The 1960s
In the late 1960s, energy consumption started to increase and Finland needed more electricity production capacity. EPV Energy Ltd and Pohjolan Voima Oy established a new company, Vaskiluodon Voima Oy, with equal shares. The task of this joint company was to build a power plant in Vaskiluoto, Vaasa, that would produce both electricity and heat. The plant was completed in 1972. It had an electrical output of 160 MW and was fuelled by heavy fuel oil.

The 1970s
The oil crisis of the 1970s prompted Vaskiluodon Voima to look for a more economical fuel, and coal was chosen as the new energy source. A new coal-fired boiler was built and commissioned in 1982. The old heavy fuel oil boiler was stored for future use.

The 1980s
Vaskiluodon Voima expanded its operations significantly in the late 1980s by building a new power plant in Seinäjoki. At the time, the Seinäjoki plant produced 125 MW of electricity and 100 MW of district heating. The fuels chosen for the new plant were biofuels and energy peat, with the latter being the most natural source of energy in the region, thanks to local peat resources.

The 1990s
In 1996, Vaskiluodon Voima decided to increase the capacity of its coal-fired boiler in Vaasa by about 30% and to build a new turbine plant with an increased electrical capacity of 230 MW. The updated power plant was commissioned in autumn 1998.

The 2010s
In 2012, the world’s largest biomass gasification plant with a fuel capacity of 140 MW was completed in Vaskiluoto, Vaasa. Thanks to the gasification plant, the coal-fired power plant can also use wood and arable energy, as well as energy peat as fuel. Gas produced from domestic biofuels replaces 25–40% of the coal used at the time.

The gasification plant reduces the carbon dioxide emissions of the Vaasa power plant by about 230,000 tonnes per year. At the same time, new jobs are created, especially in biomass supply. The gasification plant’s permanent annual impact on employment is roughly 100 person-workyears.

Over the years, many upgrades have been made to various parts and components of the power plants and the site in Vaasa in order to reduce emissions. For example, in 2019, during the annual maintenance of the power plant, a new Selective Non-Catalytic Reduction (SNCR) system was installed in the main boiler to reduce nitrogen oxides in the combustion process. Ammonia, a decomposition product of urea in flue gases, reacts with the nitric oxide (NO) molecules in the flue gas to form nitrogen and water. As a result, we significantly reduce the nitrogen oxide (NOx) emissions resulting from the combustion process. Another major annual maintenance item was the power plant’s desulphurisation plant, involving the servicing of its flue gas cleaning system. The extraction system keeps the emissions from the stack under control. The desulphurisation plant filters out up to more than 99% of the sulphur dioxide emissions from the flue gases.