Plug Power Inc (NASDAQ:PLUG) stock has been treading south for most of the past year, with stock down over 74% during that period. Yet, over the past five days, the stock has gained more than 26%. Plug investors might view this sudden surge as potentially a dead cat bounce, rather than a definitive trend. Short Squeeze PotentialSo, what fueled the current rally in PLUG stock? Roth MKM analyst Craig Irwin on Jan. 31 upgraded the stock from Neutral to Buy and raised the price target from $4.50 to $9, citing continued progress of the company’s hydrogen plant in Georgia.Plug Power stock’s short in…