be/come on stream

come on stream

or

go on stream

mainly BRITISH
COMMON If a plan or a project comes on stream or goes on stream, it begins to operate fully. The airport's authorities say they expect new destinations to come on stream in the course of this summer. The project was expected to go on stream by September this year. Note: You can also say that something is on stream. The facility has been on stream since the early part of the year.
See also: come, on, stream

be/come on ˈstream

(of a factory, machine etc.) be/start working or operating: The new printing machines come on stream in March.We’re waiting for the new software to come on stream; it will make our jobs much easier.
See also: come, on, stream