Solar Thermal Energy Performs in the Scandinavian north – TSF Brings Out the Best in Abora Technology

Can solar thermal energy operate efficiently at northern latitudes? Real-world results from Finland show that it can. Abora’s solar thermal collectors, when combined with Thermal Storage Finland’s hybrid thermal power plant technology, have proven capable of producing renewable heat reliably even during the winter season and achieving momentary energy self-sufficiency as early as late winter. These results provide a strong example of how, when utilized correctly, solar thermal energy can function effectively even in demanding climatic conditions.

TSF’s hybrid thermal power plant makes use of heat from solar collectors even at low operating temperatures, enhancing heat production throughout the year. Bright but cold late-winter days are especially favorable for the system, as solar irradiance is high and heating demand remains substantial. For instance, in January, when the outdoor temperature was –5°C, the fluid returning from the collectors was measured around 23°C. This demonstrates that solar energy can be effectively harnessed even in the coldest parts of the year. “Together with Thermal Storage Finland, we believe we can help solve the emissions challenge across the EU,” describes the CEO of Abora Alejandro del Amo.

In March 2025, a 12,300-square-meter commercial building in Finland reached momentary full energy self-sufficiency in heating. All heat demand and the system’s internal electricity consumption were covered by hybrid solar thermal collectors without the need for external electricity power. At times, the system even generated surplus electricity. “We expected this level of self-sufficiency to be achieved in summer, but the March results exceeded all expectations,” says TSF’s Commercial Director Jusu Kainulainen.

The system now provides the property’s entire annual heating needs with zero carbon emissions at an average cost of 25 to 35 euros per megawatt-hour, without any upfront investment. The solution has already proven more cost-effective than district heating.

The solution implemented by TSF demonstrates that solar thermal energy can be transformed into a reliable and efficient heating method even in harsh climate zones. The results achieved in Finland provide clear, measurable evidence of the system’s performance. “Finland may not be a primary market for solar thermal, but that is precisely why success here reinforces the credibility of the concept elsewhere,” comments CEO of Thermal Storage Finland Janne Ritakoski. TSF’s concept is adaptable to different applications and compatible with multiple heat sources. It is scalable, fast to deploy, and easy to manage, making it a strong candidate for international use in the transition to sustainable heating.