Why in the News?
India’s rooftop solar (RTS) capacity has gone beyond 17 GW, showing good progress in using clean energy in cities. But in crowded urban areas, there isn’t enough space for more rooftop solar panels.
What is Building-Integrated Photovoltaics (BIPV)?
BIPV refers to the integration of photovoltaic materials directly into the building envelope (e.g., façades, roofs, windows). It serves both as a building material and a solar power generator. Eg: Façades, curtain walls, glass windows, skylights, tiles, railings, balconies, canopies, atriums, and shading devices.
How does it differ from traditional rooftop solar systems?
| Traditional Rooftop Solar (RTS) | Building-Integrated Photovoltaics (BIPV) | |
| Installation | Added onto rooftops | Embedded into building structure |
| Space Use | Limited to rooftop area | Uses entire building envelope (walls, windows etc.) |
| Aesthetic | Usually visible, can affect aesthetics | Customisable, aesthetically integrated |
| Function | Only generates electricity | Generates electricity + serves as a building material |
| Retrofitting | Often retrofitted | Typically integrated during design/build phase |
Why is BIPV particularly important for densely populated urban areas in India?
- Limited Rooftop Space in High-Rises: In densely populated cities, tall buildings with small rooftops cannot accommodate large rooftop solar (RTS) systems. Eg: A 16-storey building with a 4,000 sq. ft rooftop can install only a 40 kWp RTS system, but its south-facing façade can support 150 kWp BIPV panels.
- Efficient Use of Building Surfaces: BIPV allows power generation from vertical and horizontal surfaces like façades, windows, and balconies, thus using more surface area. Eg: Façade areas of buildings are often 3–4 times larger than rooftop areas, offering greater solar potential.
- Supports Sustainable Urban Growth: With India’s urban population projected to reach 850 million by 2051, BIPV enables renewable energy adoption in future infrastructure. Eg: Integration of BIPV in new public infrastructure (e.g., metro stations, airports) can reduce carbon footprint.
- Energy Access for Non-Rooftop Households: Residents in multi-storey apartments without rooftop access can still benefit from solar energy via BIPV on balconies, railings, or windows. Eg: In Germany, 15 lakh households use balcony solar panels, reducing electricity bills by up to 30%.
- Aesthetic and Space-Neutral Design: BIPVs blend into building designs without occupying extra space or affecting aesthetics, which is ideal for space-constrained urban settings. Eg: The Renewable Energy Museum in Kolkata has a solar-powered dome with over 2,000 integrated panels, combining function with form.
What challenges are limiting the adoption of BIPVs in India?
- High Initial Costs: BIPV systems are more expensive than traditional rooftop solar due to integration with building materials and use of advanced technology.
- Policy and Regulatory Gaps: Lack of clear policies, mandates, and incentives specific to BIPV hinders its integration into mainstream construction practices. Eg: Unlike Europe’s Energy Performance of Buildings Directive, India’s National Building Code does not yet mandate or promote BIPV use.
- Low Awareness and Technical Capacity: Architects, builders, and homeowners are often unaware of BIPV’s benefits or how to incorporate it effectively in design.
- Dependence on Imports and Limited Domestic Manufacturing: India relies heavily on imported BIPV components, increasing costs and reducing supply reliability. Eg: Specialised BIPV glass panels or semi-transparent modules are often imported from China or Europe due to lack of local alternatives.
- Absence of Standardisation and Performance Guidelines: There are no clear standards, benchmarks, or guidelines for BIPV performance, quality, and installation, causing hesitation among developers. Eg: Without defined safety and efficiency norms, urban local bodies may delay approvals or avoid BIPV in building plans.
What measures can India take to scale up the uptake of BIPVs effectively? (Way forward)
- Introduce Targeted Policy Incentives and Subsidies: India should extend solar subsidy schemes to specifically support BIPV adoption, especially in space-constrained urban areas. Eg: Under the PM Surya Ghar Muft Bijli Yojana (2024), BIPV was included with subsidies up to ₹78,000 for a 3-kW residential system. Similar support is needed for commercial and industrial sectors.
- Embed BIPV in Building and Energy Codes: Integrating BIPV requirements into the National Building Code, Energy Conservation Building Code, and Eco Niwas Samhita can make its use more widespread and standardized. Eg: Europe’s Energy Performance of Buildings Directive mandates solar use in new constructions and promotes BIPV with clear regulations—India can adopt a similar model.
- Promote Domestic Manufacturing and Demonstration Projects: Boosting indigenous production through PLI schemes, along with pilot projects in public infrastructure (e.g., schools, airports), can improve visibility and reduce costs. Eg: The CtrlS Datacenters in Navi Mumbai and Kolkata’s Renewable Energy Museum show how BIPV can be scaled in real-world infrastructure.
Mains PYQ:
[UPSC 2020] India has immense potential of solar energy though there are regional variations in its development. Elaborate.
Linkage: Building-Integrated Photovoltaics (BIPV) is a key solution for boosting solar adoption, especially in densely populated urban areas where traditional rooftop solar (RTS) is constrained by limited shadow-free space. BIPV transforms entire buildings into power generators by integrating solar elements directly into architectural elements, using available surfaces more efficiently and contributing significantly to India’s solar capacity goals.
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