Passed by Brisbane's Kurilpa Bridge the other evening. Apart from being a pedestrian and cyclist bridge, it uses LED lights powered by solar power.
According to Energy Matters the bridge has 84 solar panels. Each day they produce 100kWh of energy (presumably stored in batteries). When the bridge is in fully lit mode (as above) the solar system provides 75% of the energy. But it most lighting configurations, this increases to 100%, with the excess energy fed back into the grid.