Nobody was injured. The cause of the fire was yet to be ascertained. An inquiry has been ordered into the incident.
Fire department said the blaze was reported at 3:20 AM and immediately 11 fire tenders rushed to the spot to douse the flame.
A CNG filling station at the depot also caught fire, the Fire department said.
"17 buses were gutted in the devastating fire," DTC Spokesperson R S Minhas told PTI.
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He said a three-member probe panel has been appointed to investigate the incident.
The other buses were immediately taken out of the depot.
A fire department official said the cause of the fire was yet to be ascertained. "We could douse the fire at around 5:15 AM," he said.