Welcome to the ITER, the world’s first International Thermonuclear Experimental Reactor. Or at least it will be, once completed. Directors Mila Aung-Thwin and Van Royko are charged with the very tall task of trying to explain how nuclear fusion can offer a clean source of energy for the future. Backed by the funding of several companies, it is a dream that will take several lifetimes to complete.

Let There Be Light attempts to explain how it works and why it needs to work using several testimonies, animations, charts and every tool at its disposal. We’re also shown the many small advancements in the past that made the idea of nuclear fusion desirable and, hopefully in the near future, attainable.

As explanation follows explanation, the narrative has its ups and downs. There are crystal clear explanations, there’s analogies and then there’s the science. Some of these work better than others, which is why the movie relies at least initially in your level of curiosity to move forward without leaving you behind.

Recommended for the interested. You won’t have to be a nuclear physicist to understand, but it does require your focus. Casual audiences might want to look for something more spiced up. However, even if you have a passing interest on the subject or are willing to consider that the future no longer belongs to carbon-based fuel, coal or gas, you should definitely invest some time in taking a look.

That will do for now.