The tunnel, located in Madrid, will enable Gamesa to fully test rotors with three blades and a hub. It would be able to carry out aerodynamic noise measurements, dynamic tests and simulations, the firm said.
Gamesa project development manager Antonio de la Torre said testing previously had to take place outside Spain. The new facility will "enable static testing of turbine blades by simulating the incidence of wind from any direction and at any type of site", he added.
The facility is planned to be 70-metres long and 50-metres wide and is due to be operational by the end of 2016.
Gamesa's research and development operations are based in Spain. It is currently testing a prototype G132 5MW onshore turbine with a 132-metre rotor at its facility in Alaiz, northern Spain. Gamesa said the G132's 64.5-metre blades are the longest to have been transported in Spain.
The manufacturer has also installed its G114-2.5MW turbine, its first 2.5MW machine, for testing at Alaiz.