Multiple attacks

[Qelan]

In a superhero style campaign if a character has 2 Energy Blast purchaced in 2 seperate EC slots could he choose to fire both EBs off as 1 attack against a single target? From what I can tell from the rules it seems this is possible. Second if it is true would this work the same with a HKA and would your base str apply to both HKAs?

[Steve Long]

Per 5E 204, a character cannot combine two slots from the same EC into a multiple-Power attack.