Ability Efficiency

Power Efficiency is a linear reduction in the energy cost of Warframe abilites.

How to fill out a cost progression table row:

Using a max level Warframe and Flow module, and making sure to not have the Energy Siphon artifact equipped, collect energy until you reach your maximum amount of energy, then continuously use the same ability, recording your remaining energy after each time. Subtract to find the difference between each use.

Streamline General cost table with Streamline at 30%

Essence Loki Helmet (Essence) Provides a 15% bonus to Power Efficiency.

Scorpion Ash Helmet (Scorpion) Reduces Power Efficiency by 5%.

Streamline stacking with Essence

Streamline stacking with Scorpion