Hi, we are now Gren.

About us

  • An absolute pleasure to meet! We are Gren, your new energy company.

  • Gren – the Northern European green energy company. All new, but positively familiar.

    In Gren experiences meet future-minded initiatives. This is where we switch off all the excuses, and action on. This is where the future is being energized today in a sustainable and efficient way.

  • Our ambition is to enable – the customers, businesses, cities and partners alike – to thrive, whatever you might be up to. Because you, your needs and goals are what really matter.

    Gren is here to deliver comfort. To people, businesses, municipalities.

  • We are currently developing and improving the new company. We will tell you more about our company’s strategy, values ​​and activities very soon.

    Stay tuned and follow the news on our website!

Our activities

  • We serve our customers

    We are here to serve our customers – the residents and businesses within our cities– with green and reliable energy solutions that make their lives comfortable and carefree throughout the seasons. We offer modern and professional heating and cooling solutions – separately or in one package. We operate district heating networks, and service individual heat substations for housing associations, individual houses and business customers. We produce electricity that we sell directly to large industrial customers and to the grid.

  • We produce energy

    We produce energy – electricity, heating and cooling from local, renewable and CO2-free resources. We know that waste does not belong in landfills and is a valuable resource that can be turned into energy at the end of products’ life cycle, supporting the circular economy. With care for the environment and the planet, we know how to use natural resources to make your life comfortable and easy. We feel responsible for sharing what we do best and for contributing to societies and the planet’s benefit and well-being.

  • We offer

    We are flexible in our offers to serve the needs of our customers best. We are determined to widen our services and to grow even greener together with our customers. If you are interested, just let us know – we will create a tailor-made energy solution for all your needs.

  • District heating

    District heating is the safest and most environmentally friendly heating solution for cities and densely populated areas. It secures efficient use of fuels and significantly improves air quality in cities by reducing emissions of fine particles and dust into the air. District heating is a very convenient solution for customers with minimal maintenance costs, low initial investments for connection and with a professional customer service that allows to forget about regular maintenance of heating equipment and fuel supply.

  • District cooling

    As district heating, district cooling fits perfectly to cities and densely populated areas. Cooling can be produced in a very efficient way (e.g. we can use river’s water as a natural cooling source). The cooled water is distributed via networks to a customers’ cooling unit, where it circulates in the building to provide a comfortable and healthy indoor climate. Connecting a property to the network frees up large amounts of space and helps to achieve carbon neutrality to property owners.

  • Electricity

    Electricity is an essential part of our daily comfort and is widely used both by households and by different industries. Nowadays, with the wider use of modern technologies, the role of electricity has even increased. Moreover, electricity production plays an important role if we talk about lessening the climate change and the environmental footprint. The more renewables and other CO2-free resources are used for electricity production, the greener and better it is for people, societies and the planet.

Our locations

    • In Estonia we focus on developing sustainable energy solutions to meet the needs of local communities and to provide comfort for their daily lives.

    • We serve our customers in Tartu and Pärnu – industrial businesses, housing associations, and individual houses – with clean, reliable and comfortable district heating produced in our biomass combined heat power plants from local and renewable energy. If needed, heat can also be provided by traditional heat only boiler (HOB) plants (biomass and gas-fired) as well as by excess heat from industry (e.g. printing house in Tartu).

    • District cooling is the latest addition to our energy production in Estonia. We opened the first river-based district cooling plant in the Baltic region in Tartu. In Tartu, district heating and cooling networks are connected via heat pumps, forming an integrated energy system which received international recognition in 2017 when it won the Global District Energy Climate Award in the Expansion category.

    • Biomass combined heat and power plant in Pärnu

      Our biomass combined heat and power plant in Pärnu utilizes local biofuels to provide district heating to approx 890 customers and 19 000 end users. Electricity produced is sold to NordPool  and to some large industrial customers.

      From the beginning of 2018 new products have been launched to industrial customers nearby the Pärnu plant. We are supplying customers with steam and electricity via a direct line.

    • Biomass combined heat and power plant in Tartu

      Our biomass combined heat and power plant in Tartu utilizes local fuels – woodchips and milled peat, whereby a large part of the peat comes from the company’s own peat deposits. The plant provides district heating to approx 1 900 customers and 72 000 end users in Tartu city.

      The Tartu plant is the backbone for Tartu district heating and cooling system that is one of the best and most advanced in Estonia.

    • Downtown district cooling plant in Pärnu

      The most recent district cooling plant was completed in June 2019 in Pärnu.

      The plant uses Pärnu river water as a natural cooling source and has the capacity to connect all downtown public buildings to the its network. The first to join our network in Pärnu was Pärnu Keskus shopping center.

    • Downtown district cooling plant in Tartu

      Our environmentally friendly and high efficiency district cooling plant in Tartu, is located by the Emajõgi river and uses the river’s cool water as natural cooling resource.

      In 2015, we connected the first customer to the network – the Kvartal shopping center in the heart of Tartu.

    • Aardla district cooling plant in Tartu

      Aardla district cooling plant was completed in June 2017.

      The plants initial capacity has been calculated by taking into account the needs of the current main customer’s largest shopping and leisure center in Southern Estonia, Lõunakeskus, and the buildings in its vicinity.

    • In Latvia we operate in Jelgava and in Daugavpils, where we focus on renewables and on local resources in energy production to to support the needs of our customers and local communities while having a positive impact on the environment.

      In Jelgava, we are a district heating operator and serve our customers – households, public buildings, businesses – with sustainable, reliable and comfortable district heating  produced from local, renewable resources. The balance of renewables in heat production in Jelgava is 92%.

      In Daugavpils, we provide heat to the city’s district heating operator, securing around 40 % of the heat energy necessary for the city.

    • Our electricity production is mainly from renewables – biomass and wind, and a small portion  from natural gas. Electricity is sold at NordPool and to some large industrial customers.

    Biomass combined heat and power plant in Jelgava

    Our combined heat and power (CHP) plant in Jelgava is using local renewable energy resources, primarily wood chips, to provide district heating (DH) to  approximately 16 000 households and 173 B2B customers – schools, public buildings, businesses in Jelgava.

    Jelgava CHP plant is the largest biomass CHP plant in Latvia. It has improved the overall efficiency and security of  DH and has reduced the CO2 emissions from heat production by 90% compared to 2010.

    Now we are working on fuel diversification project that implies adding to the biomass 35% refuse derived fuel (RDF). That will decrease the amount of waste going to landfills and will have a  positive impact on heating and waste management prices for Jelgava residents.

      • In Lithuania, we operate in Joniškis, Kaunas, Klaipėda and Švenčionys. Our operations focus on sustainable and clean energy solutions from non-hazardous municipal and industrial waste, safe and efficient district heating, and gas allocation and supply.

      • In Klaipeda and Kaunas we serve our customers – district heating companies of the cities – with heat energy produced  from non-hazardous municipal and industrial waste as well as from biofuels. Our waste-to-energy (WtE) combined heat and power (CHP) plants provide a sustainable solution not only for heating, but also for the waste management in Lithuania by supporting the waste management system and adding efficiency to it. Waste is used wisely for heat and power production instead of increasing the amount of waste in landfields. Electricity produced from waste is sold to NordPool.

      • In Joniškis and Švenčionys we serve our customers – residents and businesses – with efficient and comfortable district heating produced from local biofuels and natural gas.

      • Waste-to-energy  combined heat and power plant in Klaipeda

        Our waste-to-energy (WtE) combined heat and power (CHP) plant in Klaipeda is the first plant of its kind in Lithuania. It uses non-hazardous municipal and industrial waste as well as biofuels to produce heat for the residents and businesses of Klaipeda city. The plant’s boiler can incinerate up to 255 thousand tons of waste and biofuel annually, the energy efficiency of which is almost 90%.

        The modern, clean and effective energy production mode has helped to keep more than 1.5 million tons of waste from being landfilled and polluting the environment. The plant has become a prime example in the energy industry on managing waste and adding efficiency to Lithuania’s waste management system.

      • Waste-to-energy  combined heat and power plant in Kaunas

        Joint waste-to-energy (WtE) combined heat and power (CHP) plant developed together with the largest energy company in Lithuania UAB “Ignitis grupė” is the second WtE CHP plant in Lithuania. The plant uses non-hazardous municipal and industrial waste to produce heat for the residents and businesses of Kaunas city.

        The plant’s waste fuel boiler is capable to incinerate 250 thousand tons of waste annually and is an essential component in the development of the waste management system in Lithuania.  Kaunas CHP plant was built to align with the National Lithuanian Energy Strategy.


      • On December 1, 2021, three highly qualified and experienced professionals are joining Gren: Tomas Tumenas as Chief Financial Officer,  Reena Säästla as Chief Legal Counsel and Tomas Miskunas as Chief Information Officer. 

        Ilkka Niiranen, the CEO of Gren, warmly welcomes the new colleagues to the team: “I am very pleased that Gren team has been joined by highly qualified professionals in their field who are excited and determined to participate in our interesting journey of growth and development into an independent customer-centric residential and industrial energy solutions provider. The journey of new activities in Gren is taking up speed!” 

      • Tomas Tumenas

        Chief Financial Officer

        Tomas Tumenas as Chief Financial Officer (CFO) will be responsible for management of corporate finances, including financial planning, data analysis, financial risk management, accounting and financial reporting.  He will lead the financial and business controllers team of Gren Group.  

        Tomas Tumenas is a very experienced leader with over 20 years of experience as CFO. He joins Gren from CFO position of UAB Limedika. Tomas Tumenas is also an independent board member of EPSO-G.  

      • Reena Säästla

        Chief Legal Counsel

        Reena Säästla as Chief Legal Counsel (CLC) will be responsible for legal affairs of the entire Gren Group. She will lead and develop legal strategy of Gren and will provide direction and support of legal and regulatory issues.  

        Reena Säästla is an experienced legal counsel who has worked in energy business for the last 13 years. Reena joins Gren from Adven Group, where she has been Chief Legal Counsel for the Baltics. Previously she has worked for Eesti Energia.  

      • Tomas Miskunas 

        Chief Information Officer

        Tomas Miskunas as Chief Information Officer will be responsible for ensuring that Gren’s long term strategy is supported by IT/business technology in respect of operational excellence, M&A readiness and cyber security. Tomas Miskunas and business technology team will drive Gren’s IT/business strategy, technology roadmap and development.  

        Tomas Miskunas is highly professional leader experienced on managing complex programs and transformations for major global businesses. He joins Gren from Ignitis Group, where he has been leading IT Development.  


        Tomas Tumenas, Reena Säästla and Tomas Miskunas will be part of Gren Management Team 

      • Works of construction of a unique road section, where slag generated in the process of conversion of non-hazardous waste to energy was used, were recently completed in Jurbarkas district. This is the first project of such kind in Lithuania aimed at studying the road in detail and determining the impact that slag has on road operation. The conducted study and the evaluation of the achieved results will allow to decide on further use of slag on Lithuanian roads.

        9 000 tons of slag which was generated at the UAB Gren Klaipėda waste-to-energy plant and prepared for use was used in the one-kilometre-long test section. The client of the project was SE Lithuanian Road Administration, the contractor – AB Kauno Tiltai, while the Vilnius Gediminas Technical University (VILNIUS TECH) conducted research in the course of road installation and operation.

        The exact location of the experimental section is the regional road of national significance No. 1705 Mikutaičiai I–Vertimai, from 1,8 to 2,8 km, in Jurbarkas district. 5 experimental paving structures were installed in this section. The project has been implemented in two stages. The first stage is the installation of an experimental section and the second stage will be the assessment of the possibility of using slag on the road with the help of installed sensors. The second phase will last till April 2024, but performance results are likely to be available after the first or the second winter.

        “The first attempt in Lithuania to use slag generated during the incineration of non-hazardous waste in the construction of roads is an excellent example of the implementation of principles of circular economy. If this experiment proves successful, we would reap comprehensive benefits – waste amounts would be reduced, leaving the environment cleaner, and we would have recycled raw materials generated in Lithuania for expanding road infrastructure. This would be a new step in the transport sector, opening up wider perspectives for the use of environmentally sustainable materials in road construction”, the Minister of Transport Marius Skuodis said.

        In September, the Ministry of the Environment approved new requirements for the treatment of ash and slag, which allow using slag remaining after waste incineration in road construction, installation of building foundations, covering layers of disposed waste, closing landfills and installation of temporary roads in them.

        The Minister of the Environment Simonas Gentvilas hopes that if the experiment proves successful, it will become possible in the future to use all the secondary raw materials generated in the country, including ash and slag, which will replace granite, which usually is imported into the country. “I invite drivers going through Vertimai village to take note of the road section, which professionals have turned into a road using material that was once our waste. The use of ash and slag creates new value instead of disposing of useful materials in landfills,” says the Minister of the Environment.

        Remigijus Lipkevičius, Director of SE Lithuanian Road Administration, says that having obtained positive research results and determined that proper use of slag generated in waste incineration plants in Lithuania is possible, volumes of disposed slag and its disposal costs could decrease, also leading to a decreased need for new aggregates (gravel, crushed stone) extracted in quarries.

      • According to Vitalijus Žuta, General Director of UAB Gren Lietuva, this is another long-awaited stage of waste utilization. “Since the time when the first waste-to-energy plant started operating in Klaipėda, we have been actively and consistently working to ensure that slag is recognized a useful material, and would be put in use rather than simply disposing of it. During that time, we conducted five long-term studies with various departments of Vilnius Gediminas Technical University and proved that our slag is a reliable and useful material. And this project brought this idea to life,” said Vitalijus Žuta.

        There are currently three waste-to-energy plants operating in Lithuania with a total capacity of 615 000 tons of waste per year. In the process of energy recovery, i.e. incineration, about 20% of this amount comes up in the form of slag. Thus, about 120 000 tons of slag are generated in Lithuania per year. Slag forms in the process of incineration of non-hazardous waste at temperatures as high as 1000°C and is a solid, cellular material.

      • On November 8, 2021 Ilkka Niiranen starts as Chief Executive Officer of Gren, the leading Northern European green energy company. He was appointed on July 8, 2021.

        For the past 10 years Ilkka Niiranen has worked for Adven Group holding various executive positions including Country CEO of Sweden and Norway. Ilkka Niiranen has strong experience in District Heating and Cooling, Power Generation and Industrial Energy Solutions (IES) where he has been responsible for sales and investment projects. He has also worked on M&A, carve-outs and integrations.

        Matti Viljo, Chairman of the Board, warmly welcomes Ilkka Niiranen in Gren: “We are approaching the moment of becoming a fully independent company from the beginning of 2022 and I expect Ilkka to play an instrumental role in developing Gren’s strategy that will be based not only on Gren’s current strong business, but will also include new and exciting growth elements that will  promote Gren’s development into an independent customer-centric residential and industrial energy solutions provider.”

        Ilkka Niiranen, commenting on the start of his new role, says: “I am excited and honored to take on the responsibility to steer the development of this great company. I am very much looking forward to meeting and working together with the highly professional team of Gren. This will be an interesting journey as we will become a truly stand-alone leading Northern European green energy company.”

        Ilkka Niiranen has studied energy markets, strategy and international business in Helsinki University of Technology and he holds degree of Master of Science in Technology.

      • Ilkka Nīranens

      • We are excited to announce that we have entered into new business line oriented on industries, also known as industrial energy solutions (IES). New B2B business line will be lead by our new colleague, Chief Growth Officer, Kevin Vaher.

        ”I am very glad that we have Kevin joining our team. He is very experienced in energy service models and has now the urge to take this service approach to another, a more flexible and customer oriented level”, says Matti Viljo, Chairman of the Board of Gren.

        Kevin Vaher has studied heating and cooling in Tallinn University of Technology and business administration in Estonian Business School. He has experience in both private and public sector, being active in various positions from entrepreneur to manager of engineers union. For the last 10 years Kevin has been focusing on real estate and industry oriented energy solutions.

      • From July 5th 2021, Fortum’s heating & cooling business in the Baltics, recently acquired by Partners Group, a leading global private markets firm, acting on behalf of its clients, relaunches as Gren, the Northern European green energy company. Gren focuses on developing and providing sustainable energy solutions, primarily district heating, using renewables and local resources to meet local communities’ needs and provides comfort for their daily lives while also having a positive impact on the environment.

      • Matti Viljo, Chairman of the Board of Gren, is pleased to introduce Gren. “We are a new brand, and at the same time, our customers, partners and other stakeholders know us very well as our companies have been in the Baltic energy market for several decades. We will continue all our operations and will serve all our customers with the same services and offerings. We are determined to widen the services and to grow even greener together with our customers.” – said Matti Viljo.

      • The relaunch as Gren is the first step in a strategy that seeks to transform the company from a portfolio of attractive district heating assets into an independent customer-centric residential and industrial energy solutions provider. Partners Group will draw on its extensive experience in building out infrastructure platforms to grow the asset through new greenfield projects and targeted strategic acquisitions. Other transformational initiatives will include extending Gren’s heating networks to develop new heating and cooling solutions for industrial and commercial customers.

      • In Estonia, Gren provides clean and reliable district heating produced in biomass combined heat power plants from local and renewable resources to approximately 1’900 customers and 72’000 end-users in Tartu and around 890 customers and 19 000 end-users in Pärnu. Customers in Pärnu and Tartu are also provided with environmentally friendly district cooling produced in modern district cooling plants from rivers’ water. Other Gren’s services in Estonia include steam and direct electricity for industrial customers.

      • In Latvia, Jelgava, Gren provides reliable and sustainable district heating produced in a biomass combined heat and power plant from local renewable resources to approximately 16 000 households and 173 business customers, including schools, public buildings, and businesses, as well as providing services for individual heat substations for housing associations, individual houses, and business customers. In Daugavpils, Gren provides competitive and efficient heat to the city’s district heating operator.

      • In Lithuania, Gren serves the district heating companies of the cities of Klaipeda and Kaunas with sustainable heat energy produced in waste-to-energy combined heat and power plants as well as from biofuels. In Joniškis and Švenčionys, Gren serves its customers – residents and businesses – with efficient and sustainable district heating produced mainly from local biofuels.

      • Gren will continue all the operations and services previously provided by Fortum’s heating & cooling businesses in the Baltics. The change does not affect the customers, partners, other stakeholders, or the prices of Gren’s services and products.

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