State of Liberty Ferry, this transportation wave of the future will include solar-powered ferries with special sunshine-grabbing sails. It will be ferrying up to 600 passengers at a time to view the Statue of Liberty in New York and produce 50 percent less greenhouse gas emissions than regular gas-guzzling ferries. Covered with ray-absorbing, reflective-glass panels, the wing measures 50 by 23 feet like a large sail, is rotated into position to capture maximum sun- and wind-generated energy. The vessels can reach speeds of 10 to 13 knots, the same maximum speed as conventional ferries.