Assemblin in agreement to acquire Tom Allen Senera – a leader within integrated energy solutions in Finland

Assemblin continues to lead the transformation to sustainable decarbonised building solutions with the acquisition of Tom Allen Senera (TAS), Finland’s largest installer of energy solutions with an annual turnover of approx. 30 MEUR and over 90 dedicated employees.


TAS is the leading integrator of energy solution combining geothermal, heat exchangers, cooling and other energy systems to provide sustainable and intelligent solutions. The broad customer base includes retail, residential, commercial, office and single-family homes across Finland.

“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 decarbonisation”, says Mats Johansson, CEO Assemblin Group.

“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.

The completion of the transaction is conditional on authority approvals.

For more information about TAS please refer to

For more information, contact:

Mats Johansson, CEO Assemblin,, +46 10 475 39 60

Åsvor Brynnel, Communications and Sustainability director Assemblin,, +46 10 475 39 48

Johan Holma, CEO TAS,, +358 44 7006 773

About Assemblin

Assemblin is an end-to-end installation and service partner with operations in Sweden, Norway and Finland. We design, install and maintain technical systems for air, water and energy. Our vision is to create smart and sustainable installations that make buildings work and people feel comfortable. We do this through close local collaboration supported by a strong organisation. We have annual sales of approximately SEK 10 billion and 5,900 dedicated employees at more than 100 locations in the Nordic region. Read more at