Bangladesh is the seventh-largest natural gas producer in Asia, ahead of neighbouring Myanmar, and 56 percent of the country's electricity is generated by natural gas. Major gas fields are located in the northeastern (particularly Sylhet) and southern (including Barisal and Chittagong) regions. Petrobangla is the national energy company. The American multinational corporation Chevron produces 50 percent of Bangladesh's natural gas. According to geologists, the Bay of Bengal contains large, untapped gas reserves in Bangladesh's exclusive economic zone. Bangladesh has substantial coal reserves, with several coal mines operating in the northwest.