I don't want to make my first post longer than necessary, so here are some findings:
Basically we can sacrifice utility for power drains. I haven't listed it because it is dumb that I'm even considering it, but interrupts also cost power and could be used. Please don't.
I also hope that this isn't the intention behind this mechanic, but at the moment I think sacrificing utility is our best bet.
I'm looking forward to the ability lag 
Tempest
Code:
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cast Focused Fire
cast Jolt
cast Storm Shield
Dumps 30-40 power immedietly.
False Response every 30s for another 10 power if needed.
Paragon
Code:
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cast Shield of Will
cancelbuff Sweeping Blades
cast [notactive] Sweeping Blades
Dumps 10-20 power per two presses. Clunky, but can get the job done. Impacts DPS during use.
Warlord
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cast Battlefield Medic
cast Eye of the Storm
cast Sergeant's Order
cast General's Order
cast Forced March
Dumps 31-47 power immedielty. The last two probably are a bad idea, and Sergeant's Order depending on encounter as well.
If using a Riftblade-variant of warlord, Icy Burst can be used to dump power as well.
If atleast 4 into tempest, Offensive Blast could be used as a high cost ability.
Riftblade
Code:
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cast Stoneshield
Dumps 10 power immedietly.
Rift Travel would be another 5 power, but is clunky as hell and has a 45s CD. Not worth it imho.
Spam bursts and/or use AoE builders (Thunder Strike).
If really desperate, I'm with you! from Warchanter is the highest power cost builder 
Reaver
Code:
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cast Eye of the Storm
cast Crest of Entropy
cast Pestilence
cast @gtae cast Stumbling Morass
Dumps 38 power immedietly. Assuming warlord-variant.
Toggling Plague Bringer is another 11 power.
Champion
Code:
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cast Weapon Defense
cast Mark of Extermination
cast Eye of the Storm
cast Breaking Blow
Dumps 67-75 power on the next GCD. Uses an onGCD ability!
Inescapable can be used every 30s for 8 power if not needed.
Naturally drains power faster than other specs. BB by itself should be plenty.
Beastmaster
Code:
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cast Battlefield Medic
cast Eye of the Storm
Dumps 23 power immedietly.
Can use Icy to drain faster.
Naturally drains power faster than other specs. Shouldn't be too much of a problem.
I'll forgo the healers and tanks. Warchanter/Libchanter should be easy enough, Liberator probably is hard to drain fast without sacrificing a lot. Tanks, I don't know/care/etc. Probably sacrificing cooldowns isn't the best idea and the gain isn't the same as for DPS anyway, so I wouldn't really bother trying to use the proc.
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