Primeline Energy Holdings Inc. engages in the exploration, development, and production of offshore oil and gas properties in the People's Republic of China. It has 100% contractor's interest in the petroleum contract with China National Offshore Oil Corporation for Block 33/07 that covers an area of 4,397 square kilometers; and 49% interest in the producing LS36-1 gas field in Block 25/34 that covers an area of 84.7 square kilometers in the East China Sea. The company was founded in 1993 and is based in Hong Kong, Hong Kong.