How to define planet robot energy cost multiplier like Aquilo?

[nbcss]

As title says, I feel like there is a surface property of robot energy cost multiplier somewhere but I cannot find it in document nor factorio-data GitHub. Is it a value hardcoded in Aquilo implementation?

[eugenekay]

Previously

There is no stat for robot energy usage, it's (gravity/pressure) * 100

[nbcss]

Previously

There is no stat for robot energy usage, it's (gravity/pressure) * 100

Thanks!