If even Plug Power can't earn profits from fuel cell hydrogen, what hope is there for Bloom Energy and FuelCell Energy? 'Twas the morning after Earth Day, and all through Wall Street, lots of fuel cell stocks were stirring this morning. As of 10:20 a.m. ET, shares of Plug Power (PLUG 5.42%) had risen 8.2%, Bloom Energy (BE 5.63%) was up by 9.3%, and FuelCell Energy (FCEL 10.81%) was doing best of all -- up 11.9%. Considering the calendar, investor interest in renewable energy stocks this week was probably t ...