When Locke switches on the lights, he comments to Ben, "You have electricity?"

I have been operating under the assumption that the Swan Station was generating all the power for the island and that was why Dharma had set up the fail-safe device to keep it running after "the incident."

Since the Swan Station is now destroyed, where's the Barracks electrical power coming from?

And the cool thing is, that it was almost a "throw-away" line. Ben answered with a joke. "There are two giant hamsters running on enormous metal wheels deep within the bowels of my secret underground lair."

So...another power source?

Is it listed in the Dharma Owners Manual that Sayidd found at the Flame Station?

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charlie98210
"Whoa!" she said. "Cry 'Havoc!' And let loose the dogs of war!"
And, like Banquo's ghost, they just won't go away.