The phrase "a separate authority" is correct and usable in written English.
It can be used when referring to an entity or organization that has its own distinct power or control, independent from another authority.
Example: "In this case, the decision must be made by a separate authority to ensure impartiality."
Alternatives: "an independent body" or "a distinct entity".
In 2004 the Royal Parks Constabulary (once a separate authority that operated solely within the city's parks and gardens) merged with the Metropolitan Police.
NATO now seems likely to provide "command and control" functions, but with a separate authority running the operation, which includes Arab and other non-NATO countries.
As the responsibility for nurturing bilateral relations shifts to the State Department, the responsibility for security assistance moves to the C.I.A., which operates in Iraq under a separate authority, independent of the military.
A high-ranking Interior Ministry official was quoted in the report as saying that these brigades and counterterrorism groups "create confusion and a dangerous atmosphere where special units who have a separate authority storm in and take people".
"The prosecutor now claims a separate authority which can defeat the orders of the court, and which thereby involves a profound, unacceptable and unjustified intrusion into the role of the judiciary". Even if the prosecutor's appeal is successful, he faces a fine or suspension for non-compliance with the court's orders.
This closes what could have been an open door for the NSA to continue its current operations, but under a separate authority structure.
Leaked American diplomatic cables last year portrayed a Panamanian vice president's warning that the canal expansion was "a disaster" in the making and Mr. Martinelli's lamenting that the canal authority, a separate agency from the government, may have chosen a primary bidder because his cousin runs it.
The geographic county encompasses these areas and the city of Nottingham, administratively a separate unitary authority.
In addressing other recommendations made by the Columbia Accident Investigation Board, Mr. O'Keefe said that rather than creating a separate engineering authority to oversee space flight safety he preferred using organizations within NASA or already existing outside groups.
In the meantime, in sharp contrast to Mr. Sharon's resolute leadership, Mahmoud Abbas, the Palestinian leader, shows great weakness by appeasing terrorist groups intent on creating a separate Palestinian authority.
Each is managed by a separate park authority that wields considerable power in pursuit of its two statutory objectives: "to conserve and enhance the natural beauty, wildlife and cultural heritage of the area" and "to promote opportunities for the understanding and enjoyment of the special qualities of national parks by the public".
