Our portfolio

Examples of our portfolio

Here are some examples from our portfolio. The production plants are in Estonia, Latvia, Lithuania and the United Kingdom. We revise our operations to meet the requirements of ISO 9001, ISO 14001, ISO 45001 management system standards.

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Production sites Icon of heated building
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1,314 MW

Total production capacity Icon of regenerative energy
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2.3 TWh

Heat sales Icon of social care
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0.7 TWh

Electricity sales Icon of green energy

(*Including share of associated district heating companies.)


In Estonia, we focus on developing sustainable energy solutions that meet local community needs and provide comfort for our customers.

In Tartu and Pärnu, we supply industrial businesses, housing associations, and individual homes with clean, reliable and comfortable district heating. It’s produced in our biomass combined-heat power plants from local and renewable energy. We can also provide heat to customers using traditional heat-only boiler (HOB) plants (biomass and gas-fired), as well as re-using excess heat from local industry, such as a local printing plant in Tartu.

District cooling is our newest method of energy production – we opened the first river-based district cooling plant in the Baltic region in Tartu, Estonia. Our district heating and cooling networks are connected via heat pumps, forming an integrated energy system.

Using biomass for heat and power – Tartu

Our biomass plant in Tartu generates heat and power using local wood chips and milled peat – much of the peat comes from our own peat deposits. The plant provides district heating to approximately 1,900 customers and 72,000 local people. Our plant is one of the most efficient and advanced systems in Estonia.

Gren Tartu

Using biomass for heat and power – Pärnu

Our biomass plant in Pärnu generates heat and power using local biofuels, providing district heating to approximately 890 customers and 19,000 people. The electricity we produce is sold to NordPool and other large industrial customers. We’ve launched a series of new products for local industrial customers too, and we’re supplying customers with steam and electricity via a direct line.

Gren Parnu

Downtown district cooling plant – Tartu

We operate an environmentally friendly and high-efficiency district cooling plant in Tartu. It’s located by the Emajõgi River and uses the river’s cool water as a natural cooling resource.



Downtown district cooling plant in Pärnu

Our district cooling plant in Pärnu uses Pärnu’s river water as a natural cooling source and has the capacity to connect every downtown public building to its network. We also have cooperation, e.g., with the Pärnu Keskus shopping centre.



Aardla district cooling plant – Tartu

Aardla district cooling plant’s initial capacity was designed to serve Lõunakeskus – It’s the largest shopping and leisure centre in Southern Estonia. We supply the centre and the buildings nearby.


In Jelgava and Daugavpils, we focus on renewables. We produce energy using local resources, support customers and local communities, and strive for a positive environmental impact.

We are a district heating operator in Jelgava, so we provide households, public buildings and businesses with sustainable, reliable heat produced from local, renewable resources. 92% of Jelgava’s heat production comes from renewables.

In Daugavpils, we work with the city’s district heating operator, supplying around 15% of the city’s heating needs, and we also supply heat energy to the district heating system in Riga.

Our electricity production is mainly from renewables – biomass and wind – with a small portion from natural gas. We sell our electricity via NordPool and also sell to some large industrial customers.

Using biomass for heat and power – Jelgava

Our combined heat and power plant in Jelgava uses local renewable energy resources – primarily wood chips – to provide district heating to approximately 16,000 households and 173 B2B customers. The largest plant of its kind in Latvia has improved the overall efficiency and security of district heating, reducing CO2 emissions from heat production by 90%. We’re working on a new fuel diversification project that will add 35% refuse-derived fuel to the biomass.

Gren Jelgava CHP

Using biomass for heat and power – Riga

Our biomass cogeneration plant in Riga produces electricity and heat from a local, renewable energy resource: wood chips. The heat energy is transferred to the city’s district heating system.


In Lithuania, we operate in Akmenė, Joniškis, Kaunas, Klaipėda, Švenčionys, Trakai, Vilnius and Visaginas. We generate sustainable, clean energy solutions from non-hazardous municipal and industrial waste. We supply safe and efficient district heating generated mainly from biofuels, and we also allocate and supply gas.

In Klaipėda and Kaunas, we supply city district heating companies with heat energy produced from non-hazardous municipal and industrial waste, as well as energy from biofuels. Our combined heat and power plants provide a sustainable solution for heating and make waste management more sustainable. The waste goes into heat and power production instead of landfills. The electricity produced from that waste is sold to NordPool.

In Akmenė, Joniškis, Švenčionys and Trakai we supply residents and businesses with efficient district heating, produced from local biofuels and natural gas. In Vilnius and Visaginas, we operate as independent heat producers.

Waste-to-energy in Klaipeda

Our waste-to-energy combined heat and power plant in Klaipeda is the first plant of its kind in Lithuania. It uses non-hazardous municipal and industrial waste and biofuels to produce heat for residents and local businesses. The plant’s boiler can incinerate up to 255 thousand tons of waste and biofuel a year. This clean and effective energy production method has helped to keep more than 1.5 million tons of waste out of landfills. The plant has become a leading example for the energy industry in managing waste and adding efficiency.

Waste-to-energy in Kaunas

This joint waste-to-energy combined heat and power plant uses non-hazardous municipal and industrial waste to produce heat for residents and local businesses. The Kaunas plant is the country’s second plant of its kind. The plant’s waste fuel boiler can incinerate 255 thousand tons of waste per year. Our Kaunas CHP plant was built to align with the National Lithuanian Energy Strategy.

United Kingdom

In 2023, Gren acquired a network of waste and biomass assets, which play a key role in baseload energy production and reducing waste to landfills.

Gren plans to invest up to £1 billion in district heating and local energy systems that will deliver affordable green energy to over 200,000 homes and thousands of businesses in the UK, with sites among others in Wick, Sheffield and Nottingham.

We supply heat and electricity to homes, businesses, hospitals, schools, farms and industries across the UK. We develop and deliver energy solutions, ranging from district heating to renewable and industrial energy, to meet the needs of customers and communities. Our local solutions play an integral role in the delivery of a flexible, smart energy future. Decentralised energy solutions are low carbon and efficient, offering users more choice and control of their energy costs.

Combined Heat and Power

Combined Heat and Power (CHP) is a highly efficient process that captures and utilises the heat that is a by-product of the electricity generation process. By generating heat and power simultaneously, CHP can reduce carbon emissions by up to 30% compared to separate means of conventional generation via a boiler and power station.

Electricity for local communities and businesses

Our Combined Heat and Power plants generate electricity for local communities and businesses and the national grid.