The California-based company owns and operates eight wind power projects in the United States, Canada and Chile with a total generating capacity of 1,041 MW.
It offered 16 million shares, and expects to raise around $318.6 million in net proceeds.
Pattern priced the shares in its initial public offering, the first for a US wind energy company, at $22, above the $19-21 range initially expected. The stock opened at $24.10 and touched a high of $24.30 during the day.
The company is trading on the NASDAQ Global Market and Toronto Stock Exchange under the ticker symbols PEGI and PEG respectively.