Plug Power (PLUG 1.91%) shares have soared more than 50% over the last three weeks. Those gains would have been even higher had it not been for a big drop this week. As of early Friday morning, Plug stock is down 10% since last Friday's close, according to data provided by S&P Global Market Intelligence.Green hydrogen generation networkCash and cash equivalents have dropped from about $690 million at the end of 2022 to just about$110 million on Sept. 30, 2023. That's due to delays in building its hydrogen ...