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Modifies the Energy cost of Warframe abilities. The minimum Energy cost is 1/4 of the Base value.
—In-game Description

Ability Efficiency linearly affects the energy cost of Warframe abilities. All Warframes have a base Ability Efficiency of 100%; Ability Efficiency over 100% indicates a reduction of ability cost while Ability Efficiency below 100% indicates an increase in ability cost. The Arsenal will not display an Ability Efficiency above 175% because abilities cannot consume less than 25% of their base costs.


When accounting for ability efficiency, ability energy costs can be calculated:

Channeled abilities drain energy at a specified rate. Ability Efficiency affects the energy drained at each tick as expected, but because Ability Duration affects the amount of time between these ticks, the formula for effective Ability Efficiency for channeled abilities is as follows:

In the case of Ability Duration under 100%, Ability Efficiency above 175% is also taken into account, even though not depicted in the Upgrade-Menu. The final drain still cannot go below 25% of its base value. (See the graph on the right for examples.)

The in-game energy bar display is rounded down to the nearest whole number, but the costs of the abilities are not. This results in the discrepancies in the apparent cost of abilities with Ability Efficiency mods. For example, an ability with 25 energy base cost will cost 17.5 energy with maxed Streamline (+30%). If this ability is used multiple times in a row, it will appear to cost 18 energy, then 17 energy, then 18 energy, then 17 energy and so on.

Energy Drain for Toggled Abilities[]

Some abilities are toggled on and last until the user turns them off or runs out of energy, such as HildrynIcon272.png Hildryn's Haven130xDark.png Haven or ChromaIcon272.png Chroma's SpectralScream130xDark.png Spectral Scream. Energy drain for these toggled abilities depends on both Ability Efficiency as well as Ability Duration. See the related section for a full explanation.

Other Behavior[]

Some Warframe abilities do not cost energy to cast, thus ability efficiency has a unique effect on these abilities:

BloodlettingModx256.png Bloodletting130xWhite.png
Garuda sacrifices her health to generate energy and clear Status Effects.
Efficiency:18 / 22 / 30 / 40 % (energy gain)
Misc:-50% (health deducted)
100% (status cleanse)
2 HP (minimum health threshold)

TransmutationProbeModx256.png TransmutationProbe130xWhite.png
10 s
Transmutation Probe
Launch a probe that converts Health and Energy Orbs into Universal Orbs that provide both, and ammo pickups into Universal Ammo Pickups. The probe shocks enemies in close proximity. Each electrocuted foe reduces other ability cooldowns by one and a half second. Hold to imbue the next ability cast with DmgElectricitySmall64.png Electricity damage.
Strength:100 / 150 / 200 / 250 /s (DmgElectricitySmall64.png Electricity damage per second)
100 / 150 / 200 / 250 /s (imbued elemental damage per second)
Range:3 / 4 / 5 / 6 m
Efficiency:1.5 s (Cooldown Reduction per enemy shocked)
Misc:15 m/s (probe speed)
3 s (probe duration)
DmgElectricitySmall64.png Electricity and imbued elemental status proc per second
0.5 s (halt delay)
25 HP/EP (Universal Orb restore)
10 % (Universal Ammo restore)


Mod TT 20px.png Streamline, Mod TT 20px.png Fleeting Expertise, Mod TT 20px.png Blind Rage, the Arcane Enhancement PaxBolt64x.png Pax Bolt, and the positive Ability Efficiency Arcane Helmets stack additively. Stacking with Trinity Meridian Helmet or Ash Scorpion Helmet does not appear to follow this formula; this suggests stacking is different when you have a helmet that reduces Ability Efficiency.


Mod TT 20px.png Fleeting Expertise, Mod TT 20px.png Streamline, Mod TT 20px.png Boreal's Hatred, Mod TT 20px.png System Reroute and Mod TT 20px.png Necramech Streamline reduce ability costs linearly based on the percentage shown on the mod card. Mod TT 20px.png Blind Rage, instead, increases ability costs.


PaxBolt64x.png Pax Bolt is currently the only Arcane Enhancement that affects Ability Efficiency.

Arcane Helmets[]

Arcane Helmets also reduce (or increase) ability costs linearly based on the percentage shown on the helmet. The following helmets affect Ability Efficiency:

See also[]