▁highest ▁is ▁Wy oming , ▁at ▁slightly ▁over ▁ ▁per ▁year . ▁ ▁Other ▁regional ▁differences ▁stem ▁from ▁energy ▁efficiency ▁measures ▁taken ▁at ▁the ▁local ▁and ▁state ▁levels . ▁California ▁has ▁some ▁of ▁the ▁strict est ▁environmental ▁laws ▁and ▁building ▁codes ▁in ▁the ▁country , ▁leading ▁its ▁per - house hold ▁energy ▁consumption ▁to ▁be ▁lower ▁than ▁all ▁other ▁states ▁except ▁Hawai i . ▁ ▁The ▁land - use ▁dec isions ▁of ▁cities ▁and ▁towns ▁also ▁explain ▁some ▁of ▁the ▁regional ▁differences ▁in ▁energy ▁use . ▁Town h ouses ▁are ▁more ▁energy ▁efficient ▁than ▁single - family ▁homes ▁because ▁less ▁heat , ▁for ▁example , ▁is ▁was ted ▁per ▁person . ▁Similarly , ▁areas ▁with ▁more ▁homes ▁in ▁a ▁compact ▁neighborhood ▁encou rage ▁walking , ▁b ik ing ▁and ▁trans it , ▁thereby ▁reducing ▁transport ation ▁energy ▁use . ▁A ▁ 2 0 1 1 ▁US ▁E PA ▁study ▁found ▁that ▁multi - family ▁homes ▁in ▁urban ▁neighborhood s , ▁with ▁well - ins ulated ▁buildings ▁and ▁fuel - efficient ▁cars , ▁can ▁save ▁more ▁than ▁ 2 / 3 ▁of ▁the ▁energy ▁used ▁by ▁convention ally ▁built ▁single - family ▁houses ▁in ▁sub urban ▁areas ▁( with ▁standard ▁cars ). ▁ ▁Electric ity ▁ ▁The ▁United ▁States ▁is ▁the ▁world ' s ▁second ▁largest ▁producer ▁and ▁consumer ▁of ▁electric ity . ▁It ▁cons umes ▁about ▁ 2 0 % ▁of ▁the ▁world ' s ▁electric ity ▁supply . ▁This ▁section ▁provides ▁a ▁summary ▁of ▁the ▁consumption ▁and ▁generation ▁of ▁the ▁nation '