This is part of the Electricity Tech Tree. It can be found on an Abandoned Tablet when exploring abandoned bases in the world. It is after the transformer technology upgrade as one of the requirements for the third branch.
The branch is required to unlock the following:
- Industrial Energy Converters, which allows the storage of more energy and unlocks the Transformer Upgrade and the Wind Turbine.
- More Efficient panels I upgrade
It is a prerequisite for: