Mighty River Power, a state-owned power company in New Zealand, has announced a 27 per cent year-on-year rise in its electricity production in the second quarter of 2011.

But a combination of strong competition, the Christchurch earthquake, and unseasonably warm weather triggered a fall in sales, said the firm.

For the quarter to 30 June Mighty River’s production climbed to 1785 GWh, up from 1401 GWh in the same period last year. Hydro generation expanded 58 per cent to 1190 GWh in the quarter, while geothermal output rose to 562 GWh from 552 GWh.

Yet sales to residential and commercial customers slipped by 5 per cent to 1710 GWh while Mighty River’s customer base shrank to 392,000 from 412,000.

Lower spot prices for electricity also meant gas fired cogeneration dropped by 65 percent to 33 GWh, cutting Mighty River’s carbon emissions by 22 per cent from the same period in 2010.

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