Privatising WA's poles and wires utility Western Power would be a mistake that would cost the state $550 million a year and threaten electricity supply, says state Labor leader Mark McGowan.

The Labor opposition ramped up its campaign against the privatisation last week – holding media events every day, including launching a public petition and visiting at a transformer manufacturing business whose contract with Western Power had been axed, costing 80 jobs. The Liberal National government’s Treasurer Mike Nahan wants to…