Solar Cooking
Last edited: 24 October 2022      
Ruivo 01

Professor Ruivo baking solar carob cake baked for the Sacramento solar cooking convention in his non-portable solar funnel concrete cooker.

Celestino Ruivo November 2007
Celestino Ruivo July 2014

After my participation in the Solar Cookers and Food Processing International Conference (2006), I became "well contaminated with the virus of solar cooking." Before I did not use solar cookers, I was a little skeptical. During the last year I have tried to disseminate solar cooking, first in my region (at home, schools, restaurants, beaches, media) but also in other regions and in other countries (Brazil and Spain). My participation at the Granada conference (2006) was the needed ignition to start. I have started with the solar CooKit that was given to me. Then a lot of experiences were done with different types of solar cookers, most of them of low-cost apparatus using recycled materials. During the solar cooking season 90 percent of my meals are cooked on solar cookers. It was very intense and enthusiastic activity, and there were some things that did not run well. I'm very tired but I will try to "contaminate" others with "this solar cooking virus" next year. It is not easy. Many thanks for all of the speakers at the Granada conference and especially for Pedro Serrano.


  • January 2020: Prof. Ruivo organizes the CONSOLFOOD 2020 solar cooking conference.
  • January 2018: Prof. Ruivo organizes the CONSOLFOOD 2018 solar cooking conference.
Technical University Federico Santa Maria, Ruivo, 10-19-13

Technical University Federico Santa Maria students with Celestino Ruivo and Pedro Serrano

  • October 2013: Celestino Ruivo, Doctor of the University of Coimbra's academic and University of Algarve, Portugal, visited the Technical University Federico Santa Maria in Chile, invited by the Academic Department of Architecture, Pedro Serrano. Both belong to international solar cooking organizations. Dr. Ruivo has been developing new lightweight and portable solar cookers, and spent time with students to discuss innovation. Later they traveled to Villaseca to visit Delicias del Sol, the popular local solar restaurant. More information... -
  • September 2013: In July, Australian solar cooking enthusiasts in Brisbane, Queensland, hosted Portuguese solar cooking authority Professor Celestino Ruivo. A winter solar cookout — possibly the biggest gathering of solar cooking ever in Australia — was held at the home of Stan and Jane Cajdler and was attended by more than 70 enthusiasts with 25 solar cookers. Prof. Ruivo demonstrated his Celestino Solar Funnel Cooker.
  • February 2013: Solar cooking and processing workshops in India - Celestino Ruivo traveled to India at the end of January to attend the 1st International Solar Food Processing Network workshop at the Muni Seva Ashram in Goraj, Vadodara, Gujarat, India. He brought with him 50 kg of solar cooking baggage: 8 black pots, 16 glasses of windows cloth washing machines, corrugated sheet metal, reflective foil and tools to make low-cost and effective portable funnel cookers. Creatively, Celestino used his suitcase as the mold to construct examples of his solar funnel cooker in concrete. He also gave a lecture about solar cooking and how to construct a funnel cooker at the CT institute in Punjab for more than 300 students, as well teaching solar cooking for ladies in domestic context at Jalandhar. The eight funnel cookers were donated to friends in Hyderabad, Mumbai, Muni Seva Ashram, Vadodara, Jalandhar and New Delhi.
Manik Panel Cooker

Celestino Solar Funnel Cooker


Celestino Ruivo's innovative cement-based solar cooker.

  • January 2013: The original funnel solar panel cooker was inspired by the CooKit. This efficient solar panel cooker was developed in 2007 using sheets of polypropylene. Recycled windows of clothes washing machines were used to create the greenhouse effect around the pot. A variation of the cooker made of concrete and common mirrors has been tested since 2009. Some of the main advantages of this solar cooker are low-cost reproduction in every part of the world using locally available common materials, intuitive and practical use, water/rain-resistance and wind-resistance, and no risk for fire ignition. The useful heating capacity of this model was estimated around a value of 100 Watts. Read more at Experiences of solar cooking in Portugal during the last six years
Portugal august 2008 cookit

Professor Celestino Rodrigues Ruivo

  • August 2008: Since becoming “well contaminated with the virus of solar cooking” at the 2006 Solar Cookers and Food Processing International Conference in Spain, professor Celestino Rodrigues Ruivo has become an important advocate for solar cooking in Portugal and beyond. Ruivo credits Pedro Serrano of Chile’s Red Iberoamericana de Cocinas Solares (RECOSOL) and others for helping him overcome his initial skepticism. Ruivo learned to solar cook using a CooKit given to him by Solar Cookers International (SCI). He has since made and used several types of solar cookers, mostly “low cost apparatus using recycled materials.” Over ninety percent of his meals are now cooked with solar energy. Ruivo started promoting solar cookers locally — at his home, in local schools and restaurants, etc. — and worked with local media. Then he broadened his scope to other regions of Portugal, and eventually to Brazil and Spain. He’s even becoming known in Australia, where an interview with Ruivo (taped during a solar cooker workshop he conducted for about 70 Scouts) was broadcast on Australia’s SBS television program “Dateline.” Ruivo conducts numerous promotional activities. He has held several solar cooker conferences at the University of Algarve, with sessions on the evolution of solar cookers in Portugal, solar cooker distribution strategies, and solar cooker construction. He has also assisted with solar picnics and participated in solar cooking contests. According to Serrano, Ruivo has “developed an intensive process to diffuse the technology, [organizing] workshops, symposiums, courses, etc. — more than 20 activities in only one year.” Though Ruivo admits to being somewhat tired, he says he will continue his efforts to “contaminate others with this solar cooking virus.”

Articles in the media[]


Audio and video[]

  • October 2022:

    Mirta y Virginia, pasión por las cocinas solares.-2

    Mirta and Virginia, passion for solar cookers, Switch to English, or other, subtitles

  • January 2021:
  • March 2017: 

USP Encontro de Cozinha Solar


USP - Encontro de Cozinha Solar

No dia 21 de setembro 2015, um encontro na Escola Politécnica (Poli) da USP mostrou que é possível cozinhar sem eletricidade, gás ou lenha. Materiais acessíveis como papelão e alumínio são suficientes para construir um forno solar simples capaz de assar bolos e preparar refeições. Além de vantagens sociais e ambientais, a cozinha solar ainda proporciona uma comida saborosa e nutritiva. Produzido por: Aline Naoe, Pedro Bolle, Luiza Caires e Valéria Dias

  • June 13, 2014: Uma caldeirada cozinhada com luz solar - Um hotel de luxo em Vilamoura, no Algarve, decidiu demonstrar as potencialidades da energia solar na área da cozinha. No jardim do hotel, os turistas foram surpreendidos com uma caldeirada de peixe confecionada apenas com recurso à energia solar. Veja o video - TVI 24
  • Castanha_em_forno_solar

    Castanha em forno solar

    Castanha em forno solar

See also[]

External links[]


Prof. Celestino Rodrigues Ruivo
Instituto Superior de Engenharia da Universidade do Algarve
Campus da Penha
8005-139 Faro

Tel: 289800166/289800100 (ext. 6571)
Fx: 289888405