Not correct. from the exact same wikipedia article, and only a couple lines below what I talked about earlier:
The ship’s power comes from six medium speed marine diesel generating sets: three 16-cylinder Wärtsilä 16V46D common rail engines producing 18,860 kilowatts (25,290 hp) each and three similar 12-cylinder Wärtsilä 12V46 engines producing 13,860 kilowatts (18,590 hp) each. The fuel consumption of the main engines at full power is 1,377 US gallons (5,210 l; 1,147 imp gal) of fuel oil per engine per hour for the 16-cylinder engines and 1,033 US gallons (3,910 l; 860 imp gal) per engine per hour for the 12-cylinder engines. The total output of these prime movers, some 97,020 kilowatts (130,110 hp), is converted to electricity, used in hotel power for operation of the lights, elevators, electronics, galleys, water treatment plant, and all of the other systems used on the operation of the vessel, as well as propulsion. Propulsion is provided by three 20,000-kilowatt (26,800 hp) Azipods, ABB’s brand of electric azimuth thrusters. These pods, suspended under the stern, contain electric motors driving 20-foot (6 m) propellers. Because they are rotatable, no rudders are needed to steer the ship. Docking is assisted by four 5,500-kilowatt (7,380 hp) transverse bow thrusters.
Additional power comes from solar panels fitted by BAM Energy Group, which provide energy for lighting in the promenade and central park areas. The installation cost US$750,000 and covers 1,950 square metres (21,000 sq ft) on deck 19.
3/4 of a million bucks in solar array in addition to the 7 thousand gallons of diesel per hour. Not to mention the ~1/2 acre dedicated to the solar array.
Yeah, that math doesn’t work out. PV Solar doesn’t pencil out for land vehicles, it doesn’t pencil out for water propulsion either. You’re not going to get 97 MW of power out of the PV solar arrays that will fit on this area of floating platform. Even if you scale down power consumption by a factor of ten for everything except propulsion (down to ~3MW for all other items), you still need something other than PV Solar to provide the 60,000 kW for propulsion.
This is a small city with 6,000 people entirely dependent upon artificial systems providing life support. Typical “off-grid” power budget calculations figure on something like 8kWh/day for a minimalist family survival. Multiply that by half the people on the ship just for a cocktail-napkin quality of SWAG and you get 24000 kWh/day or 24 MWh/day. Call it a family of 4 on that 8kWh/day budget. 6000/4*8kWh/day is 12000 kWh/day or 12 MWh/day. PV Solar isn’t going to generate that much power per day even if every bit of the ship were covered in PV arrays with no room left for anything else.
All of this before you even get to propulsion. Solar is a supplement, not a replacement for traditional power generation.