Between the pillars of a long-expanse bridge, a multitude of turbines capture wind energy from the faster-moving high-altitude currents. In addition, the (currently theoretical) road is paved with a “dense network of solar cells,” covered with a transparent and highly-resistant plastic, increasing the design’s energy production.
A solar park is also incorporated into the plan. It is estimated that the bridge will generate 40 million kWh per year.
Link - via Geeks Are Sexy