Gravity7 foundation is used on a variety of geotechnical conditions: semi‑soft soil, load‑bearing soil, and solid rock. The loads are transferred from the tower to the ground through an anchor cage along with a wide and shallow foundation over large area of soil.
Peikko’s design optimizes the foundation size, weight, and costs. For example, a 5.5 MW turbine with a tower height of 120 meters uses:
- 700 m3 of concrete (70 truckloads)
- 90 t of steel (4,5 truckloads)
- 1 anchor cage (1 truckload)