LPG prices keep rising. Firewood causes respiratory illness. Induction needs grid electricity. Green Filament's patent-granted solar cooking system offers a battery-free alternative — powered entirely by sunlight.
Cooking is one of humanity's most fundamental activities. Yet in 2026, hundreds of millions of Indian families still cook on LPG that costs ₹900 to ₹1,200 per cylinder, or on firewood that fills their lungs with toxic smoke. The clean cooking challenge is one of the most important — and most overlooked — energy problems of our time. Solar cooking may be the most practical answer yet.
The Problem with How India Cooks Today
India's cooking energy mix is a combination of LPG, firewood, crop residue, and coal — each with its own significant problems. LPG is expensive and dependent on supply chains. Firewood and biomass cause indoor air pollution responsible for over 4 million deaths globally every year. Even induction cooking, while clean, requires reliable grid electricity that is unavailable in large parts of rural India.
- LPG costs families ₹800 to ₹1,200 per month — 10 to 15% of household income
- Firewood smoke causes respiratory illness, especially in women and children
- 4 million deaths per year linked to indoor air pollution from cooking
- Induction cooking requires stable grid electricity — unavailable in remote areas
- No single clean cooking solution has been affordable and accessible at scale
Why Solar Cooking Has Struggled — Until Now
Traditional solar cookers — parabolic dish concentrators and box cookers — have been around for decades. They work, but they have serious practical limitations. They require direct sunlight and constant adjustment, cannot cook inside, and are impractical for everyday use. The result is that solar cooking has remained a niche technology despite enormous potential. What was missing was a practical, direct-current solar cooking system that works like a conventional stove.
Green Filament's Patent-Granted Solar Cooking System
Green Filament has developed and received a patent grant for a solar-powered cooking system that works fundamentally differently from traditional solar cookers. Instead of concentrating sunlight directly, it uses solar panels to generate DC electricity which powers a high-efficiency coil heater — similar to an induction stove, but running on direct solar power without any battery storage.
Battery-Free — Why It Matters
Most solar appliances rely on batteries to store energy for use when the sun is not shining. Batteries add cost, require maintenance, and eventually need replacement. Green Filament's solar cooking system eliminates the battery entirely by designing the system to cook during daylight hours — which aligns naturally with when most cooking happens. Breakfast in the morning, lunch at midday, early dinner preparation — all during peak solar hours. The result is a dramatically simpler, more affordable, and longer-lasting system.
- No battery means lower cost and zero battery replacement expense
- Simpler system with fewer components — less to maintain or repair
- 3kW system with 6 × 500Wp panels powers a 1500W coil heater
- Compatible with standard cooking pots — no special cookware needed
- Portable and easy to install — no complex infrastructure required
- Designed for up to 15 people — suitable for homes, schools, anganwadis
Where Solar Cooking Makes the Biggest Impact
The communities that benefit most from solar cooking are those currently spending the highest proportion of their income on cooking fuel — rural households, tribal communities, anganwadi centres, and mid-day meal kitchens in schools. In these settings, the economics of solar cooking are compelling. The system pays for itself in fuel savings within a few years and then generates free cooking energy for decades.
- Rural households spending ₹800-1,200/month on LPG
- Anganwadi centres cooking daily meals for 20-50 children
- Schools running mid-day meal programmes
- Tribal communities in areas with no LPG supply chain access
- Community kitchens in ashrams and institutions
The Sustainability Argument
Every solar cooking system installed eliminates several cylinders of LPG per month — reducing fossil fuel consumption and carbon emissions. For families using firewood, the impact is even more direct — less deforestation, less smoke, better health outcomes. As India works toward its renewable energy and climate commitments, clean cooking at scale is an essential piece of the puzzle that has been largely ignored.
The Future Is Already Here
With over 200 installations across India and a granted patent, Green Filament's solar cooking system is not a concept — it is a proven, field-tested technology. The future of clean cooking in rural India does not require waiting for better batteries or cheaper induction stoves. It is here today, powered by the most abundant and free energy source available — the sun.
