The sale is the result of a competitive bidding process conducted by the UBS Investment Bank.
Infigen managing director Miles George said: "Infigen has been assessing various options to improve the capital structure of our business and unlock security holder value for quite some time."
The company, which owns an equity interest of 1,089MW in 18 wind energy facilities, plans to use the proceeds from the transaction to offload its debt.
Subject to customary conditions and regulatory approvals, the deal is planned to be completed by October. All the employees of Infigen will be moved to Primary Wind Power.
Infigen has categorized its US operations as a discontinued operation, and written down the book value of around $225m for the business.
"The outlook for our remaining Australian business is positive following the recent passage of the amended renewable energy target legislation in Australia that provides policy certainty.
"The amended target requires a near doubling of large-scale renewable energy capacity in the next five years, creating opportunities for profitable growth in the industry," George added.
