The regulator Ofgem, sets the amount of cash given to National Grid to maintain and improve the country's gas and electricity networks.
It said the review was needed to establish whether certain energy transmission projects were still needed and required funding.
"Following our consultation in November, Ofgem has today decided to launch a mid-period review into the 2013-2021 price controls which will be limited to National Grid Electricity Transmission and National Grid Gas Transmission," Ofgem said on Thursday.
Ofgem said since the review was targeted to a few projects it would not be re-opening the whole price control package.
"Ofgem's mid-period review announcement this morning should not concern investors, as it is focussed on reviewing 3 specific projects in Transmission," analysts at Bernsteil said in a research note.
"It is not a re-opening of the price control to change crucial aspects such as the allowed cost of capital," they added.
Gas and electricity network operator National Grid made 2.9 billion pounds $4.5 billion in pretax profit in the financial year ending March 31 2015.