Yes it is.
Coal, petroleum, nuclear energy.
Petroleum, natural gas, and coal
Petroleum (oil) natural gas and coal
the main sources of power used in pakistan are petroleum oilfields oil refineries natural gas electricity hydroelectricity thermal power nuclear power coal
coal, oil, gas, gold, petroleum and iron
Petroleum (oil) natural gas and coal
About 80% of the energy consumed in the United States comes from burning petroleum, natural gas, and coal, with petroleum being the largest contributor followed by natural gas and then coal. Renewable energy sources like wind and solar are steadily increasing their share of the energy mix.
A= The three main sources are coal, petroleum and natural gas. Source - Wikipedia HOPE THIS HELPED!
Conventional energy sources are energy sources that are considered normal to use. For example, coal, nuclear, geothermal, hydroelectricity, and natural gas are sources of conventional energy. Non-conventional energy would include something completely weird and disliked, like burning corpses or puppies for energy.
Fossil fuels, such as coal, oil, and natural gas, are non-renewable sources of energy. Once they are extracted and burned, they cannot be replaced on a human timescale.
Electicity from coal, oil, natural gas, nuclear, biomass, wind, solar, tidal sources.
Much of the energy we use nowadays (as of 2016) is from the so-called non-renewable sources - mainly coal, and petroleum.