gen - power ed ▁engines ▁and ▁vehicles ▁ ▁Since ▁the ▁late ▁ 1 9 9 0 s , ▁Trop ical ▁has ▁inv ested ▁heavily ▁in ▁research ▁and ▁development ▁of ▁a ▁wide ▁variety ▁of ▁hydro gen - power ed ▁gener ators , ▁app li ances ▁and ▁vehicles . ▁A ▁number ▁of ▁hydro gen - power ed ▁vehicles ▁have ▁been ▁introduced ▁since ▁ 2 0 0 5 , ▁including ▁ 2 - ▁and ▁ 4 - se at ▁city ▁cars , ▁light ▁tr uck s , ▁bus es , ▁sc oot ers , ▁for kl ifts ▁and ▁A TV ’ s ▁( the ▁vehicles ▁are ▁only ▁assemble d ▁by ▁the ▁company ▁and ▁are ▁also ▁available ▁with ▁" con vent ional " ▁electric ▁engines ). ▁Two ▁hydro gen - power ed ▁city ▁cars ▁have ▁even ▁been ▁export ed , ▁to ▁Portugal ▁and ▁South ▁Korea . ▁In ▁November ▁ 2 0 0 7 ▁it ▁introduced ▁the ▁first ▁hydro gen ▁ref uel ing ▁plant ▁power ed ▁by ▁wind ▁gener ators ▁( develop ed ▁in ▁collaboration ▁with ▁Greek ▁research ▁instit utes ), ▁while ▁in ▁January ▁ 2 0 0 8 ▁it ▁was ▁one ▁of ▁three ▁Greek ▁companies ▁to ▁receive ▁an ▁award ▁for ▁innov ation ▁by ▁Bill ▁G ates . ▁A ▁new ▁city ▁car ▁was ▁introduced ▁in ▁ 2 0 0 8 ▁( strong ly ▁res emb ling ▁the ▁Sm art ▁Fort wo ), ▁while ▁latest ▁research ▁projects ▁include ▁the ▁" zero - acc ident ▁electric ▁car " ▁designed ▁with ▁the ▁aim ▁to ▁provide ▁complete ▁safety ▁to ▁its ▁passengers .