A power outage can be caused by several factors. The most likely reason for half of your house to be without power is because a breaker has tripped or blown. There are three possible causes:
• Overloaded circuits - If too much electricity is running through the same circuit, it could cause the breaker to trip.
• Short-circuits - A short-circuit means that wires have come in contact with each other and excess current flows through them, causing the breaker to trip.
• Ground faults - This occurs when an electrical current runs back into the ground instead of returning down its intended path and again causes the breaker to trip.
It is important to identify which circuit needs attention so you can restore power as quickly as possible.