Energy Efficiency Services Limited (EESL) issued an Invitation for Bids (IFB) on March 30, 2026, for the turnkey development of a Lithium Iron Phosphate (LFP) Battery Energy Storage System (BESS). The project involves the deployment of a distributed 120 kW BESS designed to enhance grid stability and renewable energy integration in the high-altitude region of Sikkim. This procurement emphasizes a fully integrated system approach to manage localized energy demands and intermittent renewable supply.
Technical Scope of Work
The project is structured as a comprehensive turnkey contract. The selected bidder is responsible for the following technical and operational requirements:
- Executing complete system design and engineering.
- Procuring and supplying all fully integrated BESS components.
- Performing site installation, comprehensive testing, and commissioning.
- Providing bidirectional Power Conditioning Systems (PCS/inverters) to manage energy flow for grid stability.
- Managing logistics, including transportation and secure on-site storage.
- Securing transit and all-risk insurance coverage until the formal project handover.
Project Specifications and Performance Standards
The selection of LFP chemistry for this deployment is technically predicated on its thermal stability. In the Indian context, LFP is preferred for its ability to maintain performance at ambient temperatures exceeding 45°C–50°C, providing a distinct safety and lifecycle advantage over Nickel Manganese Cobalt (NMC) chemistries in rugged terrains.
| Parameter | Specification |
| Tender Reference Number | EESL/06/2025-26/BESS/OTE/252612002 |
| Project Nature | Turnkey (Design, Supply, Installation, and Commissioning) |
| Battery Chemistry | Lithium Iron Phosphate (LFP) |
| System Configuration | 120 kW / 6-hour duration |
| Project Site | New Melli, Sikkim |
| Executing Agency | EESL (Purchaser Ownership: Noida, Uttar Pradesh) |
| Battery Warranty | 5 years from the date of commissioning |
| Balance of System (BoS) Warranty | 12 months from commissioning or 18 months from delivery (earlier) |
| Execution Timeline | Completion within three months of Letter of Award (LOA) |
Bidding Timeline and Submission Procedures
The procurement follows a structured timeline for technically qualified bidders. The milestones are as follows:
- Invitation for Bids (IFB) Issued: March 30, 2026.
- Online Pre-bid Meeting: April 9, 2026, at 11:00 AM IST via Microsoft Teams.
- Bid Submission Deadline: April 20, 2026, by 11:00 AM IST (submission of soft copy online and physical hard copy).
- Techno-Commercial Bid Opening: April 20, 2026, at 11:30 AM IST.
- Selection Method: Single-stage, two-envelope system based on the lowest cost (L-1) criteria.
Financial Requirements
Participating bidders must adhere to the following financial obligations:
- Tender Document Fee: Rs. 20,000 (non-refundable).
- Earnest Money Deposit (EMD): Rs. 4,75,000.
- Performance Bank Guarantee: 5% of the total contract value, to be submitted within 28 days of the Notification of Award.
Submission and Inquiry Instructions
Prospective bidders are required to submit all queries and requests for clarification through the EESL e-procurement portal within four days of the tender issuance. Bids must be partitioned into two envelopes: one for techno-commercial details and the second for the financial proposal. Eligibility is strictly contingent upon adherence to the technical criteria and performance standards defined in Tender Reference No. EESL/06/2025-26/BESS/OTE/252612002.
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