e-cat

''1 MW E-Cat Cold Fusion Device Test Successful
On October 28, 2011, Andrea Rossi demonstrated his 1 megawatt E-Cat system to his first customer, who had engineers/scientists on hand to test/validate its performance. Due to a glitch, it provided 479 kW of continuous power for 5.5 hours during the self-sustained mode.'' [source]

There were some issues, so it couldn't be run at full power in self-looped mode, but what it did do was plenty impressive.

It ran for 5.5 hours producing 479 kW, while in self-looped mode. That means no substantial external energy was required to make it run, because it kept itself running, even while producing an excess of nearly half a megawatt. Rossi explained the reasons for this in the presentation he gave, which I videotaped and will be posting later.

I hope I will be able to buy one soon ;)