The slump in oil prices has dragged down Z Energy's net profit by 93 percent.
Photo: RNZ
However, the petrol station company's operating profit for the year to the end of March is $241 million - ten percent higher than this time last year.
The company said it had experienced the most competitive year in its history and the most variable operating environment in 20 years.
The Automobile Association says diesel prices should be going down, not rising along with petrol. Audio
Clean energy schemes are not doing nearly enough to ward off climate change, the International Energy Agency says.
Petrol companies appear to be responding more quickly to oil price changes, an economist says, but the AA says the size of price drops also matters. Audio
The Labour Party is calling for a parliamentary select committee inquiry into the prices petrol companies charge.
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