b ikes . ▁ ▁Part icular ▁aspects : ▁integration ▁with ▁a ▁smart ▁city ▁concept , ▁building - to - grid ▁( B 2 G , ▁meaning ▁that ▁buildings ▁integrated ▁with ▁smart ▁gr ids ▁and ▁supported ▁by ▁building ▁control ▁systems ▁and ▁information ▁technology ▁will ▁use ▁previously ▁un util ised ▁degrees ▁of ▁freedom ▁( shift able ▁loads , ▁load ▁shed ding , ▁partial ▁load ▁operation , ▁etc .) ▁to ▁optim ise ▁grid ▁operation ). , ▁Ve h icle ▁to ▁Grid ▁( V 2 G ), ▁direct - current ▁charg ing ▁stations . ▁ ▁See ▁also ▁▁ ▁E URE LECT R IC ▁( E URE LECT R IC ▁– ▁the ▁European ▁association ▁representing ▁the ▁electric ity ▁industry ) ▁ ▁S iem ens ▁ ▁External ▁links ▁ ▁Item izations ▁▁ ▁Category : Europe an ▁Union ▁and ▁science ▁and ▁technology ▁Category : Transport ▁and ▁the ▁European ▁Union <0x0A> </s> ▁A ktiv ▁Was ▁tra dem ark ▁of ▁Swedish ▁A ktiv ▁M ask in ▁Ö sters und ▁l td . ▁Company ▁started ▁producing ▁agricult ure ▁machines ▁and ▁track ed ▁vehicles . ▁Company ▁sold ▁agricult ure ▁division ▁to ▁Elect rol ux ▁and ▁focused ▁to ▁track ed ▁vehicles ▁in ▁ 1 9 8 0 . ▁Company ▁stopped ▁working ▁in ▁ 1 9 9 1 . ▁ ▁A ktiv ▁started ▁making ▁track ed ▁vehicles ▁ 1 9 5 7 ▁when ▁they ▁started ▁making ▁Snow ▁T rac , ▁a ▁small ▁personal ▁Snow cat ▁that ▁is ▁roughly ▁the ▁size ▁of ▁a ▁modern ▁compact ▁car . ▁A ktiv ▁started ▁making ▁small ▁snow m ob iles ▁in