Like most modern cruise ships, Viking Sky has a diesel-electric propulsion system where an integrated power plant provides electricity for all onboard consumers ranging from the vessel's twin propellers to hotel functions such as lighting, air conditioning and electrical sockets in the passenger cabins. Her two interconnected but physically separated high-voltage switchboards are supplied by four alternators driven by MAN 32/44CR series medium-speed diesel engines. In accordance with the Safe Return to Port requirements for passenger ships, the power plant is split to two engine rooms separated by watertight and fireproof bulkheads. Each engine room houses one 9-cylinder 9L32/44CR engine rated at 5,040 kW (6,760 hp) and one 12-cylinder 12V32/44CR engine producing 6,720 kW (9,010 hp) each, a so-called "father and son" configuration. In addition, Viking Sky has a single 1,390 kW (1,860 hp) Isotta Fraschini V1712T3 emergency diesel generator.
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