We were born out of a need to create a safer and more eco-friendly way of producing energy in a smoky city. Today, we are an internationally esteemed developer of the energy industry.

1877 Finland’s first electric lighting trial is carried out at the VR machine shop in Helsinki on 10 December. The city is mainly lit up by gas.

1884 Daniel Johannes Wadén establishes the first electricity company in Helsinki. No extensive and harmonised electricity network is built straight away, but electricity is distributed from substations serving each city block. Overhead power lines criss-cross the town.

1890 Helsingin Sähkövalaistus Osakeyhtiö starts its operations. The distribution area encompasses the southern areas of Helsinki.

1900 Tram lines are powered by electricity instead of horsepower. The first electric tram line runs between Töölö and Hietalahti. All trams are operated by electricity in 1914.

1907 The City Council of Helsinki decides on the building of an electric power plant on the headland of Sörnäinen in the Suvilahti area.

Katulamppujen vaihtoa Stockan edustalla vuonna 1934.

1908 The construction work of the Suvilahti steam power plant starts and lasts for two years. The power plant is Finland’s first building made of reinforced concrete. The elevation drawings of the buildings are drawn by Selim A. Lindqvist. Construction of the electricity network starts.

1908 The chimney stack of Suvilahti is built.

1909 After long consideration, the numerous small electricity companies in Helsinki are transferred to the ownership of the City, and the electricity company of the City of Helsinki is established. Municipalisation of the operations is based on legislative, economic and safety factors.

The Suvilahti steam turbine plant starts its operations in July. In the same year, the exhibition of the electricity works is opened in a new administration building at the corner of Pieni Roobertinkatu and Kasarmikatu. It exhibited ‘foot warmers and other heat radiators, irons, coffeepots, lamps, etc. electrical equipment’. These days, the name of our home energy advisory centre is the Energy Gallery.

1911 The Töölö substation is built on the corner of Runeberginkatu and Töölönkatu. Töölö is undergoing a busy construction phase, and electric lights are installed in the new, modern apartment blocks. The Kallio substation is also completed in Kaarlenkatu later in the same year.

1914–1918 The war puts a stop to fuel imports to Finland. Wood is introduced as raw material for energy generation. In 1917, accelerating inflation starts to hamper the operations of power plants. Towards the end of the Civil War, the Executive Committee of the Workers takes on the lead in the operations of the city’s technical plants. As a result, the directors, engineers and office workers of the plants stop working.

1929 The electricity and gas plants compete for customers. Electricity is mainly used for indoor and outdoor lighting while gas is used in homes and in industry. The gasworks campaign strongly for gas cookers in order to prevent electric cookers from taking over the market. Gradually, electric cookers become more common.

1930 Statistics on domestic appliances in Helsinki are drawn up in connection with the population census. The city has, e.g. 18,048 irons and 9,958 vacuum cleaners.

1939–1945 There is a shortage of energy due to the war. The electricity works have to urge citizens to save electricity. Along with the arrival of migrants, the city’s population grows by 20,000-30,000 people and the energy demand is huge. Distribution outages cannot be avoided.


 After the war, a new plan for the country's energy supply is drawn up to stop excessive dependence on imported fuels. Areas that had previously produced hydropower have been lost. Electricity distribution and the construction of networks are hampered by a shortage of materials, and electricity has to be rationed.

1953 Salmisaari A power plant in Ruoholahti is commissioned. The plant produces both district heat and electricity.

1957 Water-based district heating is launched in Helsinki when the Hotel and Restaurant School in Perhonkatu 11 is connected to the water district heating network.

1960 Hanasaari A power plant is commissioned in the Sörnäinen energy supply area. The power plant was designed by architect Vera Rosendahl who was also involved in the design of the Salmisaari power plant. 

1973 Sähkötalo, which is designed by Alvar Aalto, is completed in Kamppi in connection with the substation. Sähkötalo is used as the new administrative building of the electricity works.

1974 Hanasaari B power plant is commissioned to meet the city’s growing energy needs. A couple of years later, the Suvilahti power plant is decommissioned and later refurbished into a storage warehouse and a sports facility for the employees of the energy works. The premises of the gas works are used as an arts centre in the 1980s.

1977 Helsinki Energy Board is established when the electricity works and gas works are combined at the decision of the City Council. The gas works continues its operations as the gas department of the Helsinki Energy Board. 

1981 The foundation stone of Salmisaari B power plant is laid.

1984 Salmisaari B power plant is commissioned. Three years later, the desulphurisation plant is also commissioned at Salmisaari.

1991 The natural gas era begins when Vuosaari A power plant starts its operations. The Hanasaari desulphurisation plant is commissioned in the same year.

1995 Helsinki Energy Board becomes a municipal public utility, and its new name is Helsingin Energia. The Electricity Market Act enters into force on 1 June and the sale of electricity is deregulated, first for major companies and in 1998 also for households and small companies.

2000 District cooling operations start in the Ruoholahti district.

2007 Hanasaari A power plant in Sörnäinen is demolished. The Society for the Industrial Heritage gives Helsingin Energia an industrial heritage award for the demolition work. According to the society, the documentation related to the power plant demolition was the most extensive recording ever performed in the termination of industrial operations in Finland. The Suvilahti plant reopens as a cultural venue.

2008 European Parliament selects Helsingin Energia as winner of the Regional Awards competition. According to the reasons for selecting Helsingin Energia, the company is a world leader in energy efficiency.

2009 Helsingin Energia as a company is 100 years old.

2010 The City Council of Helsinki approves our development programme Towards a Carbon Neutral Future. The development programme includes an action plan to achieve the 2020 climate targets and the outline of activities until 2050. The programme is implemented as significant investment projects.

2012 We launch sales of electric vehicle charging points and services related to the production of solar energy. Development of the smart grid and new services is accelerated once the installation of remotely read meters is completed. Test combustion of pellets starts at the Hanasaari power plant.

2015 Our company form changes. Limited liability company Helen Ltd continues in the footsteps of the Helsingin Energia concern.