"propelled in part by the suns rays" sticks out in the article, i suspect it still needs fuel to move, it's just the electrical grid is powered by solar energy.

>While other ships have used solar panels before to power small electronics like auxiliary lights, the Auriga Leader is the first craft to direct solar power into the ship’s main electrical grid. Energy from 328 panels is helping to power the ship’s thrusters, hydraulics and steering gear, providing about 10 percent of the ship’s total electricity usage.

On the bright side when your ship runs out of fuel and you're doomed to drift until your supplies run out/sink/run aground, you'll have plenty of power to watch porn.