Whether or not your home security system will work during a power outage depends on the type of system you have. Home security systems that use landline monitoring will continue to communicate with the monitoring center during a power outage. Systems that use cellular monitoring are typically unaffected during a power outage as long as your battery is functioning. Security systems that need the Internet to operate will not work during a power outage. Without an Internet connection, the security system won’t communicate with the monitoring center until power is restored.