A planned power outage is scheduled to take place in Monterey county sometime between 5 and 6:30 this morning. PG & E says the approximately 5 minute shut-off will allow workers to perform some needed maintenance at the Monterey substation. The 21,000 customers expected to be impacted are in parts of Carmel Valley, Monterey, Pebble Beach, Salinas, Pacific Grove, Del Rey Oaks, Seaside and Marina.