Viability Gap Funding, or VGF, is the single biggest reason standalone battery prices in Indian tenders have fallen so fast. But “40% subsidy” is a headline, not an explanation. The interesting part is how the money is structured — because that structure is what actually pushes the tariffs your DISCOM (distribution company) pays down to the numbers you now see in the news. This is the deep-dive companion to our broader guide to BESS subsidies in India.
What “viability gap” actually means
A battery project earns money — from capacity payments, arbitrage and grid services — but for years those earnings did not quite cover the cost of building it. The difference between “what it costs” and “what the market will pay” is the viability gap. VGF is a one-time government grant that fills that gap, so a project that would otherwise be uneconomic clears at a price a DISCOM can afford.
Crucially, VGF is a capital grant, not a per-unit subsidy. The government does not pay you for every unit of electricity stored. It writes down your upfront cost once, and then the project stands on its own. That is why it works best for a standalone BESS — a battery with no co-located generation, sold to the grid as a pure storage service.
How the money is paid — milestone by milestone
The grant is not handed over on day one. Under the expanded 2025 scheme, VGF is released in three milestone-linked tranches, tied to real progress on the ground rather than promises:
That back-loading is deliberate. By holding 30% of the grant until the battery has run for a year, the scheme rewards systems that are actually built well and dispatched reliably — not just installed and forgotten. For a buyer, it is a quiet quality signal: a VGF-backed project has a government incentive to keep performing.
How you win it: a reverse auction on the subsidy itself
Here is the part most summaries skip. The “up to 40%” is a ceiling, not an entitlement. Nobody is simply handed 40% of their capex. Instead, developers compete in a tender, and the thing they bid down is the VGF they need.
The agency running the tender — the Solar Energy Corporation of India (SECI), NTPC, or a state utility — sets a maximum VGF per unit of capacity. Developers then quote the lowest grant they can accept while still meeting the required tariff. The lowest VGF askers win. In the 2025 scheme, the maximum was set at ₹18 lakh per MWh of capacity, and competitive bidding routinely settles below that. You can watch this play out in near-real-time on our tender tracker.
This auction design is why discovered storage tariffs have collapsed — falling cell prices and hungry bidding on the subsidy pull in the same direction. The knock-on effect on system pricing is covered in our BESS price guide.
The two rounds so far: 2023 and 2025
The scheme has been notified in two major waves, each larger than the last:
| Feature | Original scheme (Sept 2023) | Expanded scheme (June 2025) |
|---|---|---|
| Capacity supported | 4,000 MWh (later raised to 13.2 GWh) | 30 GWh (additional) |
| Government outlay | ₹9,400 cr outlay; ₹3,760 cr budgetary support | ₹5,400 cr |
| Max VGF | Up to 40% of capital cost | Up to 40%, capped at ₹18 lakh/MWh |
| Disbursement | Milestone-linked tranches | 20% / 50% / 30% (3 tranches) |
| Who gets the capacity | Min 85% offered to DISCOMs | 25 GWh to 15 states, 5 GWh to NTPC |
The 2025 round spread capacity across fifteen states, with Rajasthan, Gujarat and Maharashtra each allocated 4,000 MWh — the largest shares — and states like Karnataka and Andhra Pradesh at 1,500 MWh each. The original 2023 scheme also set a public benchmark: a target Levelized Cost of Storage (the all-in cost per unit delivered) of roughly ₹5.50–6.60 per kWh. For how this central money layers on top of state-level support, see our India BESS policy overview.
The strings attached
VGF is generous, but it is conditional. Three obligations matter most:
- DISCOM offtake. The original scheme required a minimum of 85% of a project’s capacity to be made available to distribution companies — the whole point is cheaper peak power for the grid, not merchant trading.
- A hard commissioning deadline. Projects must be commissioned within 18 months of signing the storage purchase agreement. Miss it and the grant is at risk.
- Domestic content. From an August 2025 amendment to the VGF guidelines, VGF-backed projects must meet a minimum 20% local content as a share of project cost, and use indigenously developed energy-management software. This pushes demand toward Indian-made systems.
Separately — though not part of VGF itself — storage co-located with solar and pumped-hydro projects that sign construction contracts on or before 30 June 2028 continues to enjoy a 100% waiver on inter-state transmission (ISTS) charges for power consumed outside its home state, a further boost to project economics.
What this means for you
- If you are a developer or IPP: VGF eligibility, and how tightly you bid it, decides whether you win. Budget for the milestone cashflow — you fund most of the build before the 50% commissioning tranche arrives — and design your supply chain for the 20% local-content rule from day one, not as an afterthought.
- If you are a DISCOM or large buyer: VGF-backed capacity is the cheapest firm peak power on offer right now, and the one-year-hold tranche gives you a built-in performance guarantee. The 85% offtake rule exists precisely so you can access it.
- If you are a C&I (commercial and industrial) buyer behind the meter: central VGF largely does not reach you — your economics rest on tariff arbitrage and demand-charge savings instead. Many such projects now pay back without any subsidy at all.
Policies and tenders here change by notification, and grant caps, deadlines and content rules have already moved twice — treat this as a July 2026 snapshot and confirm the current notification before you commit. To see roughly what storage could save on your own site, or to talk through whether a VGF-linked project fits your plans, try our BESS savings calculator.
Policy snapshot as of July 2026. VGF scheme terms, caps and deadlines change by government notification; verify current provisions with the Ministry of Power / SECI tender documents before financial decisions.