Siemens Gamesa has upgraded its onshore platform by increasing power output to 6.6MW. The new SG 6.6-155 and SG 6.6-170 turbines will now offer a higher unitary power.Both turbines combine a flexible power rating from 5.6MW to 6.6MW with rotor diameters of 155 and 170 meters. The first prototypes of the Siemens Gamesa 5.X, the SG 6.6-155 (in Alaiz, Spain) and the SG 6.6-170 (Hovsore, Denmark), are currently up and connected and in the testing phase.