I don't know the answer to your question, but the DoE does a lot more than just energy. In addition to overseeing energy policy, they oversee the R&D of nuclear weapons and the nuclear weapons program, they oversee the National Laboratories which does a lot of research and development in the areas of technology, health, physics, climate/environment and energy, they started the Human Genome Project, etc.

Here's their overview of some of the stuff their National Laboratories have done: https://www.energy.gov/articles/75-breakthroughs-americas-na...

It sounds like they need to rename themselves. Perhaps "Department of Science"?

There's a reason why DoE's used as the "villain" agency in Stranger Things, enough so that DoE commented[1] on it.

1: https://www.energy.gov/articles/what-stranger-things-didnt-g...