Not sure how relevant this is, but I have a few feats regarding Energy Weapons and Power Armor. First, I want to note the original official descriptions of Power Armor provided by Interplay:
"The T-51b Powered Infantry Armor is designed with the latest passive defense features for both civilian and military disturbances. The back-mounted TX-28 MicroFusion Pack generates 60,000 Watts to power the HiFlo hydraulic systems built into the frame of the suit. Made of the latest poly-laminate composite, the T-51b shell is lightweight and capable of absorbing over 2,500 Joules of kinetic impact. The 10 micron silver ablative coating can reflect laser and radiation emissions without damage to the composite subsurface." - Fallout 1, ZAX computer at WestTek research facility.
Please note that 2.5 kilojoule statement is referring to the lightweight outer shell, not the entirety of the armor, which is quite heavy. Additionally, the file says
over 2,500 joules, making it a lower end estimate of the outer shell's durability, not a maximum. The armor is also custom fitted to maximize mobility:
"Cumbersome? Not in the least. The sacred armor is so finely constructed to such exacting specifications that it feels like an extension of the blessed one's own body. It increases one's strength many times over and helps you resist the effects of radiation so that you may more effectively serve the brotherhood. I would feel diminished without my holy armor." - Fallout 1, Paladin Darrel.
On to feats.
^ This is a scripted sequence from
Fallout: New Vegas. In it, we see the Van Graff family execute a man with a laser rifle, which instantly disintegrates him into a pile of ash.
^ In this scripted sequence from Fallout 4, the same model of laser does essentially nothing to Power Armor at close range (the first weapon demonstrated, the laser rifle, is how the event is actually shown in-game).
^ In another scripted sequence, Paladin Danse is positioned directly under a large rocket engine, which disintegrates his Synth attackers (who had him under heavy laserfire for several minutes prior - the laser beams can be seen deflecting off of his armor) and heats his armor to a deep red. Despite this, both Danse and his armor are not noticeably affected. This feat would involve not only heat, but a massive amount of pressure, sufficient to begin carrying a rocket into space.
^ This is a fight from Fallout 1: Super Mutants vs the Vault Dweller and all possible companions (this is not a mod). When the fight begins, the Vault Dweller has 101 hit points. Katja has 39, Dogmeat and Ian both have 50, and Tycho has 60. Thanks to the Power Armor's resistance, the Vault Dweller is able to resist far more damage than his allies, even considering his higher Hp. Each of the companions is hopelessly gunned down like cannon fodder while the Vault Dweller tanks multiple minigun bursts with only minimal damage.
When only one Super Mutant is left, out of ammo, the Vault Dweller deliberately puts his gun aside to try and beat him to death with his fists, taking zero damage from the Super Mutant's punches aside from one lucky critical, which only did 7 damage.
Here we see the Vault Dweller in Power armor using a bazooka on a pack of Radcorpions literally less than a meter from him. He is damaged in the ensuing blast (going from 103 hit points to 95), but the Radscorpions are simply obliterated.