America is swimming in natural gas -- we are a net exporter. Natural gas requires nearly no refinement, and is locally produced, so the additional energy required to make it available to customers is much smaller. It also produces less CO2 per unit of energy than most other fossil fuels, since it has a very high ratio of hydrogen to carbon. When it burns, you get 2 water molecules and 1 CO2, vs say decane where you get 11 water molecules and 10 CO2.