Seattle producing electricity from garbage (article)

The article below vaguely mentions that "Seattle has begun getting electricity from its own garbage and will soon get more":

Garbage power: Seattle touts renewable energy source

Is it just me or does this article suggest that we can convert garbage into electricity as in "the more garbage we produce, the more energy we have?" or "let's produce more garbage so that we can increase the share of energy we get from renewable sources?" Something about the way this article was written just doesn't sit right with me.

Also not mentioned is what percentage of the garbage is converted to electricity. Is it 100% of the garbage or 20%? Inquiring minds want to know.

Also would be interesting to know the amount of energy spent to move the garbage to the landfill location and the energy spent to transfer the electricity back to Seattle. But I suppose that is technical information that would be too much to ask.