▁outside ▁L er wick ▁and ▁operated ▁by ▁Sh et land ▁Aer og ener ators ▁Ltd . ▁Since ▁opening ▁in ▁ 2 0 0 0 , ▁the ▁tur b ines ▁at ▁this ▁wind ▁farm ▁have ▁had ▁an ▁average ▁capacity ▁factor ▁of ▁ 5 2 % ▁and , ▁according ▁to ▁this ▁report , ▁in ▁ 2 0 0 5 ▁aver aged ▁a ▁world ▁record ▁ 5 7 . 9 %. ▁However , ▁a ▁Scottish ▁opposition ▁group ▁found ▁ 1 2 4 ▁separate ▁occasions ▁from ▁ 2 0 0 8 ▁to ▁ 2 0 1 0 ▁when ▁the ▁nation ' s ▁wind ▁output ▁fell ▁to ▁less ▁than ▁ 2 % ▁of ▁installed ▁capacity . ▁On ▁the ▁west ▁and ▁northern ▁coast s ▁Scotland ' s ▁wind ▁regime ▁can ▁provide ▁an ▁average ▁of ▁ 4 0 % ▁or ▁higher . ▁ ▁Pot ential ▁It ▁is ▁estimated ▁that ▁ 1 1 . 5 ▁G W ▁of ▁on sh ore ▁wind ▁potential ▁exists , ▁enough ▁to ▁provide ▁about ▁ 4 5 ▁T Wh ▁of ▁energy ▁in ▁a ▁year , ▁allowing ▁for ▁wind ▁vari ability . ▁More ▁than ▁double ▁this ▁amount ▁exists ▁on ▁off sh ore ▁sites ▁where ▁mean ▁wind ▁spe eds ▁are ▁greater ▁than ▁on ▁land . ▁The ▁total ▁off sh ore ▁potential ▁is ▁estimated ▁at ▁ 2 5 ▁G W , ▁and ▁although ▁more ▁expensive ▁to ▁install ▁could ▁be ▁enough ▁to ▁provide ▁almost ▁half ▁the ▁total ▁energy ▁used ▁in ▁Scotland . ▁ ▁According ▁to ▁a ▁recent ▁report , ▁the ▁world ' s ▁wind ▁market ▁offers ▁many ▁opportun ities ▁for