Official claims that NSW would be $300 billion better off if the state's electricity assets are privatised should be independently tested, amid "some disconnect" between statements the Baird government has provided the public, a parliamentary inquiry says.

But Christian Democratic MP the Reverend Fred Nile, upon whom the government is reliant to pass its centrepiece re-election policy, says he is convinced the proposal is economically sound despite outstanding questions over its fiscal benefits.

The Reverend Fred Nile is convinced the proposal to privatise NSW's electricity assets is economically sound. Credit:Daniel Munoz

Mr Nile on Tuesday announced the results of a parliamentary inquiry into the proposed part-lease of the state's "poles and wires", which the government says will create $20 billion to be spent on infrastructure.

The government says the investment will bring a $300 billion boost to the state's economy by 2035, by driving growth and tax revenue. The forecast was based on a government-commissioned report by Deloitte Access Economics.