In updated guidance it says full year pre-tax earnings will be the range of $480 million to $500 million, reflecting lower-than-average rainfall in its Waikato River catchment.
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The company's exit from geothermal development in Chile and Germany resulted in non-cash impairments ($83 million) along with the favourable fair value movements of $20 million recognised in the previous half year.
"As announced in December, following a rigorous review, we decided to exit international geothermal development options. The accounting implications of that is a key factor flowing through to the financial results for the period," said chairwoman Joan Withers.
Mighty River Power maintained strong cash flows through the interim period - supporting the forecast ordinary dividend of 14 cents for the full year and today declared a fully imputed interim dividend of 5.6 cents per share, to be paid on March 31.
MRP shares last traded at $3.37.
Contact Energy last week announced it was investigating overseas geothermal ventures to spend an estimated $1 billion in surplus cash over the next five years.