▁scient ifique ▁( CN RS ), ▁and ▁T ec sol , ▁a ▁local ▁engineering ▁office . ▁ ▁THE M IS ▁still ▁has ▁its ▁ 2 0 1 ▁sun - follow ing ▁devices ▁called ▁hel i ost ats , ▁most ▁of ▁them ▁still ▁equ ipped ▁with ▁mirror s ▁( 5 3 . 7 0   m ² ▁each ) ▁covering ▁an ▁area ▁of ▁ 1 1 , 8 0 0   m ² ▁in ▁total , ▁able ▁to ▁send ▁the ▁solar ▁energy ▁towards ▁the ▁hot ▁spot ▁at ▁the ▁top ▁of ▁the ▁ 1 0 4   m ▁central ▁tower , ▁where ▁the ▁receiver ▁was ▁originally ▁placed ▁( which ▁is ▁now ▁part ▁of ▁the ▁exhibition ▁outside ▁the ▁O de illo ▁solar ▁furn ace ). ▁The ▁hel i ost ats ▁are , ▁however , ▁no ▁longer ▁oper ational . ▁ ▁The ▁three ▁rows ▁of ▁hel i ost ats ▁fur th est ▁away ▁from ▁the ▁tower ▁are ▁having ▁their ▁mirror s ▁replaced ▁by ▁solar ▁cells . ▁Of ▁these ▁cells , ▁some ▁will ▁follow ▁the ▁sun ▁while ▁others ▁will ▁not , ▁so ▁as ▁to ▁measure ▁the ▁difference ▁in ▁efficiency . ▁ ▁The ▁C N RS ▁re h abil itation ▁project ▁has ▁rep a ired ▁half ▁of ▁the ▁hel i ost ats ▁in ▁order ▁to ▁develop ▁a ▁power ▁of ▁ 1   M We , ▁by ▁means ▁of ▁a ▁gas ▁tur bine ▁installed ▁at ▁the ▁top ▁of ▁the ▁tower , ▁fed ▁either ▁with ▁hot ▁air ▁directly ▁from ▁an ▁air ▁receiver ▁( PE G ASE ▁project ) ▁or ▁a ▁receiver