▁the ▁tur bine ▁is ▁proportional ▁to ▁the ▁square ▁of ▁its ▁bla de - length . ▁ ▁The ▁maximum ▁bla de - length ▁of ▁a ▁tur bine ▁is ▁limited ▁by ▁both ▁the ▁strength , ▁the ▁st iff ness ▁of ▁its ▁material , ▁and ▁transport ation ▁consider ations . ▁ ▁Labor ▁and ▁maintenance ▁costs ▁increase ▁only ▁gradually ▁with ▁increasing ▁tur bine ▁size , ▁so ▁to ▁minim ize ▁costs , ▁wind ▁farm ▁tur b ines ▁are ▁basically ▁limited ▁by ▁the ▁strength ▁of ▁materials , ▁and ▁sit ing ▁requirements . ▁ ▁Typ ical ▁modern ▁wind ▁tur b ines ▁have ▁diam eters ▁of ▁ ▁and ▁are ▁r ated ▁between ▁ 5 0 0   k W ▁and ▁ 2 ▁M W . ▁As ▁of ▁ 2 0 1 7 ▁the ▁most ▁powerful ▁tur bine , ▁the ▁V est as ▁V - 1 6 4 , ▁is ▁r ated ▁at ▁ 9 . 5 ▁M W ▁and ▁has ▁a ▁rot or ▁diameter ▁of ▁ 1 6 4 m . ▁ ▁In cre asing ly ▁large ▁wind ▁tur b ines ▁are ▁being ▁designed , ▁manufact ur ers ▁have ▁not ▁yet ▁come ▁close ▁to ▁the ▁maximum ▁size . ▁The ▁largest ▁tur b ines ▁will ▁be ▁ 2 6 5 ▁metres ▁or ▁more . ▁ ▁N ac elle ▁▁ ▁The ▁nac elle ▁is ▁housing ▁the ▁g ear box ▁and ▁generator ▁connecting ▁the ▁tower ▁and ▁rot or . ▁S ens ors ▁detect ▁the ▁wind ▁speed ▁and ▁direction , ▁and ▁mot ors ▁turn ▁the ▁nac elle ▁into ▁the ▁wind ▁to ▁maxim ize ▁output .