Vestas Wind Systems A/S offers Kilowatt Turbine for Complex Terrain, V52-850 kW. Vestas Wind Systems A/S is an ISO 14001 and OHSAS 18001 certified company. Kilowatt Turbine for Complex Terrain is well suited to sites with restricted access. It is available with a. Compact dimensions, which makes it easy to transport and install. Kilowatt Turbine for Complex Terrain is offered in five different tower heights that vary from 44 m to 74 m. It is equipped with OptiSpeed registered trademark which maximizes the aerodynamic efficiency of the rotor in response to changing wind conditions.