EESL Invites Bids for 120 kW BESS Project in Sikkim

Energy Efficiency Services Limited (EESL), a joint venture of Public Sector Undertakings under the Ministry of Power, has released a tender for the development of a 120 kW / 6-hour Battery Energy Storage System (BESS) at New Melli, Sikkim. The project involves turnkey design, supply, testing, installation, and commissioning, fully funded through domestic resources.

Bids are invited via a single-stage, two-envelope system, with technical and financial proposals submitted separately. Only technically qualified bidders will have their financial proposals evaluated.

Tender Overview

Tender Title: Development of 120 kW / 6-hour BESS at New Melli, Sikkim
Total BESS Capacity: 120 kW with 6-hour storage
Technology: Lithium-Ion Battery Energy Storage System
Bidding Route: EPC, Single-Stage Two-Envelope System
Issuing Authority: Energy Efficiency Services Limited (EESL)

Project Location

Location: New Melli, Sikkim
Pre-Bid Meeting Venue: EESL Corporate Office, 1st to 4th Floor, IKON Tower, Film City, Sector 16A, Noida, Uttar Pradesh – 201301 (Online participation available)

Technical Specifications

System Architecture: Turnkey EPC delivery including design, engineering, supply, installation, testing, and commissioning

Key Components:

Battery Management System (BMS)
Energy Management System (EMS)
Power Conversion System (PCS)
Civil and electrical works
Auxiliary systems and fire safety

Performance Requirements:

5-year warranty for battery components
12-month (or 18-month from delivery) warranty for Balance of System (BoS) components
Completion within 3 months from Letter of Award (LOA)

Key Dates & Bid Conditions

Pre-Bid Meeting: 19 December 2025 at 11:00 AM IST
Bid Submission Deadline: 30 December 2025 at 11:00 AM IST (both online & hard copy)
Opening of Envelope-1 (Technical Bid): 30 December 2025 at 11:30 AM IST
Opening of Envelope-2 (Financial Bid): After technical evaluation
Tender Fee: ₹20,000 (non-refundable)
Bid Security / EMD: ₹500,000

Eligibility & Requirements

Open to domestic EPC contractors
Contractors must meet technical and financial qualification criteria
Turnkey delivery capability required, including installation, testing, commissioning, and warranty obligations

Project Significance

The New Melli BESS project strengthens India’s energy storage infrastructure in strategic regions like Sikkim, enhancing grid stability and reliability. It reflects EESL’s commitment to advanced energy storage solutions and sustainable energy development.