Enercon systems are visually distinct from systems of other manufacturers. Their nacelles have been drop-shaped since 1995/1996. This unique design was developed by British architect Norman Foster, who also designed the dome of the Berlin Reichstag. In Germany and many other countries, the tower has coloured green rings above the foundation, which get brighter from bottom to top. On islands such as Borkum, the gradation is blue. The NCS grading is intended to better integrate the plant towers into the horizon. The rotor blades were the only ones on the market with blade tips similar to the winglets on aircraft.