Enel SpA, Italy’s biggest utility, filed a request today with the Italian Stock exchange for the initial public offering of shares in its Enel Green Power unit as soon as October.

Enel Green Power manages wind, solar, biomass, hydroelectric and geothermal power generation in 17 nations in Europe and the Americas. The IPO is the centerpiece of Enel’s plans to sell 7 billion euros ($8.6 billion) of assets to reduce debt to 45 billion euros this year from 51 billion euros.

Enel expects to raise about 4 billion euros in the share sale, Enel Chief Executive Officer Fulvio Conti said April 9.