Striving to be the most dependable, innovative and preferred solar energy solutions provider in Sri Lanka with strong focus on excellent service, genuine products with guarantee and concern for sustainability of natural environment, that we believe can be attained through natural energy production.

Oldest solar company in Sri Lanka in operation since 1982

SolarTherm is the pioneer in the solar industry and the oldest solar company in continuous business in Sri Lanka.

First company in the country to recognize the value of sun’s free energy

SolarTherm in collaboration with the National Engineering Research and Development Centre of Sri Lanka (NERD) developed the first solar water heater in Sri Lanka in 1982. SolarTherm obtained pioneering status for solar water heating systems in Sri Lanka in 1991. SolarTherm was rewarded by energy globe country award twice for their projects in Sri Lanka at the award ceremonies held in the European Parliament

Market Leader in the Solar Industry in Sri Lanka

SolarTherm built the largest ground mounted privately owned solar park with 2.75 MW capacity. SolarTherm has contributed over 50 MW to the national grid, and largest commercial water heating installation of 18,000 litre capacity in Sri Lanka, SolarTherm is undoubtedly No.1 in the industry.


SolarTherm is one of the first companies in the country to recognise the value of the sun’s free energy.

In 1982 having recognised the value of harnessing the power of the sun, Alpha Engineering Services collaborated with the National Engineering Research and Development Centre of Sri Lanka (NERD) to develop a solar water heating system that would play a pivotal role in the area of energy conservation in Sri Lanka. The success of this venture resulted in the birth of Alpha Engineering Services’ brand, SolarTherm.

Having been awarded the national honour in ‘Pioneering Industry Status’, by the Government of Sri Lanka the management, renamed the company to Alpha Thermal Systems (Private) Limited, in order to explore the potential in alternative and economical energy resources. From modest beginnings, Alpha Thermal began to introduce new standards of efficiency and quality control to the local solar energy industry.

The company’s dedication to continuous research, development and innovation has led to the existing leadership status of SolarTherm in the local solar energy market.

SolarTherm has become a 100% solar energy solution provider, helping the company diversify into many other energy conserving processes.

In 2003, Alpha Thermal Systems (Private) Limited, created a sister company, Alpha Solar Energy Systems (Private) Limited, to increase focus and improve customisation of its solar photovoltaic (PV) activities.

The company sources raw material from leading manufacturers worldwide, which facilitates a high quality guarantee for its products. Solar-Therm also has a well-trained, highly motivated team of individuals who subscribe to the company’s core values of customer focus, a dedication to quality, attention to detail, high service standards, and continuous improvement in the business. This dedication has been recognised with numerous awards and quality certifications for their expertise.

Over the years, the company has been a proud partner of micro-finance institutions and non-governmental organisations in Sri Lanka, helping to ease the demand on the hydroelectric grid and providing low-cost energy solutions to low-income segments and rural areas, thereby contributing to the economic development of the country.


REC – REC Group (REC) is a leading European brand of solar panels and a vertically integrated solar energy company. REC was founded in Norway in 1996 and has since come a long way; from hand-washing its first wafer to producing a cumulative total of 26 million panels in its history at end-2016. REC is headquartered in Norway, with operational headquarters in Singapore.

Fronius – Fronius was founded in 1945 and has been continued to thrive on its passion for new technologies, intensive research and revolutionary solutions. As a technology leader, the company finds, develops and implements innovative methods to monitor and control energy for photovoltaics and battery charging. Fronius online system monitoring provides data communication solutions for PV systems, ensuring reliable system monitoring and straightforward integration into other systems. The hardware is quick to install and the software easy to use. SolarTherm is the authorised service partner for Fronius Inverters in Sri Lanka with Service Partner PLUS certified.

SMA – SMA Inverters are made in Germany an suitable for all module types including grid-connections, small house systems and commercial systems in the Megawatt range and even for utility-scale PV power plants up to the multi megawatt range. Designed for optimum performance and maximum yields, SMA inverters are an economical solution for shade mitigation and the challenges of complex roofs. Moreover, it comes complete with grid-management capabilities, ensuring a utility-compliant solution for customers operating in any market.

Soorya Bala Sangramaya (Battle for Solar Energy) – The Ministry of Power and Renewable Energy in collaboration with the Sri Lanka Sustainable Energy Authority, Ceylon Electricity Board and Lanka Electricity Company launched the Soorya Bala Sangramaya in 2016, with the intention of promoting and setting up small-scale solar power plants on rooftops of households, religious places, hotels, commercial establishments and industries, it is expected to add 200 MW of solar electricity to the national grid by 2020 and 1000 MW by 2025. The programme accommodates three options for consumers to generate and use electricity in their households: Net Metering, Net Accounting and Net Plus.