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Prepositions with nouns

'On stream' vs. 'of stream'

On stream appears in technical expressions such as bring on stream. Of stream is not a standard fixed expression.

Quick answer

Which form is correct?

On stream is used in technical and industrial English to mean operating or active. Of stream is generally not idiomatic as a fixed expression.

The new plant came on stream in July.
Several generators were brought on stream after repairs.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
come on stream

Starting operation

This technical expression means that equipment or systems begin operating.

The refinery will come on stream next year.
New servers came on stream overnight.
2
bring on stream

Activating something

Use bring on stream when people cause a system or facility to begin operating.

The company plans to bring on stream two new wells.
Engineers worked quickly to bring on stream the backup network.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
on stream
The facility is now on stream.
operating or active in technical usage
of stream
the flow of a stream
of belongs to another noun phrase and is not a fixed expression meaning operational
in stream
fish in the stream
in shows physical location
off-stream
off-stream storage
a different adjective meaning separate from the main flow

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using 'of stream' to mean operational

English does not use of stream with the meaning 'active' or 'working.'

✕ The system is of stream. ✓ The system is on stream.

Confusing location and status

On stream is technical and metaphorical, not physical location.

✕ The boat is on stream. ✓ The boat is in the stream.

Quick practice

Choose the expression that matches the intended meaning.

1. The new power unit came ___ stream last month.
2. Engineers brought the backup server ___ stream.
3. We walked beside the water ___ the stream.

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Frequently asked questions

Is 'on stream' formal English?

It is mainly technical or industrial English used in energy, engineering, and computing.

Can 'of stream' ever be correct?

Yes, when of simply links nouns, such as 'the sound of stream water,' but not as a fixed phrase.

Does 'on stream' mean online?

In some technical contexts it can mean fully operational or connected.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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