The Kymijärvi III bioenergy plant was built to replace an older coal-fired plant, reducing 600,000 tonnes of carbon dioxide emissions per year from district heating production at Lahti Energia Oy. The Kymijärvi III bioenergy plant operates at high efficiency with an efficient heat recovery system. The plant's water treatment process, a unique and innovative approach in Finland, involves capturing the moisture in the biofuel mass and recycling it in the process, making the plant almost self-sufficient in water consumption.

The bioenergy plant's main façade and chimney are made of rust-coloured weather-resistant steel. The material is high quality, rugged, beautiful, and has a strong industrial character.