No doubt the "energy clusters" name will sell far more product than would, Frosted Flakes with "Sugar Clusters", but given the cereal, at more than 4 teaspoons of added sugar per cup, contains more of the stuff cup per cup than Froot Loops and regular Frosted Flakes, no doubt it'd have been a far more honest descriptor.
Consider this further proof that the word "energy", is used by the food industry, as a health-washed euphemism for "sugar".