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Nallur and Mangalam are two of the most important industrial estate areas in Tirupur district, located on the outskirts of Tirupur city along the Avinashi road and Palladam road corridors respectively. These areas have developed rapidly over the past two decades as Tirupur's knitwear industry expanded outward from the congested town centre, seeking larger factory plots, better road access, and modern infrastructure. Today, Nallur and Mangalam host hundreds of garment manufacturing units, dyeing factories, printing facilities, and logistics centres that form critical nodes in Tirupur's textile supply chain.
For the industrial operators and growing residential communities in Nallur and Mangalam, solar installation in Nallur Mangalam, Tirupur is a high-return investment. The industrial estates offer the ideal combination for solar: large factory buildings with expansive unshaded roofs, extremely high electricity consumption on industrial tariff, and relatively newer construction with strong structural capacity. With Tirupur's solar irradiance averaging 5.0-5.4 kWh/m2/day, these industrial areas represent some of the highest-value solar installation opportunities in all of Tamil Nadu.
Nallur and Mangalam's Industrial and Property Profile
Garment Manufacturing Units
The dominant industry across both areas:
- Large export units: Vertically integrated garment factories with cutting, stitching, finishing, and packing under one roof, occupying 20,000-1,00,000 sq ft plots with factory sheds of 10,000-50,000 sq ft
- Contract stitching units: Medium-scale operations with 100-500 sewing machines consuming 5,000-20,000 units/month
- Knitting factories: Circular and flat knitting machines operating 24/7 in purpose-built sheds
- Garment printing units: Screen printing and digital printing facilities with specialised lighting and curing equipment
Dyeing and Processing Units
Nallur and Mangalam host some of Tirupur's newer dyeing facilities:
- Modern dyeing houses: Built to comply with zero liquid discharge (ZLD) norms, with HT connections consuming 50,000-3,00,000 units/month
- Bleaching and finishing units: Chemical processing facilities with large shed roofs
- Common effluent treatment plants (CETPs): Serving clusters of smaller dyeing units, with continuous high electricity consumption for treatment processes
Logistics and Warehousing
- Export warehouses: Large flat-roofed buildings storing finished garments before shipping — ideal for solar with minimal roof obstructions
- Container freight stations (CFS): Logistics hubs with extensive yard areas suitable for solar carports
- Cold storage and climate-controlled facilities: Maintaining specific temperature and humidity for garment storage
Emerging Residential Areas
As the industrial estates have grown, residential communities have followed:
- Worker housing: Apartment complexes and hostel buildings housing the textile workforce
- Residential layouts: New DTCP-approved layouts for factory owners, supervisors, and the growing middle class, with plots of 1,200-2,400 sq ft
- Mixed-use developments: Commercial ground floors with residential upper floors along the main approach roads
TANGEDCO Procedures for Nallur and Mangalam
Nallur and Mangalam fall under the TANGEDCO Tirupur Distribution Circle.
Key TANGEDCO Offices
- Section Offices: Nallur and Mangalam are served by Tirupur North and Tirupur East section offices respectively
- Sub-Division: Tirupur North Sub-Division
- Distribution Circle: Tirupur Electricity Distribution Circle (EDC)
- Superintending Engineer: Tirupur Region
Net Metering for Industrial Installations
- Application and design submission: File at the respective section office with detailed system design, single-line diagram, load analysis, and MNRE-registered vendor credentials
- Feasibility and grid study: TANGEDCO assesses transformer capacity, fault current, and grid stability — critical in industrial areas with high existing load (20-30 days for LT; 30-45 days for HT)
- CEIG approval: Required for HT connections and systems exceeding 10 kW
- Installation and safety testing: Complete installation with mandatory safety testing and third-party inspection for larger systems
- Meter installation: Bidirectional net meter or export meter installed by TANGEDCO (30-60 days post-commissioning)
Nallur-Mangalam Specific Notes
- The industrial estate areas have relatively modern grid infrastructure designed for heavy industrial loads — this generally supports large solar injection
- However, transformer-level capacity constraints may arise in areas where multiple factories are already on a single transformer. Feasibility study is critical
- For systems above 100 kW, engage directly with the Tirupur EDC office for technical coordination
- Large industrial consumers (above 1,00,000 units/month) should evaluate open access solar or group captive power plant options alongside rooftop solar
Costs and Savings
Solar Generation in the Tirupur Industrial Belt
| Parameter | Nallur/Mangalam, Tirupur | Tamil Nadu Average |
|---|---|---|
| Annual irradiance | 5.0-5.4 kWh/m2/day | 4.8-5.1 kWh/m2/day |
| Average daily generation per kWp | 4.2-4.5 units | 3.8-4.2 units |
| Annual generation per kWp | 1,530-1,640 units | 1,380-1,500 units |
| Monsoon impact (Oct-Dec) | Moderate (15-25% reduction) | Varies by region |
Residential System Costs and ROI
| System Size | Net Cost (after subsidy) | Monthly Generation | Monthly Savings | Payback Period |
|---|---|---|---|---|
| 3 kW | Rs 70,000-1,00,000 | 380-410 units | Rs 2,000-3,000 | 3-4 years |
| 5 kW | Rs 2,00,000-2,70,000 | 640-690 units | Rs 4,000-5,500 | 4-4.5 years |
| 8 kW | Rs 3,70,000-4,70,000 | 1,020-1,100 units | Rs 6,800-9,200 | 4-5 years |
| 10 kW | Rs 4,70,000-6,00,000 | 1,280-1,370 units | Rs 8,800-11,500 | 4-5 years |
Industrial System Costs (Without Subsidy)
| System Size | Approximate Cost | Monthly Generation | Monthly Savings (at Rs 8/unit) | Payback Period |
|---|---|---|---|---|
| 50 kW | Rs 23,00,000-28,00,000 | 6,400-6,800 units | Rs 51,200-54,400 | 4-5 years |
| 100 kW | Rs 42,00,000-50,00,000 | 12,800-13,700 units | Rs 1,02,400-1,09,600 | 3.5-4.5 years |
| 250 kW | Rs 1,00,00,000-1,20,00,000 | 32,000-34,200 units | Rs 2,56,000-2,73,600 | 3.5-4 years |
| 500 kW | Rs 1,90,00,000-2,25,00,000 | 64,000-68,300 units | Rs 5,12,000-5,46,400 | 3.5-4 years |
Typical Nallur Garment Factory Scenario
Scenario: Export garment factory with 300 stitching machines, cutting and packing sections, LT industrial connection, monthly consumption 15,000 units at Rs 8.50/unit, 60 kW rooftop system on factory shed
| Parameter | Value |
|---|---|
| System cost | Rs 28,00,000 |
| Monthly generation | 7,680 units |
| Monthly savings | Rs 65,280 |
| Annual savings | Rs 7,83,360 |
| Consumption offset | 51% |
| Payback period | 3.6 years |
| 25-year savings | Rs 1.96 crore |
Typical Mangalam Dyeing Unit Scenario
Scenario: Modern ZLD-compliant dyeing unit, HT connection, monthly consumption 1,50,000 units at Rs 7.50/unit, 400 kW rooftop system
| Parameter | Value |
|---|---|
| System cost | Rs 1,56,00,000 |
| Monthly generation | 51,200 units |
| Monthly savings | Rs 3,84,000 |
| Annual savings | Rs 46,08,000 |
| Consumption offset | 34% |
| Payback period | 3.4 years |
| 25-year savings | Rs 11.52 crore |
Area-Specific Considerations
Factory Shed Rooftop Installations
Nallur and Mangalam's modern factory buildings offer ideal conditions for large-scale rooftop solar:
- Structural capacity: Newer factory sheds are designed with higher structural margins — most can support solar panel loads (15-20 kg/sqm) without reinforcement
- Long uninterrupted spans: Factory roofs spanning 30-100 metres provide continuous mounting surfaces with no obstructions
- Existing crane rails and structural steel: Mounting systems can often integrate with existing roof purlins and structural members, reducing installation costs
- Roof orientation: Most factory sheds in the industrial estates are oriented east-west with north-south facing roof slopes — the south-facing slope is optimal for solar panel installation
Multi-Building Campus Installations
Larger factories in Nallur and Mangalam occupy campus-style plots with multiple buildings:
- Design the solar system to cover all building rooftops from a single inverter room, optimising cable runs and inverter sizing
- Prioritise buildings with the least shading and best structural condition
- Consider solar carports over parking areas to add generation capacity beyond rooftop limits
- A single net metering application can cover the entire campus if all buildings share the same service connection
ZLD Compliance and Solar
Tirupur's dyeing industry is mandated to operate Zero Liquid Discharge systems — which are themselves massive electricity consumers:
- ZLD systems in Nallur and Mangalam consume 15-30% of a dyeing unit's total electricity
- Dedicating a portion of the rooftop solar array to offset ZLD electricity costs is a sound financial strategy
- The consistent daytime operation of ZLD equipment aligns well with solar generation hours
Dust and Industrial Pollutant Impact
- Industrial areas have higher particulate matter levels from factory operations, vehicle movement, and construction activity
- Expect 8-12% higher soiling losses compared to clean residential areas if panels are not cleaned regularly
- Recommended cleaning frequency: Every 2 weeks during dry months
- Automated cleaning systems (robotic or spray-based) are cost-effective for installations above 100 kW
Nallur and Mangalam Landmarks and Context
- Nallur Industrial Area: Concentrated garment manufacturing zone along the Avinashi road corridor — some of Tirupur's largest export units are located here
- Mangalam Industrial Cluster: Processing and finishing units along the Palladam road approach
- SIDCO Nallur: SIDCO-developed industrial plots with standardised infrastructure
- Avinashi Road (NH544): National highway providing connectivity — properties along this corridor have excellent grid infrastructure
- Emerging residential zones: New apartment and layout developments serving the industrial workforce
- Tirupur Export Knitwear Industrial Complex (TEKIC): Nearby planned industrial complex
Next Steps for Nallur and Mangalam Industrial Operators
Nallur and Mangalam represent the highest absolute savings opportunity for solar in Tirupur district. Factory buildings with large roofs and high electricity consumption translate directly into crore-level savings over a 25-year solar system lifespan. Even smaller garment units save nearly Rs 2 crore over 25 years. The investment case is overwhelming.
- Calculate your savings with our online tool — enter your monthly industrial consumption to see the potential
- Request a free site assessment — our Tirupur industrial solar team will survey your factory, conduct structural and electrical assessments, and deliver a bankable proposal
- Think big: With payback periods under 4 years and 25-year savings in the crores, undersizing your solar system is the biggest mistake you can make. Maximise roof coverage for maximum returns
Tristar specialises in large-scale industrial solar installations in the Tirupur belt, with expertise in factory shed rooftop systems, dyeing unit corrosion-resistant installations, and TANGEDCO HT net metering approvals. We manage every aspect from engineering design to commissioning.
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