Short Circuit is your bread and butter End Drain. 3 slotted with End Modifiers it drains about half a mobs endurance. 3 Recharges and hasten ((EDIT: Thats stupid. 1 recharge and 2 accuracy. You -have to hit- with it. My early morning stupidity)) and you'll have it back up reasonably fast enough to completely drain them. It also prevents end regen for 10 secs, which is pretty important. Transfusion is second for end drain, taking about 10 or 15 end from them, giving you that last little bit they rega (along with the - Healing to them and +healing to team)
Transference is next - and is the true - 'Sap' of the power set combo. Its where you get lots of end back, in the same manner as Transfusion gives life. Everyone loves Transference. But its single target, unlike Short Circuit which hits up to 16. But, hit the Boss/AV with Transference, then short circuit, followed by a Transfusion on the Boss and he'll have very little Endurance left.
the 'Sap' part of Electric is barely noticeable - Charged Bolts and Lightning Bolt only return about 3 or 4 end un slotted. Its better to slot for Damage and Accuracy, and just enjoy the little bit back. Plus, with Vigilance you rarely have an end problem unless you are running a lot of power pool toggles.
I love my Kin Electric. your not Sapping just End, but life (Transfusion) Damage (Siphon Power/Fulcrum Shift), Speed/Recharge (Siphon Speed)
Repel: Can be very fun. The reason most Kin/Ele don't take it is we're sometimes (laughably sometimes) referred to as Scrapenders. We need to be close for our heals. We need to be close for Short Circuit. We need to be close for transference. We need to be close. And if you have a melee heavy team you have to be close for Siphon and Fulcrum. Usually its best to Siphon/Fuclrum with the biggest number of damage dealers are, then rush in to short circuit ect. And just stay in melee. Thats why I always have Hover, but don't go any other travel powers (who needs em? :P)
Repel doesn't get used very much because of that fact. Situationally or Soloing you're right, its pretty great. Group wise, it has a lot of downfalls so its regulated to the back when power choices are scarce. Leveling a new Kin/Electric right now, I find that with Fitness being inherent, and not needing a travel power thanks to Ninja Run (Plus spring+Siphon Speed+Inertia Redux) i don't have to struggle to find room to take powers. I dont take Increase Density early (it's rarely useful or remembered) and while i could take Lightning Ball, i find i rarely have time in a group to hit most of my attacks with Recharge anyways due to trying to keep Transfusion and Siphon Power going constantly, along with Short Circuit.
Also, note: two short circuits from 2 electric blast toons? = Drained Mobs in the first 5 seconds of battle. Sooooo awesome. If you have a friend run with them having electric blast on a toon too. totaly awesome.
) and i only have some low level toons. But Id love to get into a group to have people to play with more often. I picked Freedom cause its always been at the yellow status (as opposed to playing on Pinnacle a bit which is a -ghost town- ) And would like to use that to my advantage.