d rew ▁ 7 8 % ▁of ▁its ▁land ▁from ▁possible ▁solar ▁development , ▁leaving ▁ ▁still ▁open ▁to ▁applications ▁for ▁solar ▁install ations , ▁an ▁area ▁nearly ▁as ▁large ▁as ▁South ▁Carolina . ▁Of ▁the ▁area ▁left ▁open ▁to ▁solar ▁propos als , ▁the ▁B LM ▁has ▁identified ▁ ▁in ▁highly ▁favor able ▁areas ▁it ▁calls ▁Sol ar ▁Energy ▁Z ones . ▁In ▁Spain , ▁with ▁natural ▁gas ▁back ups , ▁C SP ▁has ▁reached ▁a ▁capacity ▁factor ▁of ▁ 6 6 %, ▁with ▁ 7 5 % ▁being ▁a ▁theoretical ▁maximum . ▁ ▁See ▁also ▁▁ ▁Carter ▁Do ctrine ▁ ▁The ▁Cl imate ▁Reg istry ▁ ▁E fficient ▁energy ▁use ▁ ▁Energy ▁conservation ▁in ▁the ▁United ▁States ▁ ▁Energy ▁policy ▁of ▁the ▁United ▁States ▁ ▁World ▁energy ▁resources ▁ ▁World ▁energy ▁consumption ▁ ▁List ▁of ▁countries ▁by ▁energy ▁consumption ▁and ▁production ▁ ▁List ▁of ▁countries ▁by ▁energy ▁consumption ▁per ▁cap ita ▁ ▁List ▁of ▁U . S . ▁states ▁by ▁electric ity ▁production ▁from ▁renew able ▁sources ▁ ▁References ▁ ▁Further ▁reading ▁G A ▁Mans o ori , ▁N ▁En ay ati , ▁L B ▁A gy ark o ▁( 2 0 1 6 ), ▁Energy : ▁S ources , ▁Util ization , ▁Legisl ation , ▁S ust ain ability , ▁Illinois ▁as ▁Model ▁State , ▁World ▁Sci . ▁Pub . ▁Co ., ▁ ▁T ough ▁Love ▁for ▁Ren ew able ▁Energy ; ▁M aking ▁Wind ▁and ▁Sol ar ▁Power ▁Aff ord able ▁May / J une ▁ 2 0 1