67.36 GW and Gujarat offering 33.36 GW.
• Southern Region (97.76 GW): Driven by high-altitude terrains in Andhra Pradesh, Telangana, and Tamil Nadu.
• Eastern Region (53.41 GW): Anchored by Odisha with 41.53 GW.
• Northern Region (50.32 GW): Supported by Himalayan river systems and valleys.
• North Eastern Region (14.18 GW): Offers unexplored off-stream storage corridors.

Long-Term Capacity Expansion Roadmap Through 2036

The Central Electricity Authority mapped a long-term expansion plan through 2035–36. The framework targets commissioning 100.81 GW of new PSP capacity, raising India's cumulative operational capacity to 105.56 GW.

Project commissioning will accelerate rapidly after 2028, adding 13.50 GW in 2029–30 and 21.19 GW in 2030–31.

Global Standings: India Ranks Fourth Worldwide

Pumped Storage Hydropower represents over 90% of global grid-scale energy storage capacity.

According to data from the International Renewable Energy Agency (IRENA), global installed pumped hydro capacity reached 159.8 GW at the end of 2025.

India ranks fourth globally, increasing its operational capacity to 7.43 GW by July 2026.

Key Government Initiatives and Policy Push

The Government of India has introduced several key policy measures to accelerate PSP execution:

1. PSH Guidelines (April 2023): Promotes off-stream projects and streamlines land allotment.
2. Infrastructure Financial Support: Provides central funding for access roads, bridges, ropeways, and transmission lines.
3. Transmission Charge Waiver: Grants a 100% Inter-State Transmission System (ISTS) charge waiver for 25 years to PSPs awarded before June 30, 2028.
4. Streamlined CEA Approvals: Reduced Detailed Project Report (DPR) concurrence timelines from 90 days to 50 days.
5. DPR Portal Launch: Deployed the digital Jal Vidyut DPR portal for real-time survey monitoring.
6. Revised CapEx Rules (August 2025): Raised the capital expenditure threshold requiring CEA concurrence to ₹3,000 crore. Off-stream closed-loop PSPs no longer require CEA concurrence based on CapEx limits.

Comprehensive Summary: India's PSH Framework