From 98 MWh to 8.2 GWh: What India's Storage Tenders Say About DISCOM Readiness

India's battery storage market has moved from announcements to procurement volume. Mercom India Research reports that the country added 8.2 GWh of battery energy storage capacity in the first half of 2026, nearly 84 times the 98.4 MWh installed in the same period a year earlier. The tender pipeline of September and October 2026 shows who is buying, in what formats, and where the open questions for distribution utilities sit.

The volume jump and the base effect

The 8.2 GWh figure is striking mainly because the comparison base was tiny. A year earlier, 98.4 MWh was a pilot-scale number. The more useful reading is that storage has become a routine line in public-sector procurement rather than a demonstration. The same Mercom wrap-up lists a 125 MW/500 MWh standalone system at Kajra in Lakhisarai district, Bihar, which BSPGCL tendered on a Build-Own-Operate-Transfer basis with tariff-based competitive bidding and land provided by the state generator, with bids due on 23 September 2026. It also lists an NTPC expression of interest for a pilot sodium-ion system at its thermal projects or office buildings, due 15 October 2026.

A growth rate off a small base says little about operating performance. Installed megawatt-hours do not show how often systems cycle, whether they are dispatched against evening peaks, or whether they earn their tariff. Those answers will come only from operating data over the next several quarters.

Four procurement models in recent months

The tenders published since July do not follow one template, which is itself informative.

Owner-operator EPC. Coal India floated an EPC tender for 80 MW/320 MWh of battery storage at four locations in Odisha, including comprehensive operation and maintenance for 15 years, with bids due on 9 October 2026. The buyer owns the asset and contracts the long-term upkeep, which places performance risk on the O&M contractor.

Turnkey transmission-side supply. POWERGRID's tender for a 250 MW/1,000 MWh system classified as Category-B (4-hour BESS) was run under a Long Term Agreement, as complete design, supply, erection, testing and commissioning on a turnkey basis. According to SolarQuarter, the stated aims are grid stability, peak management and storing surplus renewable generation. The tender carried nil tender fee and nil earnest money deposit, with a performance bank guarantee required of successful bidders. Bids closed on 17 August 2026.

Storage as a service. SECI's SECI-ESS-IV tender, published on 1 October 2026, selects developers to supply energy from standalone battery systems for "on-demand" use, with a bid deadline of 30 October 2026. The reporting does not give the capacity or contract terms, so the commercial structure remains to be read from the tender documents.

Distribution-utility capacity contracts. The Andhra Pradesh Central Power Distribution Corporation (APCPDCL) invited bids to procure four-hour storage capacity from fully commissioned battery systems for two years, with a bid deadline of 14 October 2026. This is the model closest to a DISCOM's daily needs: buying a usable capacity block without carrying construction risk, for a term short enough to revisit as technology and prices move.

Why four-hour duration keeps appearing

Both the POWERGRID Category-B classification and the APCPDCL procurement specify four hours of storage. For a distribution utility, duration is a proxy for the problem being solved: shifting solar-hour surplus into the evening demand window rather than providing seconds-scale frequency response. A four-hour block maps directly onto that shape. Contracts written around this duration therefore tie the value of storage to the quality of the utility's own forecasting, scheduling and time-of-day tariff design.

What it means for utilities

For DISCOMs, the practical lesson is that the asset is the easy part. A short-term capacity contract such as the Andhra Pradesh procurement only creates value if the utility can dispatch the battery against a known peak, meter the energy that goes in and comes out, and account for losses in the round trip.

Three operational prerequisites follow:

• Dispatch intelligence. Charging and discharging schedules need feeder- or substation-level load forecasts, otherwise a four-hour battery may discharge at the wrong time.
• Metering and settlement. Storage capacity contracts require interval data to verify availability and delivered energy, which depends on the same smart metering and data layers that DISCOMs are still completing.
• Contract design. Owner-operator, turnkey and capacity-lease models allocate risk differently. Performance guarantees, O&M terms and tenor decide who pays when a system underdelivers.

The sodium-ion expression of interest from NTPC is a reminder that chemistry choices are still open. Utilities that lock in long contracts on a single technology assumption carry that risk.

What to watch

• The outcome of SECI-ESS-IV after the 30 October 2026 deadline, including capacity and any discovered tariff.
• Award prices and bidders for the Coal India, POWERGRID and APCPDCL tenders, once published.
• Whether Mercom's next quarterly data shows installed storage actually being commissioned at the pace the tender flow implies.
• Evidence of operating performance, such as cycling and availability, from the first large systems.

Key takeaways

• India added 8.2 GWh of battery storage in 1H 2026, nearly 84 times the 98.4 MWh of a year earlier, though from a very small base.
• Recent tenders span EPC with 15-year O&M, turnkey supply, on-demand storage as a service and short-term capacity procurement by a DISCOM.
• Four-hour duration is the recurring specification, matching the evening peak that solar-heavy systems create.
• The value of storage depends on dispatch, metering and forecasting capability, not on the asset alone.
• Operating data, not installed capacity, will decide which procurement models hold up.

Sources

• Daily News Wrap-Up: India Adds 8.2 GWh Battery Storage in 1H 2026 (Mercom India)
• SECI Floats Tender for Standalone Battery Storage Projects Across India (Mercom India)
• Andhra Pradesh Invites Bids for Battery Energy Storage Procurement (Mercom India)
• Coal India Tenders 80 MW/320 MWh Battery Storage Projects in Odisha (Mercom India)
• POWERGRID Invites Bids for 250 MW/1000 MWh Battery Energy Storage System Across India (SolarQuarter)