Summary: Engine 20 responded to a carbon monoxide (CO) alarm at Rock Canyon High School, located at 5810 McArthur Ranch Road, Arapahoe County, Colorado. Upon arrival, no sick parties were reported. The crew investigated and found all systems normal. Communication with the alarm company was attempted to confirm the alarm status. During the incident, a power outage occurred at the school, which was reported to dispatch. The situation was monitored and resolved without any reported injuries or hazardous findings.