The phrase "extensive power over" is correct and can be used in written English.
This phrase is generally used to describe someone or something with a great amount of control over something else. For example: The mayor had extensive power over the city's budget and decision-making process.
In Hungary, Mr Orban pushed through a law in 2010 which restricts independent media and gives the government extensive power over the flow of information.
If they succeed, then Mr Erdogan will be able to expand his already extensive power over the state, security forces, media and judiciary.
At issue is the role of a Pentagon office called the "convening authority," which oversees the military prosecutors and has extensive power over the defense lawyers and judges in the cases against Guantánamo detainees.
The charter gave the gentry extensive power over its serfs; the nobles gained judicial authority over all crimes committed by serfs except robbery and murder and were empowered to sentence a serf to penal servitude in Siberia and also to recall him.
There is near universal agreement that the text originates from Mercia, partly because the kings of Mercia are known to have held extensive power over other Anglo-Saxon territories from the late 7th to the early 9th centuries, but also because the list, headed by Mercia, is almost exclusively of peoples who lived south of the river Humber.
The matter may end up before the California Coastal Commission, a state panel with extensive powers over beach use and access that is not always friendly to municipal governments.
Within that band, coastal states have extensive powers over foreign shipping and absolute rights over fish and seabed resources such as oil and gas.
The London Philharmonic countered with a record of proven commercial success and the prospect of a new music director with extensive powers over personnel and artistic policy.
With extensive powers over antitrust policy, trade, agriculture and several other fields, the European Commission is an important regulator in some areas, and it has the right to propose legislation in many others.
The call came after evidence emerged that raised doubts about the benefits of community treatment orders (CTOs), which give doctors and social workers extensive powers over the lives of patients repeatedly taken into hospital.
