Plug Power is a clean energy stock with loads of potential and risk.

Pollution regulators had high hopes for plug-in hybrid cars. There's just one problem: many owners don't plug them in. Volkswagen, Mercedes-Benz and BMW saved billions of dollars in emissions ...

Are plug-in hybrids an on-ramp to fully electric vehicles, or undue cost and complexity? Are they something consumers asked for, or something created by bureaucrats and regulators? At least in some ...

Plug-in hybrids can theoretically serve as stepping stones to all-electric vehicles, providing enough electric range for short trips while still offering the flexibility […] ...