Since the only prerequiste this quest is the completion of the mainstoryquest "A Great New Nation", there shouldnt be any reason why hes not offering you that quest.

Few things I'd check:

1) Have you really completed the HW-Story, including "A Great New Nation"?
2) Are you looking for the questgiver in the right spot? (Hinterlands at X: 22, Y: 18.8)
3) Is it really that aether current that you're missing? Check if you've completed the quest (and any other that gives you aether currents)! Maybe you've accepted it at somepoint, but havent turned it in yet/didnt finish it?

If you're absolutly certain that you've not accepted/done the quest, but should have it unlocked, I'd try filing a bug-report, so that it can be looked into.
Afaik there shouldnt be any reason for the NPC not to give you the quest, once you've finished "A Great New Nation".