Solar and wind are cheap, but they are also weather-dependent: solar stops at sunset, wind rises and falls with the breeze. A DISCOM (distribution company) cannot run a grid on power that arrives only when the sun is out. FDRE (Firm and Dispatchable Renewable Energy) tenders were created to fix exactly this problem. Instead of buying “whatever the plant generates,” the buyer specifies when it wants power and how much, and the developer has to deliver against that schedule.
The trick that makes it possible is storage. By pairing solar and wind with a BESS (battery energy storage system), a developer can soak up midday solar, hold it, and release it during the evening peak — turning a variable resource into a firm, plannable one.
What “firm and dispatchable” actually means
Two words carry the whole idea:
- Firm — the supply is reliable and guaranteed to be there, not “if the wind blows.”
- Dispatchable — the buyer can call on it at chosen hours, the way you can dispatch a thermal plant.
In a plain solar tender you buy energy as it comes. In an FDRE tender the relationship flips: the buyer sets a demand schedule in advance and the developer must schedule power to match it. It is a demand-following contract, sometimes described as the buyer getting “what they want” rather than “what is offered.” FDRE typically comes in two flavours — round-the-clock supply across all 24 hours, or peak-hour supply that guarantees a fixed block (commonly four hours) during the evening demand spike.
To hit that schedule, developers over-build the renewable capacity and add a BESS. The same logic underpins our renewable firming and solar-plus-wind-plus-battery solutions: variable generation goes in, firm output comes out.
How the tender is structured
Most FDRE tenders share a common shape, set by the MNRE (Ministry of New and Renewable Energy) bidding guidelines:
- Build-Own-Operate model. The developer finds land, secures grid connectivity and statutory approvals, and builds solar and/or wind co-located with storage.
- Long PPAs. Power purchase agreements typically run 25 years. SECI’s recent FDRE-IX tender, for example, seeks 1,200 MW of contracted capacity delivering 4,800 MWh across a four-hour peak window, on 25-year PPAs, per Energy-Storage.News reporting.
- Minimum bid sizes. Bids commonly start at 50 MW, with per-developer caps set tender by tender.
- Extra revenue allowed. Outside the contracted peak hours, developers can trade surplus energy on power exchanges or sell to third parties — an important part of project economics.
The agencies running these auctions are the familiar central intermediaries: SECI (Solar Energy Corporation of India) is the most active, alongside NTPC and its trading arm NVVN (NTPC Vidyut Vyapar Nigam), NHPC and SJVN. Several states also procure firm RE directly for their own DISCOMs. SECI aggregates the power and on-sells it to state distribution companies.
Availability, CUF and the penalty that keeps it honest
An FDRE contract is only meaningful if under-delivery has consequences. Two performance levers do the work:
- CUF (capacity utilisation factor). Tenders set a minimum annual CUF for the renewable plant — for instance, ACME Solar’s NHPC-linked FDRE project carries a 40 percent minimum annual CUF plus a four-hour daily peak obligation, per Energy-Storage.News.
- DFR (demand fulfilment ratio). The developer must meet a minimum monthly DFR, commonly 90 percent, calculated as the power actually scheduled divided by the demand the buyer specified.
If the developer falls short, the penalty bites. Across FDRE tenders the standard penalty is 1.5 times the PPA tariff applied to the shortfall energy in the relevant time block, per the FSR Global explainer. Some designs allow a limited annual relaxation on strict hourly matching, but the direction is clear: oversize the plant and size the battery correctly, or pay a premium on every missed unit.
On price, firming does add cost over plain solar, yet FDRE tariffs have stayed competitive. Construction World reported one SECI FDRE auction discovering a tariff of around Rs 4.98 per unit — remarkable for around-the-clock or guaranteed peak renewable power.
How this compares to plain RE and standalone storage
| Feature | Plain solar / wind | Standalone BESS tender | FDRE tender |
|---|---|---|---|
| What is sold | Energy as generated | Storage capacity / service | Firm, scheduled power |
| Storage required | No | Yes (only storage) | Yes (RE + storage bundled) |
| Buyer control of timing | Low | Indirect | High (demand schedule) |
| Penalty for shortfall | Limited | Availability-based | 1.5x tariff on shortfall |
If you want the storage-only side of the picture, see SECI standalone storage tenders; for the deep dive on the central agencies driving FDRE, see NTPC and NVVN FDRE tenders explained. Live FDRE and BESS auctions are collected in our tender tracker.
What this means for you
For developers and EPC bidders: the winning FDRE bid is an engineering problem before it is a pricing problem. Getting the battery-to-RE ratio right — enough BESS to firm the profile without over-spending — is what protects your margin against that 1.5x penalty. A solar-wind-plus-BESS architecture with correctly sized packs is the core of a bankable bid.
For DISCOMs and large buyers: FDRE lets you replace peaking gas or expensive market buys with contracted, schedulable clean power at a fixed long-term tariff — planning certainty you cannot get from vanilla solar.
For C&I buyers watching the trend: the same firming logic scales down to a factory or campus, pairing on-site RE with a standalone BESS to flatten your own load.
Alpha Devraj ESS supplies the LFP battery systems that make firm, dispatchable delivery possible. If you are shaping an FDRE bid or a firming project and want help sizing the storage, talk to our team.
This is a policy area that moves quickly. Tender terms — CUF, DFR thresholds, peak-hour definitions and penalty multipliers — vary between tranches and change by notification, so confirm the exact provisions in the live RfS before committing.
Policy snapshot as of July 2026. Terms change by notification; verify current provisions before financial decisions.