No fuel, no emissions

As the Float bobs on the ocean waves, the Glider portion below the water is pulled up and down. The six fins, seen here, on either side of the Float, move independently with the tugging of the tether, and the up and down motion provides the forward thrust to propel the Wave Glider vessel forward.

Typically the speed averages around 1.5 to 2 knots, but even in calm, glassy waters, the device will move at about half a knot.