Quick Answer: A 100kW solar system for a Tirupur textile factory costs ₹35-40 lakh and saves ₹1.5-2 lakh/month on TANGEDCO HT tariffs. With 40% accelerated depreciation, effective payback is 2-2.5 years. Larger units (500kW+) can use open access solar for even greater savings.

Tiruppur and Erode together form the backbone of India's knitwear and textile export industry, contributing over ₹50,000 crore annually to the national economy. But behind every meter of fabric lies a staggering electricity bill — one that's increasingly unsustainable as TANGEDCO tariffs climb year over year.

For textile factory owners operating on HT (High Tension) connections, electricity is often the single largest operational expense after raw materials. The dual burden of demand charges and energy charges under TANGEDCO's HT tariff structure makes textiles one of the most electricity-cost-sensitive industries in Tamil Nadu.

This guide breaks down exactly how solar energy addresses both components of your HT bill, with real cost analysis for Tiruppur and Erode textile units.

Tiruppur Textile Industry: The Electricity Consumption Profile

Tiruppur is home to over 6,000 textile units ranging from small knitting operations to massive integrated dyeing-and-garment complexes. The city processes approximately 3,500 tonnes of fabric daily, and the electricity demand reflects this scale.

Typical Electricity Consumption by Unit Type

Unit Type	Typical Connected Load	Monthly Consumption	Monthly EB Bill (Approx.)
Small knitting unit	30–80 kW	8,000–20,000 kWh	₹60,000–₹1,60,000
Medium garment/stitching unit	50–150 kW	15,000–45,000 kWh	₹1,20,000–₹3,60,000
Dyeing unit (small)	100–300 kW	40,000–1,20,000 kWh	₹3,20,000–₹9,60,000
Dyeing unit (large/integrated)	500 kW–2 MW	2,00,000–8,00,000 kWh	₹16,00,000–₹64,00,000
Integrated textile complex	1–5 MW	5,00,000–20,00,000 kWh	₹40,00,000–₹1,60,00,000

The key takeaway: electricity costs account for 25–40% of total production costs in dyeing units and 15–25% in knitting and garment units. Even a modest reduction translates to significant savings at the factory level.

Peak Demand Patterns

Textile factories in Tiruppur typically operate in two or three shifts. Dyeing units run boilers and jet dyeing machines that draw massive power during heating cycles. The peak demand often occurs between 10 AM and 4 PM — which coincidentally is when solar generation is at its highest.

This alignment between solar generation and peak industrial demand is what makes textiles an ideal candidate for solar adoption.

Understanding HT Tariff: Demand Charges + Energy Charges

If you're on an HT connection (above 112 kVA), your TANGEDCO bill has two major components that most factory owners don't fully optimize.

Component 1: Demand Charges

TANGEDCO levies a demand charge based on your maximum demand recorded in a billing cycle, measured in kVA.

HT Industrial tariff (2025-26): ₹350 per kVA per month
This is charged on the higher of: (a) your actual maximum demand recorded, or (b) 90% of your sanctioned demand

For a textile unit with a sanctioned demand of 500 kVA, even if you only use 450 kVA at peak, you're paying:

500 kVA × 0.9 × ₹350 = ₹1,57,500/month in demand charges alone

Component 2: Energy Charges

The energy charge is based on actual kWh consumed, and for HT industrial consumers in Tamil Nadu:

Consumption Slab	Rate (per kWh)
Base rate	₹6.35
TOD surcharge (peak hours 6 PM–10 PM)	+20%
TOD discount (off-peak 10 PM–6 AM)	-5%

Additional levies include fuel cost adjustment charges (FPPCA), electricity tax (5%), and wheeling charges — pushing effective cost to ₹7.50–₹8.50 per kWh for most industrial consumers.

How Solar Reduces Both Components

Reducing energy charges: Every unit of solar power generated on your rooftop directly offsets grid consumption. At a levelized cost of ₹2.50–₹3.50 per kWh (over 25 years), solar provides savings of ₹4.00–₹6.00 per unit consumed.

Reducing demand charges: This is the less obvious but equally powerful benefit. When solar generates power during peak demand hours (10 AM–4 PM), your maximum demand drawn from the grid drops. If a 200 kW solar system is generating 160 kW at the time your factory demand peaks at 500 kW, TANGEDCO's meter records only 340 kW demand from the grid.

Over 12 months, this demand reduction can save:

160 kVA reduction × ₹350/kVA × 12 months = ₹6,72,000/year in demand charges alone

Solar System Sizing for Different Textile Operations

Dyeing Units: High Energy, High ROI

Dyeing units are the most electricity-intensive segment of the textile value chain. Jet dyeing machines, softener mixing units, and effluent treatment plants (ETPs) consume power round the clock.

Recommended system size: 100–500 kW (rooftop) or 500 kW–2 MW (open access)

A typical medium dyeing unit with 200 kW connected load and a monthly consumption of 80,000 kWh can install a 200 kW rooftop solar system that generates approximately 26,000–28,000 kWh per month, offsetting roughly 33% of total consumption.

Annual savings: ₹18,00,000–₹22,00,000

Knitting and Garment Units: Moderate Consumption, Fast Payback

Knitting machines (circular and flat-bed) draw consistent power but at moderate levels. Garment stitching units have lower consumption but benefit from the demand charge reduction.

Recommended system size: 50–150 kW

A 100 kW system on a knitting unit generates about 13,000–14,000 kWh per month, covering 40–60% of a typical unit's consumption.

Annual savings: ₹8,00,000–₹12,00,000

Detailed Cost Analysis: 100 kW System for a Textile Unit

Here's a realistic cost breakdown for a 100 kW rooftop solar system installed on a textile factory in Tiruppur or Erode:

Item	Cost
Solar panels (100 kW, DCR-compliant)	₹30,00,000
Inverter (string type, industrial grade)	₹6,00,000
Mounting structure (MS hot-dip galvanized)	₹5,00,000
Cables, connectors, junction boxes	₹2,50,000
Net metering equipment	₹1,00,000
Installation and commissioning	₹3,50,000
TANGEDCO approval and documentation	₹50,000
Total project cost	₹48,50,000
Cost per kW	₹48,500/kW

Generation and Savings Estimate

Parameter	Value
Annual generation	1,55,000–1,65,000 kWh
Grid electricity cost saved	₹8.00/kWh (effective)
Annual energy savings	₹12,40,000–₹13,20,000
Annual demand charge savings	₹3,00,000–₹4,00,000
Total annual savings	₹15,40,000–₹17,20,000
Payback period	2.8–3.2 years
25-year ROI	700–800%

Use our solar savings calculator to get a customized estimate for your specific factory load profile.

Open Access Solar for Larger Units (500 kW+)

For large textile units and integrated complexes consuming more than 2,00,000 kWh per month, open access solar offers even greater savings. Under this model, a solar plant is set up at a separate location (often within the same district) and power is wheeled through TANGEDCO's grid to your factory.

Open Access Economics for Textiles

Parameter	Value
System size	1 MW
Capital cost	₹3.8–4.2 crore
Annual generation	16,00,000–17,00,000 kWh
Wheeling and transmission charges	₹1.50–₹2.00/kWh
Effective solar cost (delivered)	₹4.00–₹5.00/kWh
Grid cost saved	₹8.00–₹8.50/kWh
Net savings per kWh	₹3.50–₹4.50
Annual savings	₹56,00,000–₹72,00,000

Tamil Nadu's open access policy allows industrial consumers with a sanctioned load of 1 MW and above to purchase renewable power directly. The Cross-Subsidy Surcharge (CSS) exemption for solar makes this economically viable.

Case Study: Typical Tiruppur Knitwear Factory

Factory profile:

Type: Knitting + garment manufacturing
Connected load: 250 kW (HT connection)
Monthly consumption: 60,000 kWh
Monthly EB bill: ₹4,80,000 (including demand charges)
Available rooftop area: 1,200 sq. m.

Solar installation:

System size: 150 kW rooftop
Project cost: ₹72,00,000
Financing: 70% term loan at 8.5% interest (7-year tenure)

Results after commissioning:

Monthly solar generation: 19,500 kWh
Grid consumption reduced to: 40,500 kWh/month
Peak demand reduction: ~120 kVA
New monthly EB bill: ₹3,24,000
Monthly savings: ₹1,56,000
Annual savings: ₹18,72,000
EMI on loan: ₹1,09,000/month
Net monthly benefit (even during loan repayment): ₹47,000
Payback period: 3.8 years (considering loan interest)
Post-loan annual savings (year 8 onwards): ₹18,72,000

Erode Textile Wholesale Market: Commercial Solar Opportunity

Erode's wholesale textile market is one of the largest in South India, with thousands of commercial establishments. While individual shops have modest consumption (500–2,000 kWh/month), the aggregated demand across the market is enormous.

Solar opportunities in Erode's textile market:

Individual showroom rooftops: 5–20 kW systems reducing AC and lighting costs
Market complex rooftops: 50–200 kW shared systems with proportional allocation
Cold storage and warehousing: 30–100 kW systems for textile storage facilities
Textile processing clusters: Group captive models for collocated units

Commercial establishments in Erode pay ₹8.50–₹10.00 per kWh under TANGEDCO's commercial tariff — making the ROI on solar even more attractive than industrial units.

Group Captive Solar for Textile Clusters

The group captive model is gaining traction among Tiruppur and Erode textile associations. Under this model:

A group of textile units collectively invest in a solar plant (typically 1–10 MW)
Each unit holds at least 26% equity in the project
Power is wheeled to individual factories at a fraction of grid cost
Cross-subsidy surcharge and additional surcharge are exempted

Benefits for textile clusters:

Economies of scale reduce per-kW cost by 15–20%
Smaller units that can't individually qualify for open access can participate
Association-level coordination simplifies project management
Shared O&M costs reduce ongoing expenses

The Tiruppur Exporters' Association (TEA) and the South India Hosiery Manufacturers' Association have been instrumental in facilitating group captive solar projects for their members.

Financing Options for Textile Factory Solar

Option 1: Term Loan + Accelerated Depreciation

Parameter	Details
Loan amount	Up to 80% of project cost
Interest rate	8–10% (priority sector lending)
Tenure	5–10 years
Accelerated depreciation	40% in first year
Tax benefit (30% bracket)	~12% of project cost as year-1 tax saving
Effective cost after tax benefit	Reduced by ₹5,00,000–₹6,00,000 for a 100 kW system

Option 2: OPEX/PPA Model (Zero Upfront Cost)

Under this model, a solar developer installs the system on your rooftop at no cost. You sign a Power Purchase Agreement (PPA) to buy solar power at ₹3.50–₹4.50/kWh for 15–25 years.

Advantages: No capital expenditure, immediate savings from day one Disadvantages: Lower total savings over 25 years compared to CAPEX model

Option 3: RESCO (Renewable Energy Service Company)

Similar to OPEX but with additional O&M services bundled in. The RESCO handles everything from installation to maintenance, and you pay a fixed per-unit rate.

ROI Comparison Table by Factory Size

Factory Type	System Size	Project Cost	Annual Savings	Payback (CAPEX)	25-Year Net Savings
Small knitting unit	50 kW	₹24,50,000	₹8,50,000	2.9 years	₹1.88 crore
Medium garment unit	100 kW	₹48,50,000	₹16,00,000	3.0 years	₹3.52 crore
Small dyeing unit	200 kW	₹94,00,000	₹34,00,000	2.8 years	₹7.56 crore
Large dyeing unit	500 kW	₹2,25,00,000	₹85,00,000	2.6 years	₹19.00 crore
Integrated complex (open access)	1 MW	₹4,00,00,000	₹65,00,000	6.2 years	₹12.25 crore

Note: Open access payback is longer due to wheeling charges, but total savings remain substantial for very large consumers.

Getting Started: Next Steps for Textile Factory Owners

Assess your rooftop area — a 100 kW system needs approximately 600–700 sq. m. of shadow-free rooftop
Review your last 12 months of EB bills — identify your average consumption, maximum demand, and peak demand timing
Get a site survey — contact Tristar Energy for a free technical and financial assessment
Evaluate financing options — CAPEX with loan, OPEX/PPA, or group captive based on your financial position
Apply for TANGEDCO net metering — Tristar handles the complete application and approval process

The textile industry in Tiruppur and Erode is at a tipping point. With electricity tariffs increasing 5–8% annually and solar costs declining, the financial case for solar has never been stronger. Every month of delay is money left on the table.

Get a free solar assessment for your textile factory or calculate your savings instantly.

Solar for Textile Factories | Tirupur & Erode