Diesel-electric propulsion for a modern fast attack craft

Would diesel-electric propulsion suit a modern Dog boat, and below what ship size would hybrid power stop making sense?

It can help with quiet running and immediate power, but the size threshold depends on the mission, acoustic requirements, and machinery arrangement.

For a modern Dog boat, diesel-electric propulsion is attractive when quiet anti-submarine work matters, particularly with a period of battery running. Batteries can also supply power immediately for sensors, weapons, or movement before generators increase output. On larger ships, integrated generation and machinery distributed around the hull can add resilience after damage. The Queen Elizabeth class is used as the example of separated diesel and gas-turbine generators. Crew accommodation is suggested as one rough threshold for considering hybrid machinery, although a missile boat's acoustic requirements could justify it at smaller sizes. Separate elements of the plant can also allow upgrades in stages. No universal minimum hull size is established.