The Vuosaari Bioenergy Heating Plant is part of Helsinki City-owned utility Helen Ltd's carbon-neutrality programme. It consists of a boiler building, a heat recovery system, and a biofuel system. The plant's logistical organisation prioritises safety and flow. With a capacity of 260 MW, the plant makes a quarter of Helsinki's district heating. The large boiler building is located in the central part of the site, and the smaller fuel system buildings are on the western side of the site, close to the public's routes. This arrangement softens the impact of the plant's industrial scale on the surrounding environment. The abstract formal language and neutral palette of materials and colours of the bioenergy heating plant's architecture aim at a timeless architectural expression. The double façade structures control and harmonise the appearance of the different buildings. They allow the process and building services to be freely positioned behind the surface cladding without compromising the visual quality of the building exteriors. Operationally, the Vuosaari Bioenergy Heating Plant meets a vital basic need by providing the city with sustainable district heating. Its architecture aims to convey the value and importance of this activity.