Real-World Solar & Wind
Case Studies & ROI Results
Explore how Indian industrial facilities unlocked ₹10M+ in 10-year savings, reduced carbon footprints, and optimized renewable energy investments.
Tamil Nadu · Textiles
Textile Factory Solar: ₹8.5Cr Savings in 10 Years
How a 500 kW rooftop solar plant reduced grid tariffs and unlocked tax depreciation benefits
Capacity
500 kW
Rooftop Solar CAPEX
Investment
₹2.6Cr
Payback
4.2y
10Y NPV
₹3.8Cr
CO₂ Avoided
11.2Kt
Yr1 Savings
₹0.85Cr
Project Overview
A 500 kW rooftop solar installation on a ₹400Cr annual revenue textile manufacturing facility in Tamil Nadu's Tirupur district.
Financial Performance
Total Investment: ₹2.6 Crore
Payback Period: 4.2 years
10-Year NPV: ₹3.8 Crore @ 12% discount rate
IRR: 28% (vs. 12% cost of capital)
Annual Savings: ₹85 Lakhs (energy + tax benefit)
Key Drivers
Accelerated Depreciation: 40% in Y1 under IT Act — ₹1.04 Cr tax saving
Grid Tariff Savings: ₹11/unit vs. ₹4/unit levelised cost
Rooftop Space: 3000 m² unutilized warehouse roof
State Incentive: 30% subsidy under FAME-II scheme (Tamil Nadu)
Environmental Impact
10-Year CO₂ Avoided: 11,200 tonnes (≈ 500K trees planted)
Carbon Credits: ₹25L potential revenue (I-REC @ ₹225/tCO₂)
Grid Displacement: 2,555 MWh renewable generation
Post-Implementation
The facility's energy cost per unit of textile production dropped by 18%. Post-payback (Y5–Y10), the plant generates 7–9% annualized returns on the original equity, making it a hedge against grid tariff inflation.
Timeline: 6 months design + approvals, 4 months installation, operational since Q3 2023.
"We hit payback faster than we modeled. The tax benefit was the game-changer. Now, it's a renewable energy profit center." — CFO, Tirupur Textile Mills
Karnataka · Auto Components
Automotive Supplier Wind Investment: ₹12.5L Annual Savings
Group Captive Wind: 26% Equity in a 25 MW Wind Farm
Capacity
6.5 MW Equity (26% stake)
Group Captive Wind
Investment
₹1.17Cr
Payback
5.8y
10Y NPV
₹1.56Cr
CO₂ Avoided
18.9Kt
Yr1 Savings
₹0.125Cr
Project Overview
A 26% equity stake in a 25 MW wind farm in Karnataka's Belagaum cluster, serving an automotive component supplier's 45 MWh/month demand.
Financial Structure
Equity Investment: ₹1.17 Crore (6.5 MW capacity share)
PPA Rate: ₹5.0/unit (10-year fixed)
Wind CUF: 35% (above-average site)
Payback Period: 5.8 years
10-Year NPV: ₹1.56 Crore
Annual Savings: ₹12.5 Lakhs vs. grid
Financing Route
70% debt @ 8.5% (SIDBI green loan)
30% equity → your company
Depreciation benefit (accelerated WDV) reduces equity payback to 4.2 years
Why Group Captive?
Lowest per-unit cost: Wind @ 35% CUF beats solar + open access pricing
Long-term certainty: 10-year fixed PPA vs. grid volatility
Equity upside: Post-payback, you own 26% of a renewable asset generating ₹2Cr+ annual gross revenue
Environmental & ESG
10-Year CO₂ Avoided: 18,900 tonnes
Meets Scope 2 Emissions Target: ~40% of purchased electricity is renewable
Carbon Credit Value: ₹42.5L (Gold Standard / I-REC)
Operational
Wind farm is operational, grid-tied in Tamil Nadu with power offtake via drawal rights in Karnataka under open access framework.
Status: Investment closed Dec 2023, dividend payouts began Q2 2024.
"Group captive was the sweet spot — lower cost than RESCO, no capex burden, and real ESG impact for our multinational buyers." — Procurement Head, Automotive Tier-1