"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," FMA head Sean Hughes said.
State-owned Enterprises Minister Tony Ryall welcomed the FMA's announcement and said potential investors should take 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 share offer opens to the public on Monday 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 a week later.
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 $3.29-$3.92 billion, making it the fourth or fifth largest company on the exchange.