The Cold Fusion could give a mankind independence from the energy resources. The mobile phones and laptops would no longer need recharging and foremost the cars would no longer need refueling.
However the Lord that is in possession of this and other advanced technologies does not want to share it now. After years of oppression and marginalization of his person he does not believe that the mankind has grow up to such ground-breaking advance.
In addition the Cold Fusion question is a geopolitical question on the future of his country – the Polish Question. The Russians would do everything to block him from giving this technology. The invasion on Poland is a real possibility.