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The phrase "are operational since" is correct and usable in written English.
It can be used to indicate that something has been functioning or in effect from a specific point in time.
Example: "The new systems are operational since last month, improving our efficiency significantly."
Alternatives: "have been operational since" or "are in operation since".
Exact(1)
KIT has designed, constructed and tested the HTS current leads for W7-X, which are operational since 2015, and presently manufactures and tests also the HTS current leads for JT-60SA.
Similar(59)
The £16m station, on the Southend Victoria to London line, has been operational since mid-July and is run by airport operator The Stobart Group.
The greenhouse has been operational since 2002.
The device, manufactured by Siemens & Hyusung, has been operational since Oct. 2002.
It has the longest history of all the "adaptation" funds, having been operational since 2002.
He also said Indonesia's tsunami buoy network had not been operational since 2012.
It has been operational since the early 1960's, when the 1,600‐mile‐an‐hour plane was first used by the Navy.
There is a growing network of video cameras positioned throughout the capital that feed into the Joint Operations Command Center, otherwise known as the JOCC, which has been operational since 9/11.
One difficulty is that the business has not been operational since Mr. Madoff's arrest in December and needs significant capital to restart.
Britain was in fact the record holder for the largest offshore wind farm even before the opening of London Array, which has been operational since April.
ViBES has been operational since 2004, and in 2008 16 healthcare services contributed data, including 10 metropolitan and 6 from regional Victoria.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com