Photovoltaic windows: glass that generates electricity in 2026

Imagine windows that generate electricity while letting you see out. Not sci-fi: in 2026 there are commercial products in the market. Called BIPV (Building Integrated Photovoltaics).

How they work

Three main technologies: 1) CIGS thin-film cells between two glass panes (20-30% transparency). 2) Organic cells (40-70% transparency but low efficiency). 3) Semi-transparent perovskite cells (most promising, adjustable transparency, 13-15% efficiency).

Real production

Conventional opaque solar panel: 150 W/sqm. Semi-transparent BIPV window: 30-50 W/sqm (3-5× less). But occupies surface you already have (building facade) without needing additional roof. Covers 5-15% of building consumption based on orientation.

Commercial brands 2026

Onyx Solar (Spain): world leader, BIPV facades at Apple Park, Stade de France. Polysolar (UK): greenhouse specialist. Heliatek (Germany): thin film applicable as vinyl. Ubiquitous Energy (USA): clear to eye, opaque to infrared.

Current cost

BIPV window 1 sqm: $1000-3000. Conventional window: $200-500. Premium $700-2500/sqm. Energy payback: 12-18 years. High. Only justifies premium architecture or when client pays for aesthetic factor.

Real applications already in production

Apple Park (California): solar panels as skylights. Stade de France (2024 renovation): BIPV facade. Endesa Madrid building: 200 sqm BIPV facade. Cochin Airport (India): first 100% solar airport terminal (including glass).

Future: 2027-2030

Transparent perovskite will drop cost 60% in 5 years. Commercial efficiency will rise to 18-20%. By 2030 any new office building expected to have at least south-facing BIPV facade. Residential remains niche.

Compare with solar roads.