. ▁All ▁bodies ▁of ▁water . ▁W et lands . ▁Urban ▁areas . ▁ ▁Energy ▁efficiency ▁Energy ▁efficiency ▁means ▁doing ▁the ▁same ▁work , ▁or ▁more , ▁and ▁enjo ying ▁the ▁same ▁comfort ▁level ▁with ▁less ▁energy . ▁Con sequently , ▁energy ▁efficiency ▁can ▁be ▁considered ▁part ▁of ▁your ▁state ' s ▁energy ▁resource ▁base   – ▁a ▁demand ▁side ▁resource . ▁Un like ▁energy ▁conservation , ▁which ▁is ▁root ed ▁in ▁behavior , ▁energy ▁efficiency ▁is ▁technology - based . ▁This ▁means ▁the ▁sav ings ▁may ▁be ▁predicted ▁by ▁engineering ▁calculations , ▁and ▁they ▁are ▁sust ained ▁over ▁time . ▁Ex amples ▁of ▁energy ▁efficiency ▁measures ▁and ▁equipment ▁include ▁compact ▁flu ores cent ▁light ▁bul bs ▁( CF L s ), ▁and ▁high ▁efficiency ▁air ▁condition ers , ▁re fr iger ators , ▁bo ilers , ▁and ▁ch ill ers . ▁ ▁S aving ▁energy ▁through ▁efficiency ▁is ▁less ▁expensive ▁than ▁building ▁new ▁power ▁plants . ▁Util ities ▁can ▁plan ▁for , ▁invest ▁in , ▁and ▁add ▁up ▁technology - based ▁energy ▁efficiency ▁measures ▁and , ▁as ▁a ▁consequence , ▁de fer ▁or ▁avoid ▁the ▁need ▁to ▁build ▁a ▁new ▁power ▁plant . ▁In ▁this ▁way , ▁Austin , ▁Texas , ▁aggreg ated ▁enough ▁energy ▁sav ings ▁to ▁offset ▁the ▁need ▁for ▁a ▁planned ▁ 4 5 0 - m eg aw att ▁coal - f ired ▁power ▁plant . ▁Austin ▁achieved ▁these ▁sav ings ▁during ▁a ▁de cade ▁when ▁the ▁local ▁economy ▁grew ▁by ▁ 4 6 % ▁and ▁the ▁population