India is one of the world's fastest growing economies and its energy consumption is projected to rise rapidly. According to Ministry of Petroleum and Natural Gas (MoP&NG) estimates, India has a total reserve of 763 million metric tons (MMT) of crude oil and 1.488 trillion cubic meters of natural gas. Currently, the country imports almost 77% of its crude oil needs and close to 50% of its natural gas needs, which has led the Government of India to set itself the goal of reducing these imports by at least 10%. .
It is believed that the Indian economy is currently on a healthy growth path and this will increase energy consumption in the country in the future. This increase in consumption is expected to be complemented by a disruption in India's primary energy mix due to the substitution of natural gas for oil. The share of natural gas in India's energy mix is expected to rise to 20% by 2025, up from 11% in 2010
The introduction of CNG in buses in Delhi and other Indian cities was motivated by the potential environmental and health benefits offered by CNG, by reducing emissions of critical air pollutants in relation to the conventional diesel it replaces. CNG, when used in optimized engines, significantly reduces emissions of fine particles, which are strongly correlated with health outcomes, including respiratory and cardiovascular diseases and deaths, and of other air pollutants such as carbon monoxide, sulfur and non-methane hydrocarbons.
The average prices of CNG and diesel for the period 2011-2015 reported in Delhi have been used by the Government of India to establish regulations for the promotion of CNG as a fuel for all mobility in the country, since Delhi has an important market and considerable for both fuels, and in order to assess all cases on a uniform basis in terms of fuel price