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Maharashtra clarifies its mandatory storage rules; West Bengal clears a ₹20 billion floating solar-storage project — 18 September 2026

Maharashtra has clarified how its mandatory energy storage requirement applies to renewable projects, the most consequential item in the feed to 18 September 2026. West Bengal's regulator cleared a ₹20 billion floating solar-storage project, Ahmedabad's municipal body floated a solar-plus-storage tender, and Exide tied up with Germany's ExCom on industrial batteries.

Published 18 September 2026 · Last updated 18 September 2026 · 4 min read · By Alpha Devraj ESS Research Desk

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No new capacity numbers landed in today’s feed, which makes it a useful day to look at the machinery behind the numbers instead. Three of the four fresh items are the same battery requirement seen at three different stages — written as a rule in Maharashtra, applied to a specific project in West Bengal, and turned into a bid document in Ahmedabad. Live procurements with published capacities sit on our tender tracker.

One requirement, three stages — today’s state itemsHow a storage mandate turns into procurable capacity — feed to 18 September 2026STAGE 1 · THE RULEMaharashtraClarifies how mandatorystorage applies to renewablesSTAGE 2 · THE PROJECTWest BengalRegulator clears a ₹20 bnfloating solar-storage schemeSTAGE 3 · THE TENDERAhmedabadMunicipal body floats asolar-plus-storage tenderStages are the story type of each headline in today’s feed, not a sequence linking these three specific projects.No capacity figures were reported for the West Bengal or Ahmedabad items.
Today's state-level items are one storage requirement caught at three stages — a rule, a project clearance, and a tender — rather than three unrelated stories.

Policy: Maharashtra says what its storage mandate actually means

A storage mandate is only as real as its definitions. Once a state requires renewable projects to carry batteries, the arguments move immediately to the fine print: which projects are covered, whether the requirement is written against power or energy, whether existing approvals are grandfathered, and who verifies compliance. A clarification is therefore worth more to a supplier than the original notification was — it is the point at which a policy line becomes a quantity someone has to buy. Maharashtra’s wider framework, including its procurement record, is in our state policy note, and the national obligation it sits under is covered in energy storage obligations in India.

Worth reading the reporting narrowly: this is a clarification of existing rules, not a new target or an allocation. Nothing has been tendered on the strength of it.

States: West Bengal clears ₹20 billion of floating solar-storage, Ahmedabad goes to market

Neither headline reports a megawatt-hour figure, so both stay as entries here rather than getting their own specification brief — we do not publish a capacity we cannot source. What the West Bengal item does establish is the size of the cheque: ₹20 billion is a state-scale commitment, and a regulatory clearance is the gate at which a floating-solar scheme stops being a proposal and starts being a procurement. West Bengal has been an active storage buyer this year — the state’s framework and its earlier 3 GWh POWERGRID call are covered in our West Bengal policy note.

Ahmedabad’s tender is the smaller story with the shorter fuse. Municipal bodies buying solar-plus-storage directly, rather than waiting for the state utility to aggregate demand, is the pattern that turns a mandate into a stream of modest, bankable packages — and municipal load profiles, heavy on water pumping and street lighting, are a natural fit for a battery that shifts midday solar into the evening.

Supply chain: Exide takes industrial batteries into Europe

No capacities, no investment figure and no timeline in the reporting, so treat this as a direction of travel rather than an event. The direction is still notable: Indian battery makers have spent the past two years building capacity against domestic demand, and a distribution tie-up into the European Economic Area is an early sign that some of that output is being aimed outward. For context on how much domestic manufacturing is actually under construction, see our note on India’s battery import dependence.

Still live from this week

Coal India’s Odisha call remains the largest open procurement in the current feed, and the only one this week that states both a power and an energy rating — 80 MW against 320 MWh, a four-hour system. Our explainer on two-hour versus four-hour systems covers what that ratio changes for a bidder. Cochin Shipyard’s smaller call is still at the stage where no capacity has been reported.

Tender terms and deadlines change by notification — always verify the current bid documents on the issuing organisation’s portal before acting.


Working out what a state storage mandate means for your own site, or sizing a battery against a tender specification? Run the numbers through our BESS savings calculator, or talk to our team for a project-specific read.

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