When an ambitious young physicist gets hold of old documents written by Nikola Tesla in Croatia, he finds Tesla’s plans to provide everyone in the world with energy obtained from merely particles in the air. He decides to travel to the US to learn more, but he soon understands that there are a lot of people who wants to stop his hunt for the free energy.

I'm not sure if the detail about Nikola Tesla (and Croatia) will help sell the concept. If I hadn't seen THE PRESTIGE, it probably wouldn't have rung a bell for me. The detail about the plans is surely over the top.

Tor (in the earlier comment) has effectively re-written the logline extremely well. However, he didn't get "evading the Government of two nations" from the original logline... It is still implicit that the governments don't like the invention of free energy. Perhaps this should be made explicit in the logline?

Does the physicist go through a psychological, transformational journey? It would be great to find a metaphor connecting physics and this story arc - like BREAKING BAD'S Walter White draws the parallel between chemistry and 'change' in the first episode.

"Discovering Nikola Telsa's blueprints for free energy, an ambitious physicist must stay alive long enough to develop a prototype while evading the Government of two nations."

Hope this helps. :D