Two useful things happened in this week’s feed, and neither was a record-breaking capacity number. Coal India put out a storage tender that states both its power and its energy rating — still the exception in Indian procurement — and CTUIL published rules for making an existing battery bigger without starting the connection process again. Between them they address the two questions a supplier actually needs answered: what shape is the system, and what happens when the buyer wants more of it. Live procurements sit on our tender tracker.
Tenders: Coal India names a four-hour system
- Coal India Tenders 80 MW/320 MWh Battery Storage Projects in Odisha — Mercom India · read our brief
- Cochin Shipyard Invites Bids for Battery Storage Project — Mercom India
Coal India’s Odisha call is the week’s one procurement of scale, and it is unusually legible. Most Indian storage tenders reach the press as a megawatt-hour figure alone, leaving bidders to guess at the power rating until the documents drop. Here both numbers are stated, and 80 MW against 320 MWh fixes the ratio at four to one — a long-duration system built to move bulk energy across the evening rather than cover a short peak. Our explainer on two-hour versus four-hour systems covers why that single ratio changes the equipment count, the cell chemistry case and the bid price.
It is also the second Coal India storage tender we have tracked, after a 750 MWh call in Telangana last month. A miner procuring batteries twice in six weeks is a reasonable signal that industrial PSUs have stopped waiting for DISCOM programmes to reach them. Cochin Shipyard’s call is the smaller counterpart — a battery storage project with no capacity reported, at the stage where the specification is still being written.
Grid rules: CTUIL sets terms for making an existing battery bigger
This is the item with the longest tail. A battery’s connection agreement is granted against a stated capacity, and until there is a defined route to enlarge it, a developer who wants to add energy blocks to a live site faces the same process as a greenfield applicant. Guidelines for enhancement change the economics of phasing: a first tranche can be sized to what is bankable today, with headroom taken later against demonstrated revenue rather than a forecast. That is the practical difference between a battery designed once and a battery designed to grow, and it sits alongside the connectivity and GNA rules that govern how storage attaches to the grid in the first place. The broader regulatory picture is in our India BESS policy overview.
Worth noting what the guidelines are not: the reporting describes a procedural framework, not a capacity allocation or a tariff. No project has been enlarged on the strength of it yet.
Commissioned: ACME puts 300 MWh into service in Rajasthan
- ACME Solar commissions 66.68 MW solar and 300 MWh BESS capacity in Rajasthan — pv magazine India · read our brief
Roughly four and a half megawatt-hours of battery for every megawatt of solar — a ratio that no longer reads as a token battery attached to satisfy a dispatch clause. A block sized that way exists to shift a full day of midday generation into the evening. It is also commissioned rather than announced, which is the distinction that matters in a year where announced manufacturing capacity has been running several times ahead of what actually gets installed.
Economics: a think tank prices storage against new coal
- Rajasthan could save up to INR 85 billion in 2030 by choosing renewables-plus-storage over new coal capacity: CEEW study — pv magazine India
- Storage-plus-renewables could save Indian state $1 billion over new coal, says think tank — ESS News
- Data Center Demand to Accelerate Hybrid Renewables in Andhra Pradesh: NREDCAP — Mercom India
The CEEW finding — the same study reported by two outlets — puts a number on an argument that has mostly been made qualitatively: for Rajasthan in 2030, renewables firmed with storage come out roughly ₹85 billion ahead of building new coal capacity. Studies do not procure anything, and a state’s capacity plan answers to more than a spreadsheet. But this is the comparison that state planners are now obliged to rebut rather than ignore, and it lands in the state that is already commissioning the most solar-plus-storage. Rajasthan’s own framework is covered in our state policy note.
NREDCAP’s read on Andhra Pradesh points at the demand side of the same equation. Data centre load is round-the-clock, credit-worthy and impatient — the combination that makes a hybrid renewable-plus-storage contract easier to sign than a conventional PPA. Our note on storage for data centres in India sets out what those loads actually require of a battery.
Tender terms and deadlines change by notification — always verify the current bid documents on the issuing organisation’s portal before acting.
Sizing a battery against a tender specification, or working out what storage does to your own energy bill? Run the numbers through our BESS savings calculator, or talk to our team for a project-specific read.