‍Bonnierhuset, a 61-meter-high high-rise building in central Stockholm, holds historical significance as the first concrete scraper built after World War II. Originally designed as an office and printing house, the building continues to evolve with the times, now embracing sustainable energy solutions.

Energy Consumption Reduction
CO2 reductions
Capital Expenditure
Savings on operating expenses
Payback period

Client: Bonnier Fastigheter AB

Building: Bonnierhuset

Location: Stockholm, Sweden

Floor area: 51,000 m2

Project type: Turnkey BTES (Borehole Thermal Energy Storage)-based integrated energy system

Energy system delivery, Heating: 4,700 MWh/year (92% of demand)

Energy system delivery, Cooling: 1,900 MWh/year of cooling (100% of demand)

Electricity consumption: 1,176 MWh/year

Annual reduction of CO2-e emissions: > 75%

Bonnier Fastigheter AB is taking a significant step toward sustainability and environmental responsibility through a transformative green energy project at its headquarters, Bonnierhuset, a 51,000 sq m office complex in central Stockholm.

Previously, Bonnierhuset obtained all of its heating and cooling through district energy providers. Upon completion of its new integrated energy system by Energy Machines, the 74-year-old building will obtain 92% of its heating and 100% of its cooling from renewable energy generated on site.

The integrated system will have a capacity of 1.3 MW for heating and 1.5 MW for cooling, utilizing 27,520 meters of geothermal boreholes located beneath the building's basement car park. Thermal energy will be moved between the building and boreholes via four Energy Machines heat pumps, enabling heat and cold to be seasonally stored and reused throughout the year.

Uniquely, and for the first time in history, an electric-powered air compressor is being used to drill the required 86 boreholes. This new-to-the-market Atlas Copco air compressor provided by Team Wessman AB replaces traditional diesel-powered alternatives, reducing noise and eliminating the burning of approximately 90m³ of diesel and extending the environmental benefits of the system even further.

"Our vision is to be a sustainable urban developer. At Bonnier Fastigheter, we are excited to embark on this project, which represents a green transformation of the Bonnierhuset. We firmly believe in value creation and sustainable energy solutions, and we find it truly remarkable to make this project environmentally friendly throughout the entire chain. This project is part of our decarbonization plan," said Mook Changrachang, Energy Strategist, Bonnier Fastigheter.

The integrated system will deliver 4,700 MWh/year of heat and domestic hot water and 1,900 MWh/year of cooling. When operating at peak power (e.g., on the coldest day of the year), the system uses up to 294 kW of electricity. Its annual total electricity consumption amounts to 1,176 MWh. This results in a significant reduction of the building’s yearly CO2 emissions by more than 75%.

Anticipated to be fully commissioned around November 2024, the Bonnierhuset project provides a tangible example of how implementing low-carbon energy technologies into the current building stock can make a real impact for the green transition.

“We're thrilled to extend our collaboration with Bonnier Fastigheter on another exciting project in one of Stockholm's landmark buildings. Bonnier Fastigheter's stringent sustainability standards and the project's unique technology attributes present a challenge align seamlessly with Energy Machines’ expertise in transforming buildings into energy machines that generate, store, and reuse their own energy. We look forward to adapting Bonnierhuset’s energy operations for a greener future,” said Karl Brag, Stockholm Regional Manager, Energy Machines.

Bonnierhuset car park site for geothermal boreholes (prior to drilling)

Atlas Copco air compressor from Team Wessman AB arrives for borehole drilling in the car park

Electric-powered borehole drilling in progress

Pipe manifold facilitating the distribution of geothermal energy between the boreholes and heat pumps. The black pipes will be covered with concrete, restoring the floor to its original state as an operational parking garage.

Energy system components

Digital twin simulations: EM Simulate

Design: EM Modular Design

Geothermal storage: BTES (borehole thermal energy storage) with 86 x 320m boreholes

Borehole location: Building car park, Floor 1

Heat pumps: 4 x Energy Machines EMA/EMB series with low GWP (global warming potential) <10 and ventilated enclosure

System controls: EM Control

SCADA platform: EM Cloud, accessible from the cloud


Turnkey energy system design, implementation, and operation: Energy Machines AB

Borehole drilling: Team Wessman AB

Air compressor: Atlas Copco

Piping: KE Rörinstallationer i Norrköping AB

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Technologies used

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