"<a href=""https://www.youtube.com/watch?v=zJt8yzR2aoY&amp;t=1m00s"">1:00</a>"," Just teleport 1 block at a time then since were presuming instantaneous relocation it's not any different in "speed" to do so.<br><a href=""https://www.youtube.com/watch?v=zJt8yzR2aoY&amp;t=3m00s"">3:00</a>", It would have to have infinite mass to generate infinite energy Tom since its still only going to ever fall at terminal velocity. It's certainly free*, and won't stop generating it as the portals are maintained but that's hardly infinite isn't it what with the universe casually meandering towards total entropy?