"FMA, Mighty River Power and the Crown worked constructively to ensure that the key information, including particularly the investment statement and principal risks, was presented clearly," he said.
State-owned Enterprises Minister Tony Ryall welcomed the FMA's announcement and said it was important that potential investors took time to read the offer document.
"We know that for many New Zealanders, this may be the first time they have thought about buying shares, and great care has been taken to ensure the offer document sets out all of the information they need to know about the company to decide whether to buy shares in it," Ryall said.
The Mighty River Power share offer opens to the public this coming Monday April 15 and New Zealanders will have three weeks to apply for shares.
The offer closes on Friday May 3 and the company is expected to list on the NZX one week later.
About 440,000 people have pre-registered their interest in buying shares but it is yet to be seen how many of those will convert to actually making a purchase.
The Government has set a price range of $2.35 to $2.80 per share and has included a loyalty bonus scheme for the offer.
When the stock lists on the NZX on May 10, it is expected to have a market capitalisation of $3.29b -$3.92 billion, making it the fourth or fifth largest company on the exchange.
The FMA has published a list of Frequently Asked Questions for potential retail investors on the Mighty River Power share offer.