WA businesses could be hit by up to $22 billion in extra costs as a result of Labor’s plan to reduce carbon emissions by 45 per cent.

The Coalition will today release modelling that shows 50 businesses across WA could be hit with extra costs of between $11 billion and $22 billion through to 2030 — the highest in the country.

Nationally, the overall hit would be more than $29 billion and possibly up to $56 billion.

Energy Minister Angus Taylor said the cost would have an impact on Australian families and jobs.

“Labor’s carbon hit will come as a major shock to 50 WA firms with tens of thousands of employees,” Mr Taylor said.

“These costs will inevitably feed through to family budgets — higher costs on food (dairy products, beef, lamb and chicken), public transport, council rates, building materials and airline travel.”

Under Labor’s Climate Plan, a Shorten government would require 250 Australian firms to reduce their non-electricity (Scope 1) carbon emissions by at least 45 per cent by 2030. Firms that fail to meet the targets would be required to purchase domestic or international carbon credits.

The Coalition said Labor’s climate plan changed the purpose and impact of the safeguard mechanism which resulted in the cost impact.

The mechanism was first implemented in 2016 by the Coalition as a way to require Australia’s largest emitters to keep emissions within baseline levels.

The Coalition modelled Labor’s proposed changes on two cost estimates — a carbon price at $35 in 2020, rising in equal increments to $62 by 2030.

The second figures were based on a $US40 and $US80 per tonne price in 2020, rising to between $US50 and $US100 by 2030 — based on a Report of the High-Level Commission on Global Carbon Prices chaired by Nobel Prize-winning economist Joe Stiglitz and British economist Lord Nicholas Stern.

Some of the biggest-hit companies operating in WA would be Chevron Australia ($1.66 billion), Woodside ($1.38 billion) and Rio Tinto ($1.13 billion), Alcoa ($867.82 million) and BHP ($473.64 million).

Labor disputed the costs and climate spokesman Mark Butler said they were “weird, wacky and wrong”.

He did not accept there would be job losses through the party’s climate policies.

Speaking in Perth, where he met Woodside chief executive Peter Coleman, Mr Butler said industry had made it clear what it wanted from an emissions policy. “The first was to stick with the safeguard mechanism, not construct a new emissions trading scheme,” he said.