Coal - a fossil fuel - is the most important energy source for electricity generation and also forms an essential fuel for the production of steel and cement. A negative characteristic of coal, however, is that it can be labelled as the most polluting energy source due to its high proportion of carbon. Other vital energy sources, such as natural gas, are less polluting but significantly more exhaustive and more susceptible to price fluctuations on the world market. Therefore, the world's industries have increasingly shifted their focus to coal.
The main export destination countries for Indonesian coal are China, India, Japan and Korea. Coal has a clear importance for Indonesia's state revenue as the commodity accounts for around 85 percent of mining revenue.
So, coal industry have attract to foreign investor for invest or join venture in Vietnam because coal is necessary for global market and then they will do business successful and get more benefits.