ALMM 2026 Update: Why TOPCon & HJT Solar Panels Are Replacing Mono PERC in India (Price & Efficiency Breakdown)
Key Highlights & 30-Second Takeaway
Essential facts every solar applicant in India needs to know right now:
- N-Type Dominance: MNRE ALMM expansion has accelerated domestic transition to TOPCon and HJT n-type solar technology.
- Zero Light Induced Degradation: Phosphorus-doped wafers eliminate the 2% first-year power drop seen in legacy PERC modules.
- Better Indian Summer Performance: Generates 5% to 8% more electricity during extreme 40°C–48°C summer heatwaves.
The Indian solar industry is witnessing a massive technological leap. In late 2026, the Ministry of New and Renewable Energy (MNRE) expanded the Approved List of Models and Manufacturers (ALMM), driving a decisive shift from legacy p-type Mono PERC modules toward next-generation n-type TOPCon (Tunnel Oxide Passivated Contact) and HJT (Heterojunction Technology) panels.
Domestic manufacturers including Tata Power Solar, Adani Solar, Waaree, Vikram Solar, and Goldi Solar have transitioned production lines to n-type cells, delivering module efficiencies exceeding 22.5% to 23.2%. For homeowners and commercial rooftop owners, this means significantly more power generation from limited roof space.
1. Technical Comparison: Mono PERC vs TOPCon vs HJT
| Parameter | Mono PERC (P-Type) | TOPCon (N-Type) | HJT (Heterojunction) |
|---|---|---|---|
| Module Efficiency | 20.5% – 21.3% | 22.2% – 22.8% | 22.8% – 23.5% |
| Temperature Coefficient | -0.35% / °C | -0.30% / °C | -0.26% / °C |
| Bifaciality Factor | 70% ± 5% | 80% ± 5% | 90% ± 5% |
| First Year Degradation | 2.0% | 1.0% | 1.0% |
| Annual Degradation | 0.55% / year | 0.40% / year | 0.35% / year |
| 30-Year Power Output | ~80.0% | ~87.4% | ~88.5% |
| Price per Watt (India 2026) | ₹18 – ₹21 / Wp | ₹21 – ₹24 / Wp | ₹26 – ₹30 / Wp |
Check How Many TOPCon Panels You Need
Compare rooftop space requirements for your home:
2. Space & Roof Sizing Advantage
Because TOPCon panels pack higher wattage per square meter (typically 580Wp to 620Wp per panel versus 540Wp on Mono PERC), a 3 kW or 5 kW solar plant requires 15% less shadow-free rooftop area.
Requires only 5 panels of 600W TOPCon (~180 sq. ft) instead of 6 to 7 panels of Mono PERC (~240 sq. ft).
Requires 8 to 9 panels of 590W TOPCon (~300 sq. ft), leaving ample open terrace space for rooftop leisure or gardening.
⚡ Explore Related Calculators:
Panel Efficiency Calculator Number of Panels Calculator System Cost Estimator Solar Degradation CalculatorFrequently Asked Questions