Why Plug Power Stock Dropped 10% This Morning

Shares of fuel cell maker Plug Power (PLUG -8.04%) tumbled 10% in early trading on the Nasdaq Thursday, before recovering to a (still sizable) 7.1% loss as of 1:05 p.m. ET, after a team of analysts at Susquehanna downgraded the stock from positive to neutral.Susquehanna also cut its price target on Plug stock in half, to just $4.50 per share.Better late than never?Reports on Susquehanna's reasons for the downgrade are a little confusing. The Fly, for example, quotes Susquehanna saying renewable energy stock ...