I checked. This was the powertype list as of patch 5.0.5
Code:
0 - Mana (SPELL_POWER_MANA)
1 - Rage (SPELL_POWER_RAGE)
2 - Focus (SPELL_POWER_FOCUS)
3 - Energy (SPELL_POWER_ENERGY)
4 - Happiness (SPELL_POWER_HAPPINESS)
5 - Runes (SPELL_POWER_RUNES)
6 - Runic Power (SPELL_POWER_RUNIC_POWER)
7 - Soul Shards (SPELL_POWER_SOUL_SHARDS)
8 - Eclipse (SPELL_POWER_ECLIPSE)
9 - Holy Power (SPELL_POWER_HOLY_POWER)
10 - Alternate Power (SPELL_POWER_ALTERNATE_POWER)
11 - Dark Force (SPELL_POWER_DARK_FORCE)
12 - Light Force (SPELL_POWER_LIGHT_FORCE)
13 - Shadow Orbs (SPELL_POWER_SHADOW_ORBS)
14 - Burning Embers (SPELL_POWER_BURNING_EMBERS)
15 - Demonic Fury (SPELL_POWER_DEMONIC_FURY)
12 got replaced by SPELL_POWER_CHI in patch 5.1
But what the heck is DARK_FORCE? When does this get used?