There have been a concerted effort by the powers that be to withhold free energy generating devices to maintain their grip on power and wealth for many decades starting from as far back as Nicolai Tesla's era.
What is inevitable is that these free energy devices must eventually come out because the longer it is delayed the more damage is done to the very planet that we need for existence by our continued reliance on fossil fuel for energy.

http://www.cheniere.org/

http://www.pureenergysystems.com/events/conferences/2004/NewEnergyMovement/6900047_StevenGreer_QA/index.html