1 0 0 ▁years . ▁▁ ▁However , ▁some ▁cons ▁do ▁exist . ▁The ▁systems ▁require ▁tur bul ent ▁water ▁to ▁power ▁them , ▁meaning ▁a ▁large ▁foundation ▁needs ▁to ▁be ▁built , ▁which ▁can ▁result ▁in ▁habitat ▁destruction . ▁The ▁greatest ▁off ender ▁is ▁the ▁tid al ▁bar rage ▁system ▁which ▁util izes ▁d ams ▁that ▁can ▁imp ede ▁the ▁movement ▁of ▁sea ▁life ▁and ▁potentially ▁w re ak ▁hav oc ▁on ▁aqu atic ▁e cos ystem s . ▁T idal ▁energy ▁systems ▁also ▁have ▁a ▁high ▁up front ▁cost . ▁Although ▁they ▁have ▁long ▁lif esp ans ▁and ▁eventually ▁pay ▁themselves ▁off , ▁govern ments ▁are ▁more ▁concerned ▁with ▁their ▁ 5 - year ▁budget ▁rather ▁than ▁a ▁ 6 0 - year ▁projection . ▁ ▁N uc lear ▁Energy ▁ ▁There ▁has ▁been ▁a ▁debate ▁around ▁whether ▁nuclear ▁energy ▁is ▁considered ▁renew able ▁or ▁not . ▁As ▁it ▁is ▁still ▁unknown ▁whether ▁nuclear ▁energy ▁is ▁a ▁vi able ▁renew able ▁energy ▁source , ▁it ▁will ▁not ▁be ▁included ▁in ▁this ▁page ' s ▁discussion . ▁ ▁Legisl ation ▁ ▁United ▁States ▁ ▁Federal ▁Legisl ation ▁▁ 1 . ▁The ▁Energy ▁Policy ▁Act ▁of ▁ 2 0 0 5 ▁This ▁act ▁was ▁en act ed ▁by ▁the ▁ 1 0 9 th ▁U . S . ▁Congress ▁and ▁signed ▁into ▁legisl ation ▁by ▁President ▁George ▁W . ▁Bush ▁on ▁ 8 ▁August ▁ 2 0 0 5 . ▁It ▁addresses ▁multiple ▁fac ets ▁of ▁energy ▁production ▁in ▁the ▁United ▁States ,