Tenders & Auctions

Southern Railway Solar Infrastructure Procurement and Tender Details

May 13, 2026 By Gaurav Nathani 5 min read
0:00 / 06:01

Executive Summary: Strategic Decarbonization of Railway Assets

In alignment with the Ministry of Railways’ aggressive mandate to achieve net-zero carbon emissions by 2030, Southern Railway has launched a series of high-stakes procurement initiatives aimed at the comprehensive decarbonization of its traction and non-traction assets. These tenders represent a strategic diversification of financial and operational risk, utilizing a dual-model approach: capital-intensive “Works Contracts” for localized rooftop assets and the “Developer (RESCO) Mode” for utility-scale, land-based installations.

Concentrated primarily in the Chennai region, these projects signal a transition toward long-term Power Purchase Agreement (PPA) stability. By leveraging the Tamil Nadu Net Metering Policy, Southern Railway is not merely installing infrastructure but is optimizing its energy mix to mitigate high industrial tariffs and ensure long-term electricity cost predictability.

Project Specifications and Technical Scope

The current procurement cycle is bifurcated into immediate “ONGRID” rooftop installations and long-term land-based utility projects.

Perambur Rooftop Solar PV Portfolio (Tender No. E-E-29-I-2024-04)

  • Capacity: 2337.00 KWp (2.337 MWp).
  • Bidding Parameters: “Normal Tender” via a “Two Packet System.”
  • Ranking Logic: Evaluated on a “Lowest to Highest” expenditure basis.
  • Offer Validity: 90 Days.
  • Installation Sites: Detailed across Workshops, Railway Hospitals, Staff Quarters, and Administrative Buildings.
  • Technical Requisites: The scope encompasses the design, supply, installation, testing, and commissioning of:
    • Solar Photo Voltaic (SPV) arrays (BIS/IEC compliant).
    • Module Mounting structures.
    • Power Conditioning Units (PCU) integrated with Maximum Power Point Trackers (MPPT).
    • High-efficiency Inverters and protection controls.
    • Integrated Data Loggers for real-time performance monitoring.

Land-Based Solar Infrastructure (RESCO-2 & RESCO-3) Categorized as “Goods” procurement, these utility-scale projects (Tender Ref: E28III-SOLAR-LAND-RESCO-3 and E28III-SOLAR-LAND-RESCO-2) focus on bulk power generation for the Southern Railway grid in Chennai. These installations are designed to provide the railway with utility-scale power while offloading the technical lifecycle risk to private developers.

Operational Models: Lifecycle Management and Financial Risk

Southern Railway utilizes two distinct frameworks to balance immediate asset ownership against long-term operational efficiency:

  • Developer (RESCO) Mode: Applied to land-based projects, this model follows a 25-year PPA lifecycle. The developer is responsible for the entire DFBOT (Design, Finance, Build, Operate, and Transfer) spectrum. This minimizes initial CAPEX for the Railway while ensuring a fixed-rate power supply over two decades.
  • Works Contract (CAPEX Model): The Perambur rooftop project operates under this model, requiring a 180-day delivery timeline. Unlike the RESCO model, the Railway provides the capital expenditure upfront for an “ONGRID” system, typically resulting in a shorter maintenance tail and direct asset ownership.

Bidder Eligibility and Technical Benchmarks

The Ministry of Railways has established rigorous eligibility thresholds to ensure the technical solvency of its partners.

Requirement CategorySpecific Metric & Threshold
Similar Work ExperienceCompletion within the last 7 years of: 3 similar works at 30% value, 2 at 40% value, or 1 at 60% of the advertised value.
Technical Capacity“Similar Single Work” must demonstrate SITC of SPV systems with a capacity of at least 20% of the currently tendered capacity (approx. 467.4 KWp for Perambur).
Institutional ExperienceProjects must have been executed for Central/State Government, PSUs, or Public Listed Companies.
Public Listed CriteriaFor private-sector experience to count, the client must have been listed on NSE/BSE for ≥5 years with an average annual turnover of ₹500 Cr for the last 3 financial years.

Financial Valuation and Turnover Obligations

The Perambur rooftop tender carries an advertised value of ₹133,201,989.00. Bidders must demonstrate financial resilience through the “V/N” formula.

Annual Contractual Turnover Calculation: The minimum average annual contractual turnover is defined as the lesser of V/N or V, where V is the Advertised Value and N is the number of years for completion.

  • Correspondent’s Note: For the Perambur tender, the completion period is 180 days (N = 0.5 years). Consequently, V/N equals 2V (₹266.4M). As the criteria selects the lesser value, the effective turnover requirement for bidders is the full advertised value (₹133.2M) over the last three audited financial years.

Financial Obligations Summary

| Tender Reference | Earnest Money Deposit (EMD) | Tender Fee |

| Perambur Rooftop (E-E-29-I-2024-04) | ₹816,000.00 | ₹0.00 |

| Land-Based (E28III-SOLAR-LAND-RESCO-2) | ₹42,720,000.00 | ₹34,810.00 |

| Land-Based (E28III-SOLAR-LAND-RESCO-3) | ₹30,972,000.00 | ₹34,810.00 |

Procurement Timeline and Submission Protocols

Participation is strictly restricted to electronic bidding via the designated Railway portal. Manual offers are summarily rejected.

  • Tender E-E-29-I-2024-04 (Perambur): Closing Date: June 28, 2024 (15:00 Hrs).
  • Tender E28III-SOLAR-LAND-RESCO-2: Closing Date: May 04, 2026 (09:30 AM).
  • Tender E28III-SOLAR-LAND-RESCO-3: Closing Date: June 23, 2026 (09:30 AM).
  • Tender Portal: https://www.ireps.gov.in/

Compliance, Inspection, and “Make in India” Guidelines

Southern Railway enforces strict regulatory alignment to domestic policy and quality control:

  • Make in India Policy: Bidders must certify local content percentages in accordance with the Public Procurement Order 2017 and subsequent amendments (2017/2015/RS(G)/779/5).
  • Third-Party Inspection: Any material or single unit costing ₹5 lakhs or more must undergo mandatory inspection by RITES Ltd, with fees borne by the contractor.
  • Documentation: Bidders must submit a copy of a cancelled cheque and a completed NEFT/RTGS form for financial processing.
  • Statutory Declarations: Mandatory self-certification is required regarding non-blacklisting and compliance with restrictions on bidders from countries sharing a land border with India.

Regulatory Note: The Tamil Nadu Net Metering Advantage

Projects within the Chennai cluster benefit from the Tamil Nadu Net Metering Policy. Unlike gross metering—which is often better suited for utility-scale plants—net metering allows Southern Railway to offset high energy charges by adjusting exported solar units against daytime grid imports. This regulatory framework facilitates a highly attractive 3–5 year payback period for industrial solar installations, significantly improving the Internal Rate of Return (IRR) for CAPEX-model projects like the Perambur Workshop expansion. While peak demand charges remain, the reduction in daytime grid dependency offers critical cost control against volatile tariff hikes.

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