The "Power Lines" quest in Control Resonant requires players to navigate subway stations and correctly position tuning forks to reroute power. This quest becomes available after completing "Arish's Briefing," where Arish tasks you with a high-power requirement for fighting resonants, with maintenance teams having gone missing.
The "Power Lines" quest involves completing four main objectives: Reroute Perimeter Station Reroute East Park Station Reroute Factory Station Reroute the Vanished Station
While the first three stations can be rerouted in any order, the Vanished Station is accessed after completing the others.
Rerouting Perimeter Station
Perimeter Station is located southeast of the Field Office. After defeating enemies guarding the entrance, proceed down the stairs. On the subway platform, you will find a tuning fork contraption and notes that explain the calibration process. For this station, three calibration units must be placed: one closest to the tuning device and two farthest.
The first two units are found nearby. Head north up the stairs for the first unit. For the second, drop onto the train tracks and go south into a moldy area. The third unit requires obtaining a power core. Locate an uncharged power core on the northern side of the tracks. Take a charged power core from the southern stairs and quickly transport it to the uncharged one on the northern tracks. This will open a door containing the final calibration unit. Place this unit in the farthest available spot, which is the door that just opened. Activate the tuning device to complete the station.
Rerouting East Park Station
East Park Station is in the southern part of the Central zone, west of a gas station. After clearing the initial enemies, you'll reach an intersection. A calibration unit is visible behind a gate on the left, and a free unit is on the right. Take the free unit downstairs. After clearing mold and reading notes, place the unit on the floor. To proceed, activate the tuning device to teleport. Place the two available tuning devices on the platform into any squares, then use the tuning device three times. On the third use, you will teleport into a room with the calibration unit. Activate the electrical box with the red light to open the gate, retrieve the unit, and place it in the final square on the platform. Activate the tuning device one last time to finish.
Rerouting Factory Station
Factory Station is northwest of the Patterned Factory. After defeating enemies, you'll find a calibration unit inside one of the stores. Place this unit at the bottom of the stairs. A note indicates that all calibration machines must be in a straight line. Two more calibration units are available: one on top of a subway car to the west and another behind the southern stairs. Place these two units in the squares between the first unit and the tuning device. Activate the tuning device to trigger a cutscene.
Rerouting the Vanished Station
After activating the tuning device at Factory Station, the exit will transform, and an intercom will reveal that Clarke has disappeared. Follow the left tracks south until you find Clarke's body and his ID badge. Continue until you reach the Vanished Station platform. Notes here explain that there are two platforms, A and B, each requiring two calibration units. Platform A must be activated first, and the tuning device will teleport you.
First, address Platform B. Use the tuning device to teleport to Platform B. A note indicates mold is attracted to electricity and has damaged cables. Another note explains floodlights accelerate mold growth. Locate a charged and an uncharged power core. Swap the charge to the uncharged core and use it to open a room containing a calibration unit and a health upgrade point. Bring this unit to Platform B. Then, break the mold near a metal door to reveal survivors, Dr. Florez, and two calibration units. Take one of these units and proceed through another metal door, opened by activating an electrical box with a red light, to reach Platform A. Place this unit by the stairs. Now, charge the power core on Platform A, then charge the power core on Platform B. This activates floodlights, causing mold to grow on the squares. This process also opens a gate at the north stairs, allowing access to the final calibration unit. Take this unit back to Platform A, break the mold, and place the unit in its square. Activate the tuning device on Platform A.
Next, return to Platform B. Turn off both power cores, then take their charges to the two uncharged cores upstairs. Retrieve the last calibration unit from the room with the survivors and bring it to Platform B. Do not break the mold on the cables, as it is powering the tuning device. Once the calibration units are in place on Platform B, destroy the mold on the sides of the platform covering the squares. Place the units into these squares and activate the tuning device. After defeating the enemies that appear, speak with Dr. Florez to complete the quest.