Contact Energy said first-half operating earnings fell 21 per cent amid tight gas supplies and reduced sales volumes to the firm's commercial and industrial customers.
Earnings before interest, tax, depreciation, amortisation and changes in financial instruments fell to $221 million in the six months ended December 31, from $278 million a year earlier on a continuing operations basis, as low lake levels reduced hydro generation and gas shortages increased fuel costs.
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Earnings from the generation business fell to $204 million, down $39 million from a year earlier. Earnings from the customer business were $18 million lower at $30 million as increased electricity, gas, carbon and network costs were not recovered.
"The impact of the recent under-investment in New Zealand's ageing gas fields has been acutely felt over the past six months with the supply of natural gas proving unreliable, leading to thermal input costs increasing sharply," chief executive Dennis Barnes said in a statement.