The company had hoped to raise up to 66.6 million lei (EUR15.1million) on OPCOM.
The electricity was to be delivered between October 1, 2014 and December 31, 2015.
In 2013, Romgaz obtained revenue of around RON237.4 million from selling electricity.
Romgaz, which is 70%-owned by the Romanian Energy Department, reported 82.8% increase in its first-quarter net profit to RON608.4 million, fueled by higher sales. (EUR1=RON4.3888)