India’s Battery Energy Storage Systems Boom, and What Policy Must Get Right Next
Executive Summary
India’s Battery Energy Storage System (BESS) market is moving from pilots to core grid infrastructure. The growth story is not only about falling battery costs, it is about policy certainty. In the last few years, the Government of India has put in place a coherent policy stack that creates demand, clarifies procurement, reduces early stage viability gaps, and starts opening market based revenue streams for storage. Key pillars include the Ministry of Power’s National Framework for Promoting Energy Storage Systems, procurement and utilization guidelines for BESS, a notified Energy Storage Obligation (ESO) trajectory through FY 2029 to 30, and dedicated Viability Gap Funding (VGF) support.
The policy implication is clear: India is no longer asking whether storage will be needed, it is designing how storage will be bought, paid for, dispatched, and integrated into grid planning. The next phase must focus on execution quality, including bankable contracting, performance measurement, safety standards, and credible ESO enforcement.
Background and Context
Solar and wind have reached a scale where variability is a system wide issue. Grid operators need firm, fast response flexibility to manage ramping, reduce thermal cycling, and maintain reliability during evening peaks and low renewable periods. Storage is uniquely suited because it can respond in milliseconds, shift energy across hours, and deliver multiple grid services.
India’s planning ecosystem already reflects this shift. The Central Electricity Authority’s report on the optimal generation capacity mix for 2029 to 30 explicitly models battery energy storage at meaningful scale, indicating storage is becoming embedded in national level least cost planning, not treated as an optional add on.
Policy and Regulatory Framework
The Ministry of Power’s National Framework for Promoting Energy Storage Systems, is the policy umbrella that positions storage as a technology agnostic system resource across generation, transmission, distribution, and markets. It consolidates the government’s approach, including how storage should be planned, procured, and enabled through regulatory and financial mechanisms.
This matters because financing does not scale on ambition alone. It scales when rules are clear on what storage is allowed to do, who can buy it, how it can be dispatched, and which revenue streams are legitimate.
Procurement Guidelines and Contracting Architecture
A major bankability milestone is the Ministry of Power’s “Guidelines for Procurement and Utilization of Battery Energy Storage Systems as part of Generation, Transmission and Distribution assets, along with Ancillary Services”.
These guidelines reduce ambiguity by explicitly allowing BESS to be procured as part of the power system asset base and used for defined applications. In practice, that enables multiple procurement models, including storage procured by a distribution licensee for peak management, by a generator for renewable firming, or by a grid utility for system support, subject to contracting structures. The guidelines also recognize that storage is not only “energy shifting”, it can support ancillary services, which is critical for revenue stacking over time.
Policy implication:
India should now standardize tender templates and performance definitions so that each new tender does not reinvent risk allocation. The more uniform the contracting approach becomes, the faster lenders can price risk, and the faster capacity can scale.
Energy Storage Obligation (ESO) Trajectory and Demand Creation
If procurement guidelines define “how to buy”, ESO defines “why you must buy”. The Ministry of Power notified a combined Renewable Purchase Obligation (RPO) and Energy Storage Obligation (ESO) trajectory through 2029 to 30.
The official trajectory sets ESO rising from 1 percent in FY 2023 to 24 to 4 percent by FY 2029 to 30. This creates structural demand for storage-linked renewable consumption. It also signals to developers that storage will not remain a niche tender market.
Policy implication:
ESO will only translate into real demand if compliance is measurable and enforceable. That means clear accounting rules for what qualifies as “renewable energy through ESS”, robust metering and verification, and transparent reporting by obligated entities. The trajectory is a strong start, but enforcement design will decide whether ESO becomes a reliable pipeline or an on paper requirement.
Financial Support Mechanisms and Viability Gap Funding
Even with good rules, early deployments often face a viability gap because the system value of flexibility is not fully monetized yet. To accelerate adoption, the Government has issued operational guidelines for a VGF scheme for development of BESS, published on MNRE’s site as an official document issued by the Ministry of Power.
In June 2025, the Ministry of Power approved a VGF scheme for development of 30 GWh of BESS supported through the Power System Development Fund (PSDF), providing a major scale signal and lowering early cost barriers for states and implementing agencies.
Policy implication:
VGF should reward outcomes, not just installations. As India scales, funding design should increasingly be linked to verified availability during peak windows, validated response times, and declared degradation performance. That approach protects public money, improves fleet reliability, and builds investor confidence that early projects will perform as contracted.
Transmission and Grid Connectivity Incentives
Delivered cost is not only about batteries, it is also about network charges. The Ministry of Power issued an order on Waiver of Inter State Transmission System (ISTS) charges for Energy Storage Systems in June 2025.
By reducing ISTS charges for eligible storage projects under specified conditions and timelines, the waiver improves project economics and can influence siting decisions. It also helps distribution companies and other offtakers procure flexibility at lower all in costs, which can speed up adoption at scale.
Policy implication:
Transmission waivers can be powerful, but they also need clarity and stability. Frequent changes increase uncertainty and can delay investment. The June 2025 order is helpful precisely because it provides an official basis and time bound eligibility that market participants can plan around.
Market Design, Ancillary Services, and Dispatch Integration
Long term scale requires more than one revenue stream. Storage becomes more financeable when it can stack revenues across energy shifting, capacity like services, and balancing. On the regulatory side, the Central Electricity Regulatory Commission’s “Ancillary Services Regulations, 2022” explicitly apply to entities having energy storage resources, which helps formalize storage as a provider of grid balancing services at the regional level. (CERC)
Policy implication:
India is laying the groundwork for storage to earn market based revenues, but the transition must be operational, not just legal. Dispatch protocols, scheduling frameworks, and settlement systems must adapt so that storage can participate predictably and be paid for performance. Without that, storage remains overly dependent on long term tenders, limiting innovation in business models.
Implementation Risks and What Policy Must Get Right
- Bankable performance definitions
BESS is a performance asset. Poorly defined availability, response, and degradation terms can cause disputes and underperformance. Standardizing technical specifications and warranty requirements within tender documents will reduce transaction cost and avoid lowest price traps.
- Safety, recycling, and lifecycle governance
Scale brings safety and end of life considerations to the center. Procurement and regulatory frameworks must align with strong safety standards and enforceable end of life responsibility.
- ESO credibility through measurement
If ESO compliance is weak, developers will treat it as a soft signal. If compliance is credible, it becomes a demand floor. That requires transparent monitoring and clear definitions tied to the notified trajectory.
- Grid integration as “flexibility capacity”
Planning already includes storage at scale, but operations must also evolve. Storage should be treated as a flexibility resource with defined peak contribution and reliability value, not only as installed MW and MWh. CEA planning documents offer the basis for this shift.
From Policy to Performance, Making Storage Deliver at Scale
India’s BESS market is poised for sharp growth because the government has built a practical policy stack: a national framework that mainstreams storage, procurement guidelines that reduce contracting ambiguity, an ESO trajectory that creates long term demand, VGF schemes that close early viability gaps, and ISTS waivers that improve delivered economics.
The next phase is not about announcing more intent. It is about execution: standardized performance based procurement, enforceable compliance and measurement, and market rules that pay storage for the grid value it delivers. Done right, storage becomes the enabling infrastructure that turns renewable energy from “available when the sun shines” into “reliable when the country needs it most.”