Mahananda River STP Tender: Interception, Diversion and Treatment at Siliguri (Rs 127.99 Cr)

KMDA is cleaning up the Mahananda at Siliguri with interception and diversion works plus a sewage treatment plant on hybrid annuity, and the Mahananda river STP tender closes at 2:00 PM on 18 November 2026.

Fifteen years of running, not two years of building

The work description on the portal sets out pollution abatement works for the Mahananda river at Siliguri municipal town, interception and diversion with a sewage treatment plant, including an operation and maintenance period of fifteen years, through hybrid annuity based PPP mode under Namami Gange Mission-II. The GAP Sector South Circle of the Kolkata Metropolitan Development Authority is the inviting office, reference KMDA/WS/GAP/SE,S/NIT-01/26-27.

Construction runs 730 days. Operation runs for fifteen years after that, so three quarters of this contract is about running a plant well rather than building one cheaply.

Hybrid annuity means you bring the money first

Under hybrid annuity the contractor funds part of the construction and is repaid in annuities, so you need a lender committed before you bid. EMD is ₹2,54,00,000 with no exemption, and the portal shows no tender fee. The estimate is ₹1,27,99,00,000 and bids open at 2:00 PM on 20 November 2026.

The product category on the portal reads civil and electrical works, a reminder that pumps, blowers and controls are inside your scope along with the concrete.

Trenching through a town, then building the plant

Interception and diversion means laying sewers along the river drains, which is trench work through built up Siliguri. Backhoe loaders and compact excavators do most of it, with shoring where the trench is deep and traffic diversions throughout. A small compactor puts the road back behind you.

The treatment plant itself is tank and pump house construction, so transit mixers and a crane for setting pumps and blowers.

Siliguri contractors who have done Namami Gange work in north Bengal know the ground conditions near the river, and that matters more than fleet size on a job like this.

Key facts

How to apply

1. Open the official portal: West Bengal Tenders (wbtenders.gov.in).
2. Search by tender ID 2026_KMDA_1039060_1 (reference no. KMDA/WS/GAP/SE,S/NIT-01/26-27) under the Kolkata Metropolitan Development Authority.
3. Register on the portal and keep a valid Class III digital signature certificate ready.
4. Download the bid document and the annuity terms, confirm your lender, then check eligibility and the ₹2,54,00,000 EMD.
5. Submit your bid online before 18 November 2026, 2:00 PM.

Machines for this kind of work: Pipelines and Water Supply: machines, models and comparisons

More on DesiMachines

Deep trenching in a town needs the right size machine. Compare backhoe loaders and excavators, or see equipment finance. Also live: the Trans Damodar M-sand tender in Bankura and the Belgaria STP and sewer tender at Dhanbad. Browse more live tenders in West Bengal or all live tenders.

FAQ

Tender details are summarised for convenience and may change. Always verify the latest dates, terms and documents on the official tendering portal before bidding. DesiMachines is not responsible for changes made by the issuing authority.