BMW's new fuel cell car might one day use hydrogen fuel from Plug Power...if Plug Power is still around to sell that fuel.Plug Power (PLUG 7.45%) stock leaped 7.1% higher through 10:50 a.m. ET Monday on the back of "news" that hydrogen power is getting more popular.Over the weekend, BMW (BAMXF -0.21%) (BMWYY -0.70%) announced plans to mass-produce its first-ever hydrogen fuel cell automobile with assistance from Toyota Motor (TM -0.10%). And seeing as Plug Power aims to become the world's biggest producer o ...