The low end of the range is roughly three times NextEra's prediction from March 2015, executives said during the company's first quarter 2016 earnings call.
For 2015-2016, the company expects to bring 4GW online, about 500MW above the midpoint of the range it publicised in March 2015.
John Ketchum, senior vice president, said: "2015 and 2016 [is] the most successful two-year period for renewables development in our history."
He cited the extension of the wind production tax credit and the solar investment tax credit in December as a major reason for the boom.
The company reported a net income of $636 million, or $1.37 per share, for Q1, compared with a net income of $650 million, or $1.45 per share, a year ago.
Florida-based NextEra has more than 12.4GW of wind projects online in North America.