TC Energy says Keystone pipeline returns to service
Canadian pipeline operator TC Energy Corp said on Thursday it had completed a controlled restart of its Keystone crude oil pipeline to Cushing, Oklahoma, safely returning the pipeline to service after a 21 day outage.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction: TC Energy says Keystone pipeline returns to service

### Response: Canadian pipeline operator TC Energy Corp said on Thursday it had completed a controlled restart of its Keystone crude oil pipeline to Cushing, Oklahoma, safely returning the pipeline to service after a 21 day outage.