Australia's second largest power retailer AGL Energy says the end of the carbon tax will hurt this year's profit by nearly $200 million.
The nation's largest utilities company Origin Energy also acknowledged the tax's repeal on Thursday, but preferred to highlight the savings for households through lower electricity and gas bills and did not mention an earnings impact.
AGL said the removal of the carbon tax by parliament was expected to reduce fiscal 2015 earnings before interest and tax by a gross $186 million.
That included the removal of $100 million in transitional assistance arrangements in relation to the operations of its brown coal Loy Yang power station.
Another $86 million would be lost from its renewable energy and gas generation portfolios due to the anticipated fall in wholesale electricity prices.
However the carbon tax's demise and a potential reduction in the Renewable Energy Target would have a positive impact on Loy Yang's long term value, it said.
The company's shares had fallen 52.5 cents, or 3.33 per cent, to $15.255 by 1355 AEST while Origin Energy's stock was two cents lower at $14.36.
Origin welcomed the repeal and said it would update its billing systems for its 4.3 million customers to exclude the carbon price from usage charges.
Initial modelling estimated savings of about seven per cent for electricity and five per cent for gas, the company said.
"Origin customers will start seeing the new prices on their household energy bills from September, and these will be backdated to July 1," Origin's energy markets chief executive Frank Calabria said.
AGL said its fiscal 2014 underlying net profit due to be announced next month was expected to be in line with market consensus of $561 million.
After days of debate and stalling tactics, the Senate on Thursday voted 39 to 32 to unwind the carbon pricing scheme introduced by Labor in 2012.
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