Of the stake not held by the Government, the average holding is 6560 shares, meaning those shareholders will get a full-year dividend of about $885.
The company yesterday reported a full-year profit of $212 million, up from $115 million last year when it was hit by the cost of taking direct control of its investment in international geothermal operations.
MRP said it achieved a $20 million permanent reduction in operating expenditure, after retiming of maintenance and helped by the conclusion of major power station building work.
It suffered from the worst hydrological conditions in its Waikato hydro catchment but said earnings were boosted by production from its geothermal power stations - which make up about 42 per cent of MRP's generation. It was able to reduce sales to commercial and industrial customers when wholesale electricity prices had been low.
Operating earnings (ebitdaf) grew 29 per cent to $504 million.
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After stripping out the impact of significant impairments from taking direct control of international geothermal investments in Chile and the United States, underlying earnings were up 3 per cent or $5 million.
Chairwoman Joan Withers said generation from low cash cost renewables provided the foundation for delivering above the IPO forecasts.
Chief executive Doug Heffernan said the company's differentiated retail electricity brands performed well as competition continued to intensify across all residential and business segments.
The company expected earnings in the 2015 financial year to be in the range of $495 million to $520 million - subject to any adverse events, significant one-off expenses or other unforeseeable circumstances.
Shares listed at $2.50 last year and yesterday closed down 0.5c at $2.37c.
Dividend dates
Ex-dividend September 1: Investors must own or have bought shares before the ex-dividend date.
Record date September 3: Investors who own shares as at the ex-dividend date will appear on MRP register.
Payment date September 30: All eligible shareholders will be paid their final dividend by cheque or into their bank account.
See Mighty River's latest financial results presentation here: