For over fifty years, the Hanasaari power plant has played a central role in Helsinki’s development, providing both electricity and heating to the city while mirroring Finland’s shifting energy landscape.
Hanasaari’s story begins in the late 1950s, when Helsinki aimed to strengthen its energy supply. The first facility, Hanasaari A, started operations in 1960, supporting the city’s rapid growth. As energy demand increased, Hanasaari B was introduced in 1974, offering more advanced technology and modern architectural design.
Hanasaari B was unique because it produced both electricity and district heating, serving homes and businesses throughout Helsinki. Its ability to generate power and heat simultaneously made it especially important during Finland’s long, cold winters. At full capacity, the plant could produce up to 220 megawatts of electricity and more than 400 megawatts of heat, delivering reliable energy for much of the city.
Coal was the main source of fuel for Hanasaari’s operations for many years. Although the plant helped improve air quality compared to older factories, it eventually became a focal point in discussions about climate change and environmental responsibility. With new climate policies from Finland and the European Union, there was increasing momentum to move away from coal and invest in cleaner energy options.
Helen Oy, the operator of Hanasaari, worked to modernise the plant by experimenting with biomass and upgrading technology. However, a decision was made to close the facility and shift focus to renewable energy, in line with Helsinki’s climate ambitions.
The official shutdown of Hanasaari B in April 2023 marked a significant milestone in Helsinki’s journey toward carbon neutrality. Since then, the city has turned its attention to the site’s future. Proposals now aim to preserve the power plant’s historic architecture, with community discussions exploring possibilities such as cultural centres, event spaces, or residential developments.
Although converting the site will require environmental clean-up and careful planning, the transformation project has inspired residents and city officials.
Today, Hanasaari represents both Helsinki’s industrial heritage and its drive toward a sustainable future. The story of Hanasaari power plant highlights the city’s ability to adapt and innovate, repurposing historic infrastructure to meet new challenges in the path toward a greener world.
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By: ONE Team
ONE is a nonprofit magazine founded in 2014, dedicated to providing unbiased and independent commentary and reporting on energy and environment issues. ONE policy pursues the following principles: accuracy, integrity and transparency.
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