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Commercial Solar Rooftop ROI & 40% Accelerated Depreciation Under Section 32: Complete Business Guide

AR
Er. Abhishek Raikwar MNRE Certified
Founder & Lead Solar EPC Engineer • Updated Mar 15, 2026
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Commercial solar installations in India deliver a 2.0 to 2.8 year payback period through combined tariff savings (reducing commercial grid rates from ₹8.50+ to ₹2.00–₹2.40/unit) and 40% Accelerated Depreciation (AD) under Section 32 of the Income Tax Act, yielding up to 25%–30% immediate tax shielding in the first year.

Accelerated Depreciation
40% under Section 32 IT Act
Commercial Grid Tariff Offset
From ₹8.50/unit to ₹2.20 LCOE
Typical Commercial Payback
2.2 to 2.8 Years
25-Yr Operating IRR
32% to 44% Internal Rate of Return
100 kW Commercial Rooftop Solar EPC on Industrial Factory in Mandideep Bhopal
📷 100 kW Commercial Rooftop Solar EPC on Industrial Factory in Mandideep Bhopal

1. The Dual Engine of Commercial Solar: Energy Savings + Tax Shield

For manufacturing plants, hospitals, hotels, cold storages, and commercial real estate in Central India, electricity represents 15% to 35% of total operating overheads. Commercial and industrial (C&I) tariffs across MPMKVVCL and MPPKVVCL range between ₹7.80 and ₹9.50 per unit, plus demand charges and electricity duty.

On-site rooftop solar generates clean power at a levelized cost (LCOE) of ₹2.00 to ₹2.40 per unit over 25 years. When combined with Section 32 Accelerated Depreciation, the financial case is unbeatable.

✓ Levelized Cost of Solar Energy: ₹2.10 / kWh fixed for 25 years.
✓ DISCOM Commercial Grid Escalation: Historical inflation of 4.5%–6% annually.
✓ Direct Bottom-Line Expansion: Every ₹1 Lakh saved on power goes straight to EBITDA.

2. Understanding 40% Accelerated Depreciation (Section 32)

Under Section 32 of the Indian Income Tax Act, solar power equipment is classified as renewable energy devices eligible for 40% Accelerated Depreciation on Written Down Value (WDV) basis.

If the solar plant is commissioned before September 30th (operating for >180 days in the financial year), the full 40% depreciation can be claimed in Year 1. If commissioned after September 30th, 20% is claimed in Year 1 and the remaining 20% is carried forward to Year 2.

✓ For a Corporate Tax Rate of 25.17% (Section 115BAA): A ₹40 Lakh 100 kW solar investment yields ₹40,00,000 x 40% = ₹16,00,000 tax deduction, resulting in ₹4,02,720 in hard cash tax savings in Year 1 alone.
✓ Year 2 Written Down Value: ₹24,00,000 eligible for another 40% (₹9,60,000 deduction = ₹2,41,632 tax savings).

3. 100 kW Rooftop Solar Case Study: Mandideep Industrial Area, Bhopal

Maxira Solar engineered and commissioned a 100 kWp rooftop solar plant for an engineering components factory in Mandideep Industrial Area (Bhopal). Here are the audited financial metrics:

✓ System Capacity: 100 kWp (182 x 550Wp TOPCon Bifacial Modules)
✓ Total Turnkey Capex: ₹38,00,000 + GST
✓ Annual Generation: ~1,48,000 kWh Units
✓ Annual Grid Power Bill Savings: ₹1,48,000 units x ₹8.40 = ₹12,43,200 / year
✓ Year 1 Tax Shield (40% AD): ₹3,82,500
✓ Total Year 1 Financial Recovery: ₹16,25,700 (42.7% of total Capex recovered in 12 months)
✓ Effective Payback Period: 2.34 Years
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Slide your monthly electricity bill to calculate recommended plant kW, direct DBT subsidy, and 25-year financial returns.

MNRE DBT GUARANTEE
Direct credit to customer bank A/C
Quick Select Average Monthly Bill:
Monthly Electricity Bill ₹3,500 / mo
₹1,000 (1 kW) ₹7,000 (5 kW) ₹25,000+ (Commercial)
PM Surya Ghar Muft Bijli Yojana Structure

• 1 kW: ₹30,000 DBT  |  2 kW: ₹60,000 DBT  |  3 kW – 10 kW: ₹78,000 Flat DBT

Estimated Financial Summary
Central India Model
Recommended Capacity
3 kW System
Monthly Generation
375 Units
Direct DBT Subsidy
₹78,000
Net System Cost
₹87,000
Projected Annual Power Savings
At ₹7.5/unit average DISCOM tariff
₹37,800 / yr
Estimated Capital Payback: 2.3 Years 25-Yr Lifetime Savings: ₹9.45 Lakhs
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Solar Knowledge Base

Frequently Asked Questions

Yes! All commercial entities—including Private Limited companies, Public Limited companies, LLPs, partnership firms, and sole proprietorship businesses—owning the solar asset can claim Section 32 accelerated depreciation.
Yes. Businesses engaged in taxable outward supplies can claim 100% GST input tax credit on the solar EPC invoice (which typically attracts 13.8% composite GST under MNRE norms).
Maxira Solar designs high-elevation superstructures and solar canopies over factory parking lots, loading bays, and elevated walkways to maximize generation without restricting factory floor operations.
AR
Authored & Technically Reviewed By

Er. Abhishek Raikwar

Founder & Lead Solar EPC Engineer • MNRE Certified Professional · 10+ Yrs Rooftop EPC Experience

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