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

India's installed solar capacity crossed 150 GW as of March 2026, making it the third-largest solar power producer globally, after China and the United State...

What Happened

India's installed solar capacity crossed 150 GW as of March 2026, making it the third-largest solar power producer globally, after China and the United States.
Non-fossil fuel sources now constitute over 50% of India's total installed power capacity (484.82 GW), yet contribute only about 26–29% of actual electricity generation — reflecting a widening capacity–reliability gap driven by solar intermittency.
A recent editorial assessment highlighted that the country's policy approach must shift from a generation-centric model to a storage-centric one: integrating Battery Energy Storage Systems (BESS) is now central to making solar power dispatchable and grid-stable.
India's first solar-plus-6-hour BESS auction (early 2026) discovered a tariff of ₹3.12 per kWh — a landmark in demonstrating the economic viability of storage-backed renewable energy.
Between 2022 and mid-2025, approximately 12.8 GWh of BESS capacity was auctioned; however, only about 219 MWh is operational, indicating a large execution gap between awarded projects and on-ground deployment.

Static Topic Bridges

Battery Energy Storage Systems (BESS) — Technology and Grid Role

A Battery Energy Storage System (BESS) stores electrical energy using electrochemical cells (most commonly lithium-ion) and discharges it on demand. In the context of renewable energy integration, BESS solves the intermittency problem: solar panels generate power only during daylight hours, creating a supply gap during evening peak demand — the so-called "duck curve" phenomenon (named after the shape of the net load curve in grids with high solar penetration).

BESS can serve multiple grid functions simultaneously: energy time-shifting (storing midday solar for evening use), frequency regulation, voltage support, and backup against grid failures. Unlike pumped storage hydro (the other major grid-scale storage technology), BESS can be deployed at any location, requires no water body, and responds to grid signals within milliseconds.

India's National Electricity Plan (NEP) 2023 projects a requirement of 411.4 GWh of energy storage by 2031–32: 236.22 GWh from BESS and 175.18 GWh from pumped storage projects.
Capital costs in India remain above ₹2.5 crore per MWh, driven by dependence on imported lithium, cobalt, and nickel — chiefly from China and the Democratic Republic of Congo.
The NEP 2023 also projects 61 GW/218 GWh of cost-effective energy storage needed by 2030 to support the 500 GW clean power target.
Pumped Hydro Storage (PHS) is the most mature large-scale storage technology globally and in India; the CEA identifies a potential of over 96 GW of PHS in India.

Connection to this news: India has accumulated solar capacity rapidly but without proportional storage deployment, the surplus daytime generation is curtailed and evening demand continues to be met by thermal plants. Scaling BESS is the key bottleneck now.

Viability Gap Funding (VGF) Scheme for BESS

The Union Cabinet approved the VGF Scheme for Battery Energy Storage Systems on 6 September 2023 (nodal ministry: Ministry of Power). VGF is a form of capital subsidy provided by the government to bridge the gap between the cost of supply and the revenue a project can generate at commercially viable tariffs — a standard instrument used across infrastructure sectors.

Under the BESS-VGF scheme, the government provides financial support covering up to 30% of capital cost (or ₹46 lakh per MWh, whichever is lower) for storage projects. Projects must allocate a minimum of 85% of capacity to electricity distribution companies (DISCOMs). The scheme targets 4 GWh of BESS, later scaled to 13.5 GWh as battery costs fell.

Scheme approved: September 2023; support covers BESS projects approved during 2023–26.
Total budgetary outlay: revised to ₹3,760 crore for the initial tranche.
By April 2025, 12.1 GWh of capacity had been issued under the scheme.
Implementation challenge: As of 2024–25, no expenditure was incurred as none of the awarded projects achieved financial closure — underscoring the risk of paper capacity vs actual deployment.
Solar Energy Corporation of India (SECI) is the primary implementing agency for BESS tenders under VGF.

Connection to this news: The VGF scheme is the primary government lever for accelerating BESS deployment, but execution gaps — financial closure delays, supply chain risks, import dependency — are the exact challenges the editorial analysis flags.

India's 500 GW Non-Fossil Fuel Target and NDC Commitments

India committed in its updated Nationally Determined Contribution (NDC, submitted August 2022) to: (a) achieve 50% cumulative electric power installed capacity from non-fossil based energy resources by 2030, and (b) reduce the emissions intensity of GDP by 45% from 2005 levels by 2030.

The 500 GW non-fossil capacity target by 2030 is the domestic translation of this NDC goal. The National Electricity Plan (NEP) 2023, prepared by the Central Electricity Authority (CEA), provides the detailed roadmap: solar energy is projected to grow from 150 GW (2026) to about 292 GW by 2031–32.

India's total installed power capacity: 484.82 GW as of March 2026; non-fossil share: 283.46 GW (50.07%).
Solar: 150.26 GW; Wind: 56.09 GW; Large Hydro: 51.41 GW; Nuclear: 8.78 GW (as of March 2026).
India is currently the third-largest renewable energy capacity holder globally.
The 500 GW target is anchored in the Paris Agreement (COP21, 2015); India ratified the Paris Agreement in October 2016.
The gap between installed capacity (50%) and generation share (26–29%) represents the "capacity factor" problem — solar plants operate at 18–22% capacity factor vs 70–85% for thermal plants.

Connection to this news: Meeting the 500 GW target is insufficient if intermittent generation cannot be reliably dispatched. Achieving both the capacity and the usable output goals requires BESS at the scale envisioned in NEP 2023.

Pumped Storage Hydro (PSH) — India's Complementary Storage Option

Pumped Storage Hydro works by using surplus electricity (typically off-peak or daytime solar) to pump water from a lower reservoir to an upper reservoir; the stored potential energy is then released through turbines during peak demand. PSH is the oldest and most deployed large-scale electricity storage technology globally, accounting for over 90% of global grid-scale storage capacity.

India's assessed PSH potential: approximately 96.52 GW across 63 identified sites (CEA assessment).
Existing PSH capacity in India: approximately 4.7 GW operational.
PSH advantages: long life (50+ years), large capacity, no battery degradation, uses proven technology.
PSH disadvantages: geography-dependent, long gestation periods (8–10 years), high capital cost, environmental concerns related to reservoir construction.
NEP 2023 target: 175.18 GWh from PSH by 2031–32.

Connection to this news: The editorial implicitly underscores the need to develop both BESS and PSH in parallel — BESS for short-duration, modular, location-flexible storage; PSH for long-duration, large-scale storage at strategic grid nodes.

Key Facts & Data

India's solar installed capacity (March 2026): 150.26 GW (utility: 110.43 GW; rooftop: 25.73 GW; off-grid/PM-KUSUM: 14.10 GW)
India's total installed power capacity (March 2026): 484.82 GW; non-fossil share: 50.07%
Renewable energy (incl. large hydro) share of electricity generation: 26.2% in FY 2025–26
BESS auctioned (2022–mid-2025): ~12.8 GWh; BESS operational: ~219 MWh
India's first solar + 6-hour BESS auction tariff: ₹3.12/kWh (early 2026)
NEP 2023 BESS requirement by 2031–32: 236.22 GWh
NEP 2023 total storage requirement by 2031–32: 411.4 GWh
VGF scheme approved: September 6, 2023; target: 13.5 GWh of BESS
VGF support ceiling: 30% of capital cost or ₹46 lakh/MWh (whichever is lower)
India's NDC target: 50% non-fossil installed capacity by 2030; 45% emissions intensity reduction from 2005 levels by 2030
India's solar capacity addition in FY 2025–26: 44.61 GW (highest ever in a single financial year)