A tech startup on a mission to make modern commercial and housing estates energy neutral has outfitted the headquarters of a Dutch bank with the world's first commercial, fully transparent solar-power-generating windows. The windows have solar cells installed in the edges at a specific angle that allows the incoming solar light to be efficiently transformed into electricity. "Large commercial estates consume a lot of energy," said Ferdinand Grapperhaus, co-founder and CEO of the startup, called Physee.