Plug Power Inc. PLUG, +5.75% said Wednesday that it completed the first installation of an electrolyzer system at a Amazon.com Inc. AMZN, -0.01% fulfillment center. Plug Power’s stock fell 1.3% in premarket trading, putting it on track to snap a three-day win streak in which it ran up 14.9%. The proton exchange membrane electrolyzer produces hydrogen to fuel more than 225 hydrogen fuel-cell powered forklift trucks at the site, in Aurora, Colo. Plug Power said it has worked with Amazon to deploy more than 1 ...