In Otaniemi, Espoo, we look deep beneath the surface – as deep as seven kilometres. It is the site where St1 Deep Heat Oy is constructing two deep-rock wells and the first geothermal heating plant in Finland.
Delete is in charge of water management at Otaniemi deep-rock well site. When a hole is being drilled into granite, water from the surrounding bedrock starts to fill it. The compressed air and the rock material broken by the drill bring the water to the surface. On the ground, solids are separated from the water. The water is directed into containers emptied by Delete’s suction vehicles when necessary. At its busiest, a suction vehicle tank is filled in a couple of hours.