Its nine-month sales fell 10.8%, to RON2.93 billion, the company said in its earnings report.
In the third quarter alone, Romgaz reported a 14% drop in net profit compared with the same quarter last year, to RON208.7 million.
The company cut back on investments and lowered its production to cope with reduced demand.
Romgaz produced 4.13 billion cubic meters of natural gas during the first nine months, 2.21% less than in the same period last year.