A wind guide system to speed up wind at a wind turbine and thereby improve its energy production is disclosed. The wind guide system is built with modules like load-bearing piles, steel sheet piles, shipping containers or straw bales. The main purposes of the invention are to save overall costs for new wind guide system installations to improve the cost of renewable energy, to reduce the CO2 footprint of the wind guide system and to adapt it better to site conditions and the environment. The main cost savings comprise manufacturing costs, transportation costs from the factory to the often-remote wind turbine sites and installation cost and time.

A method of manufacturing wind turbine blades of variable length with connection elements with the rotor hub. The method includes providing and using enlarged manufacturing molds having a common zone of a predetermined length and, at least, an adaptive zone arranged with the length needed for manufacturing the blades with a desired length, particularly the length required for optimizing the annual energy production (AEP) of a predetermined wind turbine model in a predetermined site.

A wind turbine generator (10) includes a tower (12), a nacelle (14) rotatably mounted to the tower (12), the nacelle having a longitudinal axis and being configured to align the longitudinal axis with the direction of the incoming wind during operation of the wind turbine generator (10), one or more heat-generating components (22) housed in the wind turbine generator (10), and a containerized HVAC module (26) mounted on a roof (31) of the nacelle (14) and operably connected to the one or more heat-generating h components (22) for cooling the heat-generating components (22). The module (26) includes a shipping container (30) having a floor (32), a roof (34), a pair opposed longer side walls (36), a pair of opposed shorter end walls (38), and a longitudinal axis, the longitudinal axis of the shipping container (30) being oriented generally perpendicular to the longitudinal axis of the nacelle (14), the shipping container (30) having at least one heat exchanger (40) therein.