A low-aspect fin (wide but not too deep) is required on this big yacht to minimize draft; otherwise the fin would project beneath the keel. High-aspect fins (narrow and deep) are more efficient, because of their longer leading edge, but not always practical.
Greenline Hybrid is a boatbuilder that uses hybrid diesel-electric propulsion systems and solar panels on the hardtop plus smart design to make the efficient use of the energy on the boat. The result in some models: silent operation, full-size residential appliances, and an overall pleasant experience on board.
See for yourself here. ▶