First I read it on slashdot and thought, "Surely they got the quote wrong."
So I went to Purdue's website and found the claim in the very words quoted on slashdot.
The idea of an electrical generator running off trash is great. I'd even settle for one that produces 90 percent of the energy it consumes. If we have a machine that produces 90 percent more energy than it consumes, we have a way of getting free energy and it's time to rewrite all the text books cause it sounds like Purdue has found a way to reverse entropy.
Commenters on slashdot hypothesize that this statement means that the electrical energy produced is equivalent to 1.9 times the energy injected into the system at the beginning in the form of diesel fuel. But the way it's stated in the original news release does sound like a violation of the second law. I like that interpretation better.