Premier Mike Baird's plan to fund $20 billion worth of infrastructure promises via the sale of NSW electricity assets has hit a roadblock, with the Shooters and Fishers Party declaring it will never support the transaction.

Shooters and Fishers MP Robert Borsak told Fairfax Media the party will use its numbers in the NSW upper house to block legislation for the sale if it retains a share of the balance of power after the March 2015 election.

The Baird government has said poles and wires will go on the market if it is re-elected next year. Credit:Jeffrey Chan

Mr Borsak described Mr Baird's proposal to sell 49 per cent of electricity distribution businesses - the "poles and wires" - as "a big money grab" that would mean job cuts and the loss of billions of dollars in dividends to the state.

He said his party believed that if Mr Baird is allowed to sell 49 per cent, he will move to sell the remaining assets including Essential Energy, a regional provider which has been excluded from the transaction to secure the support of the Nationals.