Switched-On Solar is a division of Thermaire Investments (Pty) Ltd, a company that has been in existence since 1945. 


We aim to be a leading renewable energy partner across the commercial and farming sectors in Africa, by providing affordable, reliable and innovative solutions to address the growing demand for reliable electricity. Headed by solar engineer Luigi Ferro, our installations are supported by a highly skilled technical team – no project is too big or too small for us!


Why partner with us?

Backed by a professional service history dating back to 1945 and a proven record of success, Switched-On Solar offers a professional service based on:

  • The latest solar energy technology available globally
  • Extensive technical experience
  • Extensive knowledge across all industries
  • Unique patented designs

We have local and international project experience

We have successfully completed installations in Gansu Province Zhangye City Desert, China; Shanghai city Zhangjiang HI-Tech Park, China; Hangzhou Energy Environment Industrial Park, China; Ductshop, Johannesburg, South Africa and Viking Air Conditioning, Johannesburg, South Africa.

For more information visit our   Projects Area



Reliable, clean electricity 

There is no denying that the initial installation of a solar power system can be expensive, however the long term savings on electricity yield a substantial return, not to mention the convenience factor of never being without electricity and the positive impact on the environment.

Through the use of a needs assessment, Switched-On Solar has the ability to offer the most cost effective solar power solution to suit your budget. Our payback periods are estimated between 3 to 4 years which translates into a 20% return per annum. The estimated life span of a solar plant is atleast 25 years.

South African Revenue Service (SARS) has made an allowance that can assist in putting money back into your business. From 1 January 2016 companies can depreciate the cost of the solar system and all associated parts by 100% in the first year if the system produces less than 1MW.  Any foundation or supporting structure that is critical to the operation of the solar system will also be included in the depreciation.


Luigi Ferro

 Luigi Ferro

Lead Switched-On Solar Engineer, Luigi Ferro, has numerous years of both local and international project experience within the solar energy market. With an inherent passion for technology and with a focus on continuous advancement for the betterment of the industry – Luigi's expertise, knowledge and experience are unsurpassed.

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Some of our suppliers include:

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