The news was announced by Gazprom, which holds a 50 percent stake in Sakhalin Energy.
Gazprom's share in the company's net profit in January-June 2010 stood at 18.992 billion rubles against a loss of 3.27 billion rubles the previous year.
Sakhalin Energy's first half revenues grew five-fold year-on-year to 150.006 billion rubles.
The other shareholders in the company include Royal Dutch/Shell with 27.5 percent, and Japan's Mitsui and Mitsubishi with 12.5 percent and 10 percent respectively.
