City gas distribution (CGD) involves supplying natural gas to retail customers through pipelines and compressed natural gas stations. CGD began in India in 1880 but expanded significantly after 1998 when the Supreme Court mandated converting Delhi vehicles to CNG. The Petroleum and Natural Gas Regulatory Board regulates CGD and authorizes operators but was ruled to not have power until section 16 of its act was notified in 2010. CGD has now spread to several states and over 300 geographical areas present opportunities for investment in gas infrastructure.