Plug Power Inc (NASDAQ: PLUG) closed at $2.83, down 3.41%. Trading volume reached 121 million shares, about 2 times its three-month average of 76 million.
U.S. markets ended slightly higher. The S&P 500 (SNPINDEX:^GSPC) edged up 0.062% to 6,715.35, while the Nasdaq Composite (NASDAQINDEX:^IXIC) gained 0.39% to 22,844.05.
Among hydrogen energy peers, Bloom Energy Corp (NYSE: BE) fell 2.43% to $88.00, and FuelCell Energy Inc (NASDAQ: FCEL) dipped 0.57% to $8.68.