Q 1. Websol Energy System Limited has been part of India’s solar sector for decades. How has the company evolved with changing solar technologies?
Websol Energy Systems Limited has evolved continuously alongside the global solar industry. Beginning with conventional crystalline silicon technologies, we have progressively upgraded our manufacturing capabilities in line with market requirements and efficiency benchmarks.
Over the years, the industry has transitioned from multi-crystalline to mono-crystalline platforms, followed by the rapid adoption of advanced architectures such as Mono PERC, bifacial, TOPCon, and back-contact technologies. Websol has strategically adapted to these transitions through phased technology upgrades, process optimization, and investments in modern manufacturing infrastructure.
Our current focus is on high-efficiency mono PERC bifacial products while simultaneously preparing for next-generation TOPCon technologies that can deliver higher conversion efficiencies, lower degradation, and improved energy yield. The company’s evolution reflects a balance between technological advancement, operational discipline, and long-term sustainability.
Q2. Websol manufactures high-efficiency Mono PERC bifacial solar cells. What are the key technologies driving this efficiency improvement?
The efficiency improvements in Mono PERC bifacial solar cells are driven by a combination of advanced wafer technology, passivation techniques, and process engineering.
Key contributors include:
• Use of high-quality mono-crystalline wafers with lower defect density.
• PERC (Passivated Emitter and Rear Cell) architecture, which reduces electron recombination losses and improves light capture.
• Advanced surface texturing and anti-reflective coatings to maximize photon absorption.
• Laser-assisted processes and optimized metallization for reduced resistive losses.
• Bifacial capability, which enables power generation from both front and rear surfaces, increasing overall energy yield in suitable installations.
• Improved process automation, inline monitoring and tighter quality controls that ensure manufacturing consistency.
Together, these technologies help achieve higher conversion efficiencies, better temperature coefficients, and enhanced long-term performance.
Q 3. How is Websol preparing for next-generation technologies such as TOPCon and advanced cell manufacturing?
The solar industry is moving rapidly toward next-generation high-efficiency technologies, and Websol recognizes the importance of staying technologically aligned with global trends.
Our approach involves a phased and disciplined transition strategy. After evaluating advanced architectures such as TOPCon, which offers higher efficiency potential and improved performance characteristics compared to conventional PERC technologies, we have initiated the upgradation of one of our 600MW PERC lines. This capacity would be further augmented by another 2.0GW TOPcon.
Key preparation areas include:
• Upgrading process equipment and manufacturing lines to support future-compatible production.
• Enhancing R&D and process-engineering capabilities.
• Strengthening collaborations across the supply chain for advanced materials and equipment.
• Building internal expertise in high-efficiency cell architectures and tighter process tolerances.
• Evaluating technology pathways that balance efficiency gains with commercial viability and scalability.
We believe India’s solar manufacturing ecosystem is entering a transition phase where technology leadership, quality consistency, and cost competitiveness will become equally important.
Q 4. What were the major challenges in scaling Websol’s additional 600 MW manufacturing capacity in West Bengal?
Scaling manufacturing capacity in today’s solar industry requires careful coordination across technology, infrastructure, supply chain, and execution timelines.
Some of the major challenges included:
• Managing longer equipment lead times for Process & Facilities.
• Ensuring timely availability of advanced manufacturing tools and utilities infrastructure.
• Recruiting and training skilled manpower for increasingly automated production environments.
• Maintaining quality consistency while ramping up throughput.
• Managing capital expenditure efficiently in a highly competitive global market environment.
• Aligning expansion timelines with evolving domestic policy frameworks and market demand.
Despite these challenges, the expansion represents an important milestone in strengthening domestic manufacturing capacity and supporting India’s broader renewable-energy objectives.
Q 5. How important are DCR-compliant modules in supporting government-led solar projects like PMKUSUM?
KUSUM and other government-led renewable initiatives play a critical role in accelerating India’s energy transition, particularly in rural and agricultural segments.
DCR (Domestic Content Requirement)-compliant modules are highly important because they encourage domestic manufacturing, reduce import dependence, and strengthen India’s solar supply chain resilience.
For programs such as PM-KUSUM, DCR-compliant products help:
• Promote self-reliance in strategic energy infrastructure.
• Support domestic manufacturing investments and employment generation.
• Improve supply-chain security and policy alignment.
• Encourage long-term ecosystem development across wafers, cells, and modules.
As India moves toward greater manufacturing localization, DCR-linked demand is expected to remain an important growth driver for domestic manufacturers.
Q6. How does Websol’s integrated cell and module manufacturing model strengthen supply-chain reliability?
An integrated manufacturing approach provides greater operational control, quality assurance, and supply-chain visibility.
By having both cell and module manufacturing capabilities, Websol is able to:
• Improve coordination between upstream and downstream production stages.
• Maintain tighter quality control and traceability.
• Reduce dependency on external sourcing for critical intermediate products like solar cells.
• Enhance delivery reliability and responsiveness to customer requirements.
• Optimize production planning and inventory management.
• Improve product customization and performance consistency.
In today’s global solar market, supply-chain reliability has become as important as pricing and efficiency, especially for large institutional and government projects.
Q7. What is Websol’s long-term vision for contributing to India’s fully integrated solar manufacturing ecosystem?
India is steadily moving toward building a comprehensive and self-reliant solar manufacturing ecosystem, and Websol aims to be an important contributor to this transformation.
Our long-term vision includes:
• Backward & Forward integration of supply chain.
• Supporting localization across the solar value chain.
• Expanding advanced cell and module manufacturing capabilities.
• Adopting next-generation high-efficiency technologies like Back Contact, HJT & Tandem.
• Strengthening quality, reliability, and global competitiveness of Indian-made solar products.
• Contributing to India’s energy security and clean-energy transition goals.
• Building sustainable manufacturing systems aligned with global environmental standards.
We believe the future of the solar industry will be shaped not only by capacity expansion, but also by technology innovation, operational excellence, and ecosystem integration. Websol intends to participate actively in this evolution while supporting India’s ambition of becoming a major global solar manufacturing hub.
