Acquired by

Sale of Tom Allen Senera to Triton-owned Assemblin

Assemblin has agreed to acquire Tom Allen Senera, the leading Finnish geothermal and energy recovery system integrator. With the transaction, Assemblin continues to lead the transformation to sustainable decarbonized building solutions.

With a history originating to the early 1990s, Tom Allen Senera is the leading Finnish integrator of complete energy solutions combining geothermal, heat exchangers, cooling and other energy systems to provide sustainable and intelligent solutions. The company serves customers in Finland across various building segments including retail, residential, commercial and office buildings as well as single family homes. Moreover, the company provides maintenance, service and remote monitoring services to its broad clientele. Today, Tom Allen Senera has a turnover of approximately 30 MEUR and more than 90 dedicated employees.

“We are passionate about providing the best energy solutions for our customers and enable the transformation to a more energy efficient and sustainable society. We are excited about the next step in our journey together with Assemblin. I am convinced that we will further accelerate the development of TAS providing more opportunities for our employees and customers”, says Johan Holma, CEO Tom Allen Senera

“We are deeply impressed by Tom Allen Senera’s track record with advanced technical competencies, customer focus and ability to innovate. We are looking forward to working together, supporting our customers in driving real estate energy efficiency and decarbonization”, says Mats Johansson, CEO Assemblin Group.

The completion of the transaction is conditional on authority approvals.

Carner Corporate Finance advised the owners of Tom Allen Senera throughout the international auction process.



Owned by Triton, Assemblin is an end-to-end installation and service partner with operations in Sweden, Norway and Finland. Assemblin designs, installs and maintains technical systems in areas including electricity, heating, sanitation, ventilation and automation. Over the years, Assemblin has developed and grown by acquiring a number of companies in the Nordic countries. Assemblin employs approximately 5,900 persons and has an annual turnover of c. 10 BSEK.