The next step is to turn on the power.
The Power Lab is the fourth bus stop in Tranzit. To access the power lab, enter through the shed to build the power switch. You require three parts to build the switch all located within the power lab.
The parts required are
A power board
The power switch lever
A severed zombie hand
You can built the power switch here
Once the power is on "Him" will be appear from the middle of the power room. After a short while, Maxis will speak over an intercom. Richtofen will speak only to Samuel.