Alice A. Bailey (and DK) appear to have had a very positive view on the possibilities of humanity using atomic energy for good. Joseph J. Dewey , author and longtime student of the AAB/DK writings, pointed out that:
“In A Treatise on Cosmic Fire Page 907 (Published 1925) he [Djwhal Khul] predicted the discovery of atomic energy and then after the first atomic bomb went off he stated that this was a source of power that will eventually liberate humanity.” -Joseph J. Dewey, Djwhal Khul Predictions
You can find the specific quote below starting with “On the physical plane, the great scientific discovery, …”
“From these writings it is obvious that the Hierarchy was hopeful that humankind would perfect atomic technology, yet despite this it is interesting that many who see themselves as enlightened are totally against this, the safest and most environmentally friendly source of energy in the free world. -Joseph J. Dewey, The Nuclear Solution
Below are all of the places I could find that mention “atomic energy” in the AAB/DK writings.