I'd never done that calculation, but that's about right; https://en.wikipedia.org/wiki/Barrel_of_oil_equivalent is 6 gigajoules:

    You have: 6 gigajoules / 10 years (8 hours/day)
    You want: W
     * 57.039776
     / 0.017531626

I think that from a moral point of view it's accurate to say that we ended slavery in general, or at least mostly ended it. Energy slaves made of barrels of oil or solar panels don't involve the same suffering and cruelty that human slavery does.

Energy slaves made of barrels of oil come with a lot of external costs that do impact living things though. I lived on the gulf coast when during and after the BP oil spill, countless animals suffered due to that oil spill.