1.   But SRP and Tucson Electric Power officials both acknowledged the possibility of brief blackouts if there are unexpected events.

2.   Crews can investigate the source of such brief blackouts, such as an overgrown tree knocking two power lines together, to prevent bigger problems.

3.   The hot weather, mixed with dozens of power generators closed for maintenance, caused brief blackouts in communities statewide, including Beverly Hills, Santa Monica and Oxnard.

4.   But the exodus of office workers to the suburbs or other cities with reliable power has pushed down energy demand and there have been only brief blackouts since Monday.

5.   Last summer, brief blackouts occurred in parts of the country because utilities ran short of generating capacity and there were breakdowns in the nationwide power grid.

6.   Last summer, brief blackouts occurred in parts of the country because utilities ran short of generating capacity, and there were breakdowns in the nationwide power grid.

7.   There were a few brief blackouts, but nothing like the six-hour shutdowns that have trapped people in elevators and turned downtown office buildings into high-rise saunas.

8.   While most schools handled the brief blackouts well, State school Superintendent Delaine Eastin worries longer outages will force more to send students home.