Biden energy loan czar Jigar Shah was a major investor in a struggling green energy company that is in advanced talks to receive a $1.5 billion loan from his office. The Department of Energy’s loan office, where Shah serves as director, is working to fast-track the funding to Plug Power, a hydrogen fuel company on the brink of bankruptcy. But the ties between Plug Power and Shah could add to concerns from lawmakers about conflicts of interest in the federal loan program. Securities and Exchange Commission records detail a long-standing financial relationship between Plug Power and Generate Capital, an investment...