Solar Cooking
Last edited: 26 June 2020      

Solar Bowl on the roof.

Auroville Solar Bowl 2.jpg
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Auroville Solar Kitchen staff.jpg

The Auroville Solar Kitchen is a collective kitchen for the Auroville community and was finalized in December 1997. Auroville (City of Dawn) is an "experimental" township in the Viluppuram district, in Tamil Nadu, India, near Puducherry in South India.

It serves lunch daily in its dining hall, and sends lunches out to schools and to individuals as well. It derives its name from the large Auroville Solar Bowl on its roof, which provides the steam for cooking on all the sunny days of the year. Back-up steam, if needed, is provided by a diesel-fired boiler.

Throughout the year approximately 1000 lunches are prepared daily. Approximately 540 go to the schools, 200 go out by tiffins, which are interlocking cylindrical stainless steel containers, and 260 to 300 are consumed in the dining hall. Since October 2006, dinner is served Monday-Saturday between 6:00 and 7:30 PM.

The Kitchen asks anyone intending to eat there to book in advance. It's possible to arrive unannounced without a booking, but you have to wait until 1:00 PM when un-booked diners are welcome.


Schematic workings of the Solar Bowl.

As part of the research being done in Auroville in the mid-nineties, a large concentrating solar collector known as the Auroville Solar Bowl began construction under the direction of John Harper. The Scheffler Community Kitchen concentrator focuses the light to create steam, which is used in the kitchen for cooking. The innovative decision to integrate a fixed spherical solar bowl concentrator with a 15 meter diameter into the building determined, to a large extent, the design and technology applications used within the building itself. They decided upon a solar bowl with a single concave mirror for the stability it offered (as opposed to separate parabolic reflectors) because of the strong winds that prevail during the monsoon.

One problem that arose when they built first model at the Centre Guest House was devising a system to track the sun. According to Harper "Now, because of our experience in putting together the Matrimandir heliostat to supply a steady beam of light into the chamber, we have the knowledge to handle this technical aspect. To me, building this bowl has been one step towards the future. With this bowl we will be producing steam for cooking, but eventually the heat that you trap could be used for a variety of purposes such as pumping water, producing mechanical power, industrial process heating, etc. One can envision the whole of our Industrial Zone running on solar energy.. It is a question of orientation. Walk across an open field on a bright sunny day - you can feel yourself being roasted and scorched by the burning sun, or you can feel a great joy in the perception that you are being bathed in a powerful flood of rich golden energy!"

The collector is positioned at the western end of the first floor,, composite granite blocks were used for the foundations, and walls of compressed earth blocks support the whole structure. A total of 96 prefabricated ferrocement elements were cast and hoisted in place to form a perfect fixed spherical bowl. A tilted fixed mast supports a moving receiver which can rotate in all directions around a double-axis articulation placed at the centre of the sphere and balanced by a counterweight. A computer program ensures the automatic tracking of the whole system with scope for seasonal changes. The solar bowl is hybridized with a conventional diesel fired boiler back-up system for cooking on an off-on basis. The interface is through a heat storage tank using thermic fluid storage (1.4 m3) with one-hour heat storage capacity. Possible future replicability for community cooking, power generation, desalinization and cold storage have been kept in mind.

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Auroville Solar Kitchen
Puducherry, Tamil Nadu