eh. Energy combo's well with a lot of the secondary sets. As a corruptor set, it's not really the best as it lacks any form of Damage over Time components, so scourging generally isn't as effective as other sets. Anyways:
It goes well with sonic for the -resists.
It goes well with therm-rad for the -resists, -defenses, and heals
It goes well with Cold Dom for the enemy slow down and debuff
It goes well with.. it's actually easier to tell you what is NOT a good combo.
Energy / Traps generally doesn't work since most traps are stationary: Caltrops, Acid Mortar, Poison Mortar, Trip Mine, and Time Bomb. Unless you get really good at working your positional knockback powers and have the patience to knock enemies INTO your traps, something that probably won't happen very often if you like to team, you'll be spending most of the time setting up traps that are pretty much going to be usless.
Energy / Kin generally doesn't well either, since several of the kin buffs / debuffs generally rely on you to be within melee range of an opponent: transfusion, transference, Fulcrum Shift. Again, you could play around it, making sure that you shift targets and work your knockback control so that you aren't sending enemies flying away as you desperatly need a shot of heal or endurance.
Energy / Trick Arrow generally doesn't work that great too, since like Traps, some of the debuffs are positional. There's nothing like sweeping an entire mob off your lit Oil Slick, or knocking an enemy out of the range of your Distruption Arrow.
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Many players may also tell you skip Energy / Storm... mostly as this combination is generally referred to as SHEER AND UTTER CHAOS.
If you like to solo though... hehehe... this is one wild combination. There are few things as sweet as running towards a mob trigginger Freezing Rain, Thunder Clap, and lightning storm as you get in the middle... then NOVA!!!!
Enemies that were NOT slaughtered will likely be stunned, and any that try to approach you will be knocked away by the Lightning Storm, giving you time to recover.
I actually like Energy/Kinetics. I have one at 28 now and while it does take some getting used to, it's not too bad. I wanted to try something with Energy/ but knew that groups don't care for it very much but everyone like a /kin in the group so I figured I'd still get invites =)
There is a learning curve and je_saist is right about needing to manage the kb. It is annoying to try and throw your heal as you accidentally knock the mob out of range. I don't know how it will be when he makes it to the higher levels but for now, he's been pretty entertaining.
STORM. Seriously. Storm already has tons of knockback effects, so the knockback from energy will pale by comparison. This combo boasts tons of soft control in the form of knockback, as well as crippling debuffs.
As others have pointed out, this combo is very chaotic, but tons of fun and quite effective.
any good ideas for a secondary with energy blast ?