Final answer:
The essential component of an emergency plan for a ventilator-dependent child going home is to notify the power company that the child requires life-sustaining equipment that is dependent on electricity.
Step-by-step explanation:
The most essential component of an emergency plan for a ventilator-dependent child being discharged home is notifying the power company that the child is on life support. This action ensures that the power company is aware of the critical need for electricity at the home, and can prioritize services or provide rapid response in case of a power outage. Moreover, power companies often have special programs for households with life-sustaining equipment, providing them with additional safeguards. Having backup systems, such as a backup generator and arrangements for alternative heating and cooling sources is also important, along with notifying emergency services of the child's condition to prepare them for potential emergency calls from the residence. Designating an emergency shelter is more of a contingency plan and, while important, does not tie directly into the immediate need for maintaining the function of life support systems as does notifying the power company.