 It features two Helix wind 5-kilowatt wind turbines, a 20 kilowatt solar array, LEED certified carpets, LED lighting, and an interior made partly of recycled and sustainable materials.The "Alcatraz Clipper Hybrid" was originally constructed in the early 1970s as a vessel to serve Catalina Island.Hornblower Cruises subsidiary Alcatraz Cruises acquired the vessel in 2008 and retrofitted it to have Tier II engines with a Selective Catalytic Reduction (SCR) units.