I noticed this as well. By a strict reading of the rules, yes. Enervation can create wights.
You'd better be careful, however. If a PC can create undead with enervation at will, it makes the spell pretty useful in causing havoc.
A single wight can spawn hundreds of wights in a matter of minutes in a city of 1 HD NPCs. A wight can probably spawn another wight in 5 rounds or less in a populated area. This creates a pyramid with the number of wights doubling every 30 seconds. In five minutes, you can have over a thousand wights. In ten minutes, you could have over a million. Obviously, these numbers would be reduced because it would take longer for wights to find their targets, there would be some resistance, etc ... , but still, the numbers are staggering. A mid-level wizard that teleports into town, enervates a half dozen bums in different areas (the docks, the slums, etc ...) can teleport away and feel pretty secure in knowing that unless clerics can get to all of his starting points very quickly, he likely has destroyed that town.