ACT Fire & Rescue are on scene the Jenny Wren Childcare Centre, 18 Enderby Street, Mawson.
Firefighters were called to the centre following a power failure.
Due to the heat, 92 children have remained inside the building with crews monitoring their safety.
ACTEW is working to restore power.
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ACT Fire & Rescue has two units on scene and a commander.
The Emergency Triple Zero Call (000) was made at 11:32.