4 Companies, One Mission: Affordable and reliable heat and cold supply for industry and utilities.




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Operating more than 15 solar thermal installations across the world.
Over 0 kWh
The amount of clean energy we sold globally.



Our group of companies own and operate approximately 15 solar thermal installations across Europe, Asia and the United States. Key reference projects include large-scale solar integration into district heating systems in Graz, Austria, solar cooling systems at Desert Mountain High School in Arizona, and solar heat supply for industrial clients such as AVL. Additional projects include municipal infrastructure and regional district heating networks in Austria.
These installations demonstrate the technical reliability and economic viability of solar thermal energy across a wide range of applications and climatic conditions.
Over 30 Years of Experience in Renewable Energy Infrastructure.

The companies of the solarnahwaerme.at group, acting under SOLID Asia Energy Services Pte. Ltd and SOLID DMHS Inc, in Asia and US, represent more than 30 years of experience in renewable energy infrastructure. Founded and led by Christian Holter and Franz Radovic, the group focuses on the development and operation of solar thermal energy systems in Europe, North America, and Asia.
Christian Holter is also co-founder and founding managing director of the Austrian renewable heat network nahwaerme.at, which includes 38 partner companies operating more than 70 district heating plants.
This background combines entrepreneurial experience with proven expertise in developing and operating large-scale renewable heat infrastructure.


