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Even though neither the alternator or electric accessory drives would reach a 100% efficiency rate, they're still favored compared to the thermal efficiency of an ICE which hardly surpasses 40%. And nowadays the so-called "intelligent" alternators which are meant to start operating once the battery reaches a low charge or during decelerations as some sort of regenerative braking also tend to increase overall efficiency.
On a sidenote, it's interesting to notice how many trucks still resort to hydraulic power for implements thru PTOs that may be mounted either at the engine or at the transmission, even though some newer ones are now resorting to electric drive for the implements as it doesn't require the engine to be kept at high idle and thus decreasing noise while operating at night.
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