Definitely. We have only just begun in the last 300 years to understand and control energy, Imagine where we will be in 3,000 years!
There are still atoms being added onto the periodic table, which could provide more energy solutions. The Large Hadron Collider is a huge experiment which aims to answer a few questions, it collides 2 atoms close to the speed of light. These collisions may provide alot of energy and if we can figure that out we maybe able to create alot of power using only 2 atoms!
Check this out – https://www.youtube.com/watch?v=bTHzB4h0po4