By William Horobin

PARIS--Power utility Engie (ENGI.FR) trimmed its profit outlook for this year as it postponed by two months to January 2016 the reopening of two Belgian nuclear reactors that have been shut since March 2014.

Engie lowered its target for net recurring income--a measure of net income that strips out restructuring costs and other impairments--by 100 million euros ($111.8 million) to a range of between EUR2.75 billion and EUR3.05 billion.

The power company, formerly known as GDF Suez, has repeatedly been forced to postpone the reopening of the Doel 3 and Tihange 2 reactors after Belgian authorities found "unexpected results" in March last year when testing the pressure vessels at the plants.

The delays in reopening the plants already hurt the company's 2014 bottom line. It estimates that every additional month of closure costs EUR40 million in net recurring income.

The company's shares opened lower on the news. At 0730 GMT Engie shares traded -0.2% at EUR14.41, the only stock in the red on France's CAC-40, which was up 1.4% at 4519.48.

-Write to William Horobin at william.horobin@wsj.com

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(END) Dow Jones Newswires

October 01, 2015 03:57 ET (07:57 GMT)